Starting in 2023, tax credits for energy efficient home improvements are now more widely available. The previous lifetime exclusion has been eliminated. Most of these credits are available for qualified improvements to your principal residence and may be taken for the the year of installation, as opposed to the year purchased. For more information see the following link on the IRS website: Frequently asked questions about energy efficient home improvements and residential clean energy property credits — Qualifying Residence
For information on energy-efficient products, visit the U.S. Department of Energy's Energy Star Website.