From what I see on the IRS website at https://www.irs.gov/newsroom/energy-incentives-for-individuals-residential-property-updated-question... (which I suggest you review)
Qualified energy efficiency improvements include the following qualifying products:
- Energy-efficient exterior windows, doors and skylights
- Roofs (metal and asphalt) and roof products
- Insulation
Residential energy property expenditures include the following qualifying products:
- Energy-efficient heating and air conditioning systems
- Water heaters (natural gas, propane or oil)
- Biomass stoves
