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    <link:label id="lab_us-gaap_UnfavorableRegulatoryActionMember_CAD453C668127A9BD7F73594FA021884_terseLabel_en-US" xlink:label="lab_us-gaap_UnfavorableRegulatoryActionMember_CAD453C668127A9BD7F73594FA021884" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unfavorable Regulatory Action [Member]</link:label>
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    <link:label id="lab_lii_Totalexpenseduetonaturaldisaster_32DF64DB3D2DB9B39CCB3594FA0370A6_terseLabel_en-US" xlink:label="lab_lii_Totalexpenseduetonaturaldisaster_32DF64DB3D2DB9B39CCB3594FA0370A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total expense due to natural disaster</link:label>
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    <link:label id="lab_lii_OperatingLeaseTerm_8FB1D9B4C689E17067D03594FA047FA4_verboseLabel_en-US" xlink:label="lab_lii_OperatingLeaseTerm_8FB1D9B4C689E17067D03594FA047FA4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of years of lease of corporate headquarters</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_OperatingLeaseTerm" xlink:label="loc_lii_OperatingLeaseTerm_8FB1D9B4C689E17067D03594FA047FA4" xlink:type="locator" />
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    <link:label id="lab_lii_AreaOfLeasedOfficeBuilding_D5527A9EDEAC319897F33594FA043F89_terseLabel_en-US" xlink:label="lab_lii_AreaOfLeasedOfficeBuilding_D5527A9EDEAC319897F33594FA043F89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Area of leased office building (in square feet)</link:label>
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    <link:label id="lab_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_F5928A54166E2FFA310B3594FA0409B4_verboseLabel_en-US" xlink:label="lab_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_F5928A54166E2FFA310B3594FA0409B4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Purchase price of property at end of lease term</link:label>
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    <link:label id="lab_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_AE5351B69A8814FE607B3594FA041E4B_verboseLabel_en-US" xlink:label="lab_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_AE5351B69A8814FE607B3594FA041E4B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Percentage of lease balance as final payment end of lease term</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm" xlink:label="loc_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_AE5351B69A8814FE607B3594FA041E4B" xlink:type="locator" />
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    <link:label id="lab_lii_DebtinstrumentCovenantfordebtnotpaid_8C7FE783495A06A6CE3B3594FA041B13_terseLabel_en-US" xlink:label="lab_lii_DebtinstrumentCovenantfordebtnotpaid_8C7FE783495A06A6CE3B3594FA041B13" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt covenant, debt not paid when due</link:label>
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    <link:label id="lab_us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetIncurredLoss1_BD6CEFB20239DC5469483594FA05AD68_verboseLabel_en-US" xlink:label="lab_us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetIncurredLoss1_BD6CEFB20239DC5469483594FA05AD68" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Expense for known and future asbestos-related litigation</link:label>
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    <link:label id="lab_lii_LossContingencyAllegedUnauthorizedPayment_EC7CB2933F7CC43E1F423594FA05F7FE_terseLabel_en-US" xlink:label="lab_lii_LossContingencyAllegedUnauthorizedPayment_EC7CB2933F7CC43E1F423594FA05F7FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loss Contingency, Alleged Unauthorized Payment</link:label>
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    <link:label id="lab_lii_LossContingencyAllegedUnauthorizedPayment_EC7CB2933F7CC43E1F423594FA05F7FE_documentation_en-US" xlink:label="lab_lii_LossContingencyAllegedUnauthorizedPayment_EC7CB2933F7CC43E1F423594FA05F7FE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Loss Contingency, Alleged Unauthorized Payment</link:label>
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    <link:label id="lab_lii_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsGrantsinPeriodWeightedAverageGrantDateFairValue_D27B4F064B3F6120F9A03C273C94F3C2_verboseLabel_en-US" xlink:label="lab_lii_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsGrantsinPeriodWeightedAverageGrantDateFairValue_D27B4F064B3F6120F9A03C273C94F3C2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average fair value of grants, per share (in usd per share)</link:label>
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    <link:label id="lab_lii_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsGrantsinPeriodWeightedAverageGrantDateFairValue_D27B4F064B3F6120F9A03C273C94F3C2_documentation_en-US" xlink:label="lab_lii_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsGrantsinPeriodWeightedAverageGrantDateFairValue_D27B4F064B3F6120F9A03C273C94F3C2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Grants in Period, Weighted Average Grant Date Fair Value</link:label>
