Mike De Socio is a CNET contributor who writes about energy, personal finance, electric vehicles and climate change. He's also the author of the nonfiction book, "Morally Straight: How the Fight for ...

Heat pumps have annually outsold gas furnaces for several years now, and with the recent introduction of more high-efficiency, cold-climate, air-source heat pumps, that trend is likely to continue.

Homeowners looking for an energy-efficient alternative to traditional air conditioners in the spring and summer months (and furnaces in the winter) might want to invest in a heat pump. It's a type of ...