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 ...

If there's one surefire way to save money on energy bills, it's ditching an old, outdated HVAC system and replacing it with a newer, more efficient model. But how much you'll actually save depends on ...

Whether you have a gas furnace, a heat pump or something else, regular upkeep can save you money and keep your home's air cleaner. For many of us, our home’s heating and cooling system is easy to ...