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    <link:label id="lab_us-gaap_LeaseCostTableTextBlock_DFF8215BD966EF7A5A793C42B49A354B_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_DFF8215BD966EF7A5A793C42B49A354B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of lease expense</link:label>
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    <link:label id="lab_srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock_C3C79B2D522ABADCCACF3C42B49ABB26_terseLabel_en-US" xlink:label="lab_srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock_C3C79B2D522ABADCCACF3C42B49ABB26" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of approximate minimum commitments under all non-cancelable leases outstanding</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfEnvironmentalLossContingenciesBySiteTextBlock_6D38A9896CBE7DF0921D3C42B49A9ABB_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEnvironmentalLossContingenciesBySiteTextBlock_6D38A9896CBE7DF0921D3C42B49A9ABB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of information related to our environmental reserve</link:label>
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    <link:label id="lab_lii_IncreaseDecreaseinOperatingleaseassetandliabilitynet_3BC902F40286CC280F2A3C42B5F0F374_documentation_en-US" xlink:label="lab_lii_IncreaseDecreaseinOperatingleaseassetandliabilitynet_3BC902F40286CC280F2A3C42B5F0F374" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Operating lease asset and liability , net</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_EA4ECB4E3F73BFE351F43C42B5F0C200_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_EA4ECB4E3F73BFE351F43C42B5F0C200" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other, net</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_CB18C657A3587396A75B3C42B5F0320A_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_CB18C657A3587396A75B3C42B5F0320A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_CB18C657A3587396A75B3C42B5F0320A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_CB18C657A3587396A75B3C42B5F0320A" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_CB18C657A3587396A75B3C42B5F0320A" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7A8D293A3367C4A2F00D3C42B5F1E59C_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7A8D293A3367C4A2F00D3C42B5F1E59C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7A8D293A3367C4A2F00D3C42B5F1E59C_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7A8D293A3367C4A2F00D3C42B5F1E59C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7A8D293A3367C4A2F00D3C42B5F1E59C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7A8D293A3367C4A2F00D3C42B5F1E59C" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7A8D293A3367C4A2F00D3C42B5F1E59C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_29BB300CBC638F825E153C42B5F1D5E5_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_29BB300CBC638F825E153C42B5F1D5E5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from the disposal of property, plant and equipment</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_29BB300CBC638F825E153C42B5F1D5E5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AD76A4BC602312427D4C3C42B5F17B97_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AD76A4BC602312427D4C3C42B5F17B97" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of property, plant and equipment</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AD76A4BC602312427D4C3C42B5F17B97_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AD76A4BC602312427D4C3C42B5F17B97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AD76A4BC602312427D4C3C42B5F17B97" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AD76A4BC602312427D4C3C42B5F17B97" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AD76A4BC602312427D4C3C42B5F17B97" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquireShortTermInvestments_81102420721C843261153C42B5F103D6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireShortTermInvestments_81102420721C843261153C42B5F103D6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Purchases of short-term investments</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireShortTermInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_81102420721C843261153C42B5F103D6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_F5A9DF7A0EC5B84C5EBF3C42B5F2354F_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_F5A9DF7A0EC5B84C5EBF3C42B5F2354F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_09BDB5712D70D12502353C42B5F26312_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_09BDB5712D70D12502353C42B5F26312" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_09BDB5712D70D12502353C42B5F26312_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_09BDB5712D70D12502353C42B5F26312" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_09BDB5712D70D12502353C42B5F26312" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromOtherDebt_7555CB7ECA1DCAC098E23C42B5F26983_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromOtherDebt_7555CB7ECA1DCAC098E23C42B5F26983" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset securitization borrowings</link:label>
