I did install a new heating and air conditioning unit in my primary residence in 2020 paid $9,440. In 2010 we installed new window paid $10,600. We received that year an energy credit of $1500 for purchasing windows. Would I still be eligible for any credit, or does $1500 use up my life time credit of $500. I saw something that windows were capped at $200 credit, which I didn't know if I subtract $200 capped limit from $500 limit and get $300 for this year. When I enter information into turbo tax and put I got $1500 in 2010. It say 0 for my credit if I did it correctly.
