These rules by the Department Of Energy (DOE) update the energy efficiency standards for commercial unitary air conditioners and heat pumps, also known as commercial rooftop units. Compliance will be required from January 1, 2029. DOE estimates these standards will result in cumulative emission reductions of nearly 109 million metric tons of carbon dioxide, an amount roughly equivalent to the combined annual emissions of nearly 14.2 million homes.

In March 2025, DOE has announced this policy will be delayed and up for review.