Quartz May 2, 2019
Coal began firing US homes and factories in the 1880s. A century later, the cheap, plentiful fuel was America’s primary one (pdf) for electricity generation. But its long reign is slowly coming to an end.
The best heat pump brands
Wondering which heat pump is right for your home? Our guide compares leading brands to help you cut energy bills, stay comfortable, and save year-round.
