You can claim a tax credit for 10% of the cost of qualified energy efficiency improvements and 100% of residential energy property costs. This credit is worth a maximum of $500 for all years combined, from 2006 to its expiration. Of that combined $500 limit,
- A maximum of $200 can be for windows.
- The maximum tax credit for a furnace circulating fan is $50.
- The maximum credit for a furnace or boiler is $150.
- The maximum credit for any other single residential energy property cost is $300.
The window manufacturer should be able to tell you if they meet the standards set by the Department of Energy.
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