    <link:label id="lab_us-gaap_ProceedsFromOtherDebt_7555CB7ECA1DCAC098E23C42B5F26983_label_en-US" xlink:label="lab_us-gaap_ProceedsFromOtherDebt_7555CB7ECA1DCAC098E23C42B5F26983" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Other Debt</link:label>
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    <link:label id="lab_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_57D6295003FCBC04D5F0212FB3A52FD2_verboseLabel_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_57D6295003FCBC04D5F0212FB3A52FD2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">(Loss) income from discontinued operations before income taxes</link:label>
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    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_A404C703E2003E9E19B0212FB3A8B2E0_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_A404C703E2003E9E19B0212FB3A8B2E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Diluted [Abstract]</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_3BE3B288E24A7F2D886F3C42B1F83E1B_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_3BE3B288E24A7F2D886F3C42B1F83E1B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities:</link:label>
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    <link:label id="lab_lii_MaximumAmountAvailableUnderAssetSecuritization_ED76D74A415692E057D34A93CC717262_label_en-US" xlink:label="lab_lii_MaximumAmountAvailableUnderAssetSecuritization_ED76D74A415692E057D34A93CC717262" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Amount Available Under Asset Securitization</link:label>
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    <link:loc xlink:href="lii-20191231.xsd#lii_MaximumAmountAvailableUnderAssetSecuritization" xlink:label="loc_lii_MaximumAmountAvailableUnderAssetSecuritization_ED76D74A415692E057D34A93CC717262" xlink:type="locator" />
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    <link:label id="lab_lii_AmountAvailableUnderAssetSecuritization_255E98BC7CF870EBD4754A93CC7250CB_terseLabel_en-US" xlink:label="lab_lii_AmountAvailableUnderAssetSecuritization_255E98BC7CF870EBD4754A93CC7250CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount Available Under Asset Securitization</link:label>
    <link:label id="lab_lii_AmountAvailableUnderAssetSecuritization_255E98BC7CF870EBD4754A93CC7250CB_label_en-US" xlink:label="lab_lii_AmountAvailableUnderAssetSecuritization_255E98BC7CF870EBD4754A93CC7250CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amount Available Under Asset Securitization</link:label>
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    <link:loc xlink:href="lii-20191231.xsd#lii_AmountAvailableUnderAssetSecuritization" xlink:label="loc_lii_AmountAvailableUnderAssetSecuritization_255E98BC7CF870EBD4754A93CC7250CB" xlink:type="locator" />
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    <link:label id="lab_lii_MaximumSecuritizationAsPercentageOfNetPoolBalance_6814DC455B225DD79CBF4A93CC7205CD_verboseLabel_en-US" xlink:label="lab_lii_MaximumSecuritizationAsPercentageOfNetPoolBalance_6814DC455B225DD79CBF4A93CC7205CD" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Maximum securitization as percentage of net pool balance</link:label>
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    <link:label id="lab_lii_MaximumSecuritizationAsPercentageOfNetPoolBalance_6814DC455B225DD79CBF4A93CC7205CD_documentation_en-US" xlink:label="lab_lii_MaximumSecuritizationAsPercentageOfNetPoolBalance_6814DC455B225DD79CBF4A93CC7205CD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum securitization as percentage of net pool balance.</link:label>
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    <link:label id="lab_lii_ProgramFee_432DB41D825BAB9F1B294A93CC7209EA_documentation_en-US" xlink:label="lab_lii_ProgramFee_432DB41D825BAB9F1B294A93CC7209EA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Program fee.</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_ProgramFee" xlink:label="loc_lii_ProgramFee_432DB41D825BAB9F1B294A93CC7209EA" xlink:type="locator" />
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    <link:label id="lab_lii_AverageFloatingCommercialPaperRate_B3D1FF4E6FFE99A627EC4A93CC729B2C_verboseLabel_en-US" xlink:label="lab_lii_AverageFloatingCommercialPaperRate_B3D1FF4E6FFE99A627EC4A93CC729B2C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Average floating commercial paper rate (as a percent)</link:label>
