1. No, the credit is not income based. This credit must be on your main home.
2. Form 5695 shows energy credit. It carries to sch 3, line 5. This carries to 1040 line 20.
3. Yes, for energy efficiency, there is a credit available. For 2022, there is $500 lifetime cap, see FAQ Energy. For 2023, the lifetime cap is removed and the annual limit raised to $1200.
My guess would be you have reached the lifetime limit already with line 18.
@sonzoil
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