You only qualify for one credit. The limit for the year is $600 for AC.
You will find this by going to
- Deductions and Credits
- Home Energy Credits
- Walk through and answer the questions regarding your AC.
Some other things to know about The Home Improvement Energy Efficient Credit
- This credit is a is a nonrefundable credit. This means in order to claim the credit you must have a tax liability to offset it. If you do not have a tax liability equal to the credit the credit will be reduced to match your liability or down to $0.
- use it or lose it credit. If you do have enough tax liability in the year you buy and install the item, you will not be able to carry the credit forward.
- Doors, windows and insulation must be installed on your primary home.
- The home must be in the US
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