    <link:label id="lab_lii_AverageFloatingCommercialPaperRate_B3D1FF4E6FFE99A627EC4A93CC729B2C_label_en-US" xlink:label="lab_lii_AverageFloatingCommercialPaperRate_B3D1FF4E6FFE99A627EC4A93CC729B2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average Floating Commercial Paper Rate</link:label>
    <link:label id="lab_lii_AverageFloatingCommercialPaperRate_B3D1FF4E6FFE99A627EC4A93CC729B2C_documentation_en-US" xlink:label="lab_lii_AverageFloatingCommercialPaperRate_B3D1FF4E6FFE99A627EC4A93CC729B2C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Average floating commercial paper rate.</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_AverageFloatingCommercialPaperRate" xlink:label="loc_lii_AverageFloatingCommercialPaperRate_B3D1FF4E6FFE99A627EC4A93CC729B2C" xlink:type="locator" />
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    <link:label id="lab_lii_PercentageOfMaximumAvailableAmountUsedToChargeUnusedFee_7925DE801C4BABE07BF34A93CC72B50B_verboseLabel_en-US" xlink:label="lab_lii_PercentageOfMaximumAvailableAmountUsedToChargeUnusedFee_7925DE801C4BABE07BF34A93CC72B50B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Unused fee (as a percent)</link:label>
    <link:label id="lab_lii_PercentageOfMaximumAvailableAmountUsedToChargeUnusedFee_7925DE801C4BABE07BF34A93CC72B50B_label_en-US" xlink:label="lab_lii_PercentageOfMaximumAvailableAmountUsedToChargeUnusedFee_7925DE801C4BABE07BF34A93CC72B50B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Maximum Available Amount Used To Charge Unused Fee</link:label>
    <link:label id="lab_lii_PercentageOfMaximumAvailableAmountUsedToChargeUnusedFee_7925DE801C4BABE07BF34A93CC72B50B_documentation_en-US" xlink:label="lab_lii_PercentageOfMaximumAvailableAmountUsedToChargeUnusedFee_7925DE801C4BABE07BF34A93CC72B50B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of maximum available amount used to charge unused fee.</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_PercentageOfMaximumAvailableAmountUsedToChargeUnusedFee" xlink:label="loc_lii_PercentageOfMaximumAvailableAmountUsedToChargeUnusedFee_7925DE801C4BABE07BF34A93CC72B50B" xlink:type="locator" />
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    <link:label id="lab_lii_FixedRateOfAgreement_DA4FB91D182A6BD546864A93CC73BF29_verboseLabel_en-US" xlink:label="lab_lii_FixedRateOfAgreement_DA4FB91D182A6BD546864A93CC73BF29" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Fixed rate of agreement (as a percent)</link:label>
    <link:label id="lab_lii_FixedRateOfAgreement_DA4FB91D182A6BD546864A93CC73BF29_label_en-US" xlink:label="lab_lii_FixedRateOfAgreement_DA4FB91D182A6BD546864A93CC73BF29" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fixed Rate Of Agreement</link:label>
    <link:label id="lab_lii_FixedRateOfAgreement_DA4FB91D182A6BD546864A93CC73BF29_documentation_en-US" xlink:label="lab_lii_FixedRateOfAgreement_DA4FB91D182A6BD546864A93CC73BF29" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fixed rate of agreement.</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_FixedRateOfAgreement" xlink:label="loc_lii_FixedRateOfAgreement_DA4FB91D182A6BD546864A93CC73BF29" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_56806123B478CE9D43DB9B73B9269DF5_verboseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_9488656B1BEC5E5C800608A907B94039" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Excess tax benefits from stock-based compensation</link:label>
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    <link:label id="lab_us-gaap_ContractWithCustomerAssetNet_AC8FD7624AF0FBA9C7843C42B580CC18_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetNet_AC8FD7624AF0FBA9C7843C42B580CC18" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract with Customer, Asset, after Allowance for Credit Loss</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerAssetNet_AC8FD7624AF0FBA9C7843C42B580CC18_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetNet_AC8FD7624AF0FBA9C7843C42B580CC18" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Asset, after Allowance for Credit Loss</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetNet" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_AC8FD7624AF0FBA9C7843C42B580CC18" xlink:type="locator" />
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    <link:loc xlink:href="lii-20191231.xsd#lii_ContractwithCustomerAssetCumulativeCatchupAdjustmenttoRevenueChangeinMeasureofProgressPercent" xlink:label="loc_lii_ContractwithCustomerAssetCumulativeCatchupAdjustmenttoRevenueChangeinMeasureofProgressPercent_4F408269D4F6E99472A73C42B5801011" xlink:type="locator" />
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    <link:label id="lab_lii_Transferofpensionplanassettolifeinsurancecompany_8A671C8B9DCC7163DF755171A5E15226_terseLabel_en-US" xlink:label="lab_lii_Transferofpensionplanassettolifeinsurancecompany_8A671C8B9DCC7163DF755171A5E15226" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transfer of pension plan asset to life insurance company</link:label>
