Hi acwgolfer!
You must claim the credit in the year the energy efficient appliances are installed, you can't defer it. Some other energy credits are taken over three years, but they begin in the year of installation.
Here is a great reference regarding energy efficient credits:
https://www.irs.gov/credits-deductions/frequently-asked-questions-about-energy-efficient-home-improv...
Hope this helps!
Cindy
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