You need form 5695 to be part of your return. Follow these steps:
Under deductions and credits,
select home energy credit
Did you make improvements? select Yes
continue through, main home in US questions
Energy saving improvements, continue
continue answering through windows, prior year credits and so on.
Related:
Energystar is a government agency with details for every year and credit.
About Form 5695, Residential Energy Credits
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