    <link:label id="lab_lii_Transferofpensionplanassettolifeinsurancecompany_8A671C8B9DCC7163DF755171A5E15226_label_en-US" xlink:label="lab_lii_Transferofpensionplanassettolifeinsurancecompany_8A671C8B9DCC7163DF755171A5E15226" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transfer of pension plan asset to life insurance company</link:label>
    <link:label id="lab_lii_Transferofpensionplanassettolifeinsurancecompany_8A671C8B9DCC7163DF755171A5E15226_documentation_en-US" xlink:label="lab_lii_Transferofpensionplanassettolifeinsurancecompany_8A671C8B9DCC7163DF755171A5E15226" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Transfer of pension plan asset to life insurance company</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_Transferofpensionplanassettolifeinsurancecompany" xlink:label="loc_lii_Transferofpensionplanassettolifeinsurancecompany_8A671C8B9DCC7163DF755171A5E15226" xlink:type="locator" />
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    <link:label id="lab_lii_PercentageOfMedicalCoverageCostPayableByParticipants_DFA560BAF732E18B2AB25171A5E1761C_terseLabel_en-US" xlink:label="lab_lii_PercentageOfMedicalCoverageCostPayableByParticipants_DFA560BAF732E18B2AB25171A5E1761C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of medical coverage cost payable by participants</link:label>
    <link:label id="lab_lii_PercentageOfMedicalCoverageCostPayableByParticipants_DFA560BAF732E18B2AB25171A5E1761C_label_en-US" xlink:label="lab_lii_PercentageOfMedicalCoverageCostPayableByParticipants_DFA560BAF732E18B2AB25171A5E1761C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Medical Coverage Cost Payable by Participants</link:label>
    <link:label id="lab_lii_PercentageOfMedicalCoverageCostPayableByParticipants_DFA560BAF732E18B2AB25171A5E1761C_documentation_en-US" xlink:label="lab_lii_PercentageOfMedicalCoverageCostPayableByParticipants_DFA560BAF732E18B2AB25171A5E1761C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of Medical Coverage Cost Payable by Participants</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_PercentageOfMedicalCoverageCostPayableByParticipants" xlink:label="loc_lii_PercentageOfMedicalCoverageCostPayableByParticipants_DFA560BAF732E18B2AB25171A5E1761C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_21CA300176796DCE3C1B5171A5E1685E_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_21CA300176796DCE3C1B5171A5E1685E" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Decrease in projected benefit obligation</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_21CA300176796DCE3C1B5171A5E1685E_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_21CA300176796DCE3C1B5171A5E1685E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations" xlink:label="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_21CA300176796DCE3C1B5171A5E1685E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_21CA300176796DCE3C1B5171A5E1685E" xlink:to="lab_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_21CA300176796DCE3C1B5171A5E1685E" xlink:type="arc" />
    <link:label id="lab_lii_PercentageOfProjectedBenefitObligationByPensionPlans_4975CBFC50FE13A2AD455171A5E20225_verboseLabel_en-US" xlink:label="lab_lii_PercentageOfProjectedBenefitObligationByPensionPlans_4975CBFC50FE13A2AD455171A5E20225" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Projected benefit obligation (as a percent)</link:label>
    <link:label id="lab_lii_PercentageOfProjectedBenefitObligationByPensionPlans_4975CBFC50FE13A2AD455171A5E20225_label_en-US" xlink:label="lab_lii_PercentageOfProjectedBenefitObligationByPensionPlans_4975CBFC50FE13A2AD455171A5E20225" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Projected Benefit Obligation By Pension Plans</link:label>
    <link:label id="lab_lii_PercentageOfProjectedBenefitObligationByPensionPlans_4975CBFC50FE13A2AD455171A5E20225_documentation_en-US" xlink:label="lab_lii_PercentageOfProjectedBenefitObligationByPensionPlans_4975CBFC50FE13A2AD455171A5E20225" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of Projected Benefit Obligation by Pension Plans.</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_PercentageOfProjectedBenefitObligationByPensionPlans" xlink:label="loc_lii_PercentageOfProjectedBenefitObligationByPensionPlans_4975CBFC50FE13A2AD455171A5E20225" xlink:type="locator" />
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    <link:label id="lab_lii_PercentageOfFairValueOfPlanAssetsByPensionPlans_4B5A9093877563CB17D95171A5E2DA25_terseLabel_en-US" xlink:label="lab_lii_PercentageOfFairValueOfPlanAssetsByPensionPlans_4B5A9093877563CB17D95171A5E2DA25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan assets (as a percent)</link:label>
    <link:label id="lab_lii_PercentageOfFairValueOfPlanAssetsByPensionPlans_4B5A9093877563CB17D95171A5E2DA25_label_en-US" xlink:label="lab_lii_PercentageOfFairValueOfPlanAssetsByPensionPlans_4B5A9093877563CB17D95171A5E2DA25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Fair Value Of Plan Assets By Pension Plans</link:label>
