Advances in heat pump technology are creating an energy-efficient alternative to furnaces and air conditioners. Such advances include two-speed compressors, variable-speed motors, desuperheaters, scroll compressors, and back-up burners are all helping to overcome the former limitations of heat pumps. 

Heat pumps will be an important part of the transition to a smart electric grid, renewable energies, and efficient buildings because of their energy efficiency and use of electricity as a fuel source in many systems. 

There are three main types of heat pumps: air-to-air, water source, and geothermal. They collect heat from the air, water, or ground outside your home and concentrate it for use inside. For homes without ducts, air-source heat pumps are also available in a ductless version called a mini-split heat pump.  

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