If you installed a window air conditioner, for instance, you could deduct the cost under Rental Expenses.
If you installed a central air conditioning system ,however, that is considered a Capital Improvement and would be depreciated for 27.5 years, the same as the rental property itself.
If this is your situation, here's info on how to add an improvement as a Rental Asset.
Go to Assets/Depreciation from the Rental Summary screen.
You may have the option to expense certain improvements under the Safe Harbor Election for Small Taxpayers. When you begin the Assets/Depreciation section, TurboTax will ask you about this. If you want to deduct the cost fully this year, answer "yes" to include the this election on your return.
If your improvements don't qualify, or you simply wish to depreciate the cost over 27.5 years, continue through the Depreciation interview to set up a new asset.
More detailed information on rental expenses can be found at https://www.irs.gov/taxtopics/tc414.
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