    <link:label id="lab_lii_PercentageOfFairValueOfPlanAssetsByPensionPlans_4B5A9093877563CB17D95171A5E2DA25_documentation_en-US" xlink:label="lab_lii_PercentageOfFairValueOfPlanAssetsByPensionPlans_4B5A9093877563CB17D95171A5E2DA25" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of Fair Value of Plan Assets by Pension Plans.</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_PercentageOfFairValueOfPlanAssetsByPensionPlans" xlink:label="loc_lii_PercentageOfFairValueOfPlanAssetsByPensionPlans_4B5A9093877563CB17D95171A5E2DA25" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_116675A87FDB86ED1B285171A5E2941D_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_116675A87FDB86ED1B285171A5E2941D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Estimated prior service (cost) credits</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_116675A87FDB86ED1B285171A5E2941D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_45BC71735F3590B80C865171A5E256CA_negatedLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_45BC71735F3590B80C865171A5E256CA" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Estimated actuarial gains (losses)</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_9CD45D30971F5E985CE85171A5E265D2_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_9CD45D30971F5E985CE85171A5E265D2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Long-term rate of return on assets assumption (as a percent)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_9CD45D30971F5E985CE85171A5E265D2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_C8FBF8E55A623E2126E45171A5E260FE_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_C8FBF8E55A623E2126E45171A5E260FE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Discount rate (as a percent)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_C8FBF8E55A623E2126E45171A5E260FE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_43F6376FFAAD8CFB75DF5171A5E33318_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_43F6376FFAAD8CFB75DF5171A5E33318" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Target (as a percent)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_43F6376FFAAD8CFB75DF5171A5E33318" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_43F6376FFAAD8CFB75DF5171A5E33318" xlink:to="lab_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_43F6376FFAAD8CFB75DF5171A5E33318" xlink:type="arc" />
    <link:label id="lab_lii_PercentageOfFairValueOfPlanAssetsHeld_C24C6B70A4B55B0A898B5171A5E3E9CD_terseLabel_en-US" xlink:label="lab_lii_PercentageOfFairValueOfPlanAssetsHeld_C24C6B70A4B55B0A898B5171A5E3E9CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of fair value in our plan assets</link:label>
    <link:label id="lab_lii_PercentageOfFairValueOfPlanAssetsHeld_C24C6B70A4B55B0A898B5171A5E3E9CD_label_en-US" xlink:label="lab_lii_PercentageOfFairValueOfPlanAssetsHeld_C24C6B70A4B55B0A898B5171A5E3E9CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Fair Value Of Plan Assets Held</link:label>
    <link:label id="lab_lii_PercentageOfFairValueOfPlanAssetsHeld_C24C6B70A4B55B0A898B5171A5E3E9CD_documentation_en-US" xlink:label="lab_lii_PercentageOfFairValueOfPlanAssetsHeld_C24C6B70A4B55B0A898B5171A5E3E9CD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of Fair Value of Plan Assets Held.</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_PercentageOfFairValueOfPlanAssetsHeld" xlink:label="loc_lii_PercentageOfFairValueOfPlanAssetsHeld_C24C6B70A4B55B0A898B5171A5E3E9CD" xlink:type="locator" />
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    <link:label id="lab_lii_TransferofpensionplanobligationtoLifeInsurancecompany_8A7A5998423ED0C50D685171A5E312E2_terseLabel_en-US" xlink:label="lab_lii_TransferofpensionplanobligationtoLifeInsurancecompany_8A7A5998423ED0C50D685171A5E312E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">transfer of pension plan obligation to Life Insurance company</link:label>
    <link:label id="lab_lii_TransferofpensionplanobligationtoLifeInsurancecompany_8A7A5998423ED0C50D685171A5E312E2_label_en-US" xlink:label="lab_lii_TransferofpensionplanobligationtoLifeInsurancecompany_8A7A5998423ED0C50D685171A5E312E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">transfer of pension plan obligation to Life Insurance company</link:label>
    <link:label id="lab_lii_TransferofpensionplanobligationtoLifeInsurancecompany_8A7A5998423ED0C50D685171A5E312E2_documentation_en-US" xlink:label="lab_lii_TransferofpensionplanobligationtoLifeInsurancecompany_8A7A5998423ED0C50D685171A5E312E2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">transfer of pension plan obligation to Life Insurance company</link:label>
    <link:loc xlink:href="lii-20191231.xsd#lii_TransferofpensionplanobligationtoLifeInsurancecompany" xlink:label="loc_lii_TransferofpensionplanobligationtoLifeInsurancecompany_8A7A5998423ED0C50D685171A5E312E2" xlink:type="locator" />
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