For example, if you plan to add geothermal heat pumps, residential small wind turbines or solar energy systems, the credit is equal to 30% of the cost with no upper limit.
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The page also has a link to Form 5695 (residential energy credits), which you'll need to attach to your 1040 to claim the credit.
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The specific forms affected include federal form 5695 (Residential Energy Credits), federal form 4562 (Depreciation and Amortization) and federal form 3800 (General Business Credit).