In cooling mode, they work exactly like air conditioners. And come colder weather, they’re the most energy-efficient system for home heating. They’ve been common in warm parts of the U.S. for ...

How to Make Air Conditioner at Home - Simple Toy Air Conditioner ...

However, heat pumps can do something air conditioners cannot: warm your home by extracting heat and ... including the type of unit you choose, its efficiency rating and where you live.