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Determine the correct tax recovery period and deduction schedule for your cooling systems.
Depreciation depends on how the unit is installed.
Prior to the Tax Cuts and Jobs Act of 2017, HVAC systems in commercial buildings were locked into the building's 39-year recovery period as structural components. The TCJA introduced a major change: qualified improvement property (QIP) for nonresidential buildings was assigned a 15-year recovery period, and the IRS confirmed that HVAC systems meeting the QIP definition can now use this shorter life. This distinction can be worth hundreds of thousands of dollars in accelerated deductions. A retail chain spending $800,000 to replace rooftop HVAC units across 20 store locations would claim approximately $20,512 per year under 39-year straight-line, versus $53,600 in year one under 15-year MACRS (9.5% first-year rate for 15-year property) — before any Section 179 or bonus depreciation election.
Residential rental property HVAC falls into a different category. Central air conditioning systems that are structural components of a residential rental building use the building's 27.5-year recovery period. Portable window units and through-wall air conditioners installed in individual rental units are 5-year personal property — completely separable from the building basis and depreciable at the accelerated 200% declining balance rate.
The TCJA's expansion of Section 179 to cover certain building improvements — specifically HVAC, roofing, fire protection, and security systems for nonresidential real property — created a planning opportunity that many commercial property owners still underutilize. A restaurant replacing its kitchen exhaust and HVAC system for $95,000 can now elect to expense the entire $95,000 under Section 179 in the year of installation, provided the building is nonresidential and the improvement meets the QIP definition. This is a dramatic improvement over the pre-2017 world where the same system would have been depreciated at $2,436 per year for 39 years. The key requirement: the improvement must be placed in service for an already-open nonresidential building (not initial construction), and the business must have sufficient taxable income to absorb the deduction.
Businesses and homeowners can often claim both a depreciation deduction and a tax credit on the same HVAC investment. The Inflation Reduction Act extended and expanded the Section 179D Energy Efficient Commercial Buildings Deduction, which provides up to $5.00 per square foot for commercial buildings meeting certain energy reduction thresholds — potentially generating $50,000 or more in additional deductions for a 10,000 sq ft office building. For homeowners, the Energy Efficient Home Improvement Credit provides up to $600 per year for qualifying central air conditioners and up to $2,000 for heat pump systems. The credit reduces your tax bill dollar-for-dollar rather than merely reducing taxable income. Importantly, the depreciable basis of the asset must be reduced by the amount of any credit received before calculating depreciation — a business claiming a $2,000 credit on a $20,000 HVAC installation depreciates $18,000, not $20,000.