I’m surprised it hasn’t been increasing faster. The US is in the midst of drive to replace heating systems of all kinds with more efficient heat pumps, with massive effort behind it, including restrictions on other kinds of heat, significant tax returns for upgrades of existing systems, etc… and they are lumping heat pumps into the figure.

> 88% of U.S. households use air conditioning (AC). Two-thirds of U.S. households use central AC or a central heat pump as their main AC equipment.