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en.wikipedia.org/wiki/Air_source_heat_pumps

An air source heat pump (ASHP) is a system which transfers heat from outside to inside a ... the higher cost of electricity relative to natural gas (using 2012 retail prices in Ottawa, Ontario) made natural gas the less expensive energy source.

en.wikipedia.org/wiki/Heat_pump

A heat pump is a device that transfers heat energy from a source of heat to a destination called .... In cold weather, the outdoor unit of an air source heat pump needs to be intermittently defrosted. This will cause the .... This part of the work cycle results in two sudden changes of the noise made by the fan. The acoustic effect of ...

energy.gov/energysaver/air-source-heat-pumps

If you live in a warm climate, air-source heat pumps might be an efficient way to ... pump's refrigeration system consists of a compressor and two coils made of ...

www.renewableenergyhub.us/heat-pumps-information/the-history-of-heat-pumps.html

The history of how air source heat pumps and ground source heat pumps were ... After he saw that his invention was successful, he built a full size heat pump to ...

energy.gov/eere/energybasics/articles/air-source-heat-pump-basics

Aug 19, 2013 ... Air-source heat pumps transfer heat between the inside of a ... and two coils made of copper tubing (one indoors and one outside), which are ...

www.forbes.com/sites/tomkonrad/2014/01/15/are-air-source-heat-pumps-a-threat-to-geothermal-heat-pump-suppliers

Jan 15, 2014 ... Efficient air source heat pumps can now compete with geothermal heat ... significant heating efficiency at 5°F, a change which has made them ...

www.franklinenergy.com/wp-content/uploads/2014/10/AirSource-Heat-Pump-Efficiency-Gains-2011.pdf

heating. Appropriate considerations should be made in program eligibility requirements ... energy savings by operating an air source heat pump (ASHP) to lower ...

www.neo.ne.gov/home_const/airsource_heatