Heat pump

An electric heat pump is one way to heat a building. It works a lot like air conditioning but in reverse: The hot air goes indoors; the cold air goes outdoors.

Heat pumps are more energy-efficient than electric heaters.^{[QUANTIFICATION needed]}

Research needed for this page

• How much more energy-efficient can a heat pump be?
  • How does this depend on outdoor temperature?
• How much energy does it typically take to manufacture and install a heat pump?
• Do heat pumps involve any rare minerals or pollutant gases? To what extent is this a concern?
• How often (if ever) is it viable/worthwhile to repurpose an air conditioner in the winter, to help with heating?