Heat Pumps Are a Weapon in the E.U.’s Energy Face-Off With Russia

In the world of climate action, heat pumps often get short shrift. Used to heat or cool homes and buildings, the appliances aren’t flashy like EVs, and have none of the imposing presence of a wind turbine. They won’t turn heads in the neighborhood like rooftop solar panels. Instead, the squat square boxes attached to an outside wall or roof are about as impressive-looking as an AC unit.