To meet ambitious emissions-reduction goals, a small but growing number of states are promoting electrification of space and water heating as an important building decarbonization tool. However, one barrier states face is the need to ensure that fuel-switching and electrification efforts are beneficial. This policy brief from the American Council for an Energy-Efficient Economy (ACEEE) assesses existing state policies in this rapidly changing area. Our goal is to assist regulators and program administrators seeking to design effective programs that meet their maximum potential to achieve net carbon-reduction benefits. Our last look at these policies, in 2020, saw limited adoption of such programs, mostly limited to northeast states like New York, Massachusetts, and Maine. The new report shows similar efforts in other parts of the country.