HVAC now qualifies for Section 179 expense deduction; however, in order to take advantage of it your property will have to show a profit. As for depreciation, if they are part of the central HVAC system you have to depreciate them over 27.5 years. If they are stand alone units, more like window AC units (i.e. not a part of the structure of the building) then you can depreciate them over a seven year period.
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