Yes you should amend 2020. You can file an amended return using TurboTax for free. Use this link for infoormation on how to file an amended return. How to File an Amended Return
If you decide to amend your 2020 tax return, you may be able to deduct the total cost of the HVAC using Bonus Depreciation. Bonus depreciation applies only to personal property (not the building) with a useful life of less than 20 years. . However, if you prefer to not amend you can depreciate the asset over a 10 year period and claim the allowable depreciation for the second year on your 2021 tax return..
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