Unfortunately, the federal $500 Nonbusiness Energy Property Tax Credit is currently expired, and we don't know when (or if) Congress will approve this credit for tax year 2018. This means you cannot take the credit until it is renewed.
This credit covered energy-efficient improvements like windows, doors, skylights, insulation, roofing products, nonsolar water heaters, heating, ventilating, and cooling systems.
If this credit is approved after your file your 2018 return, you can file an amendment to claim the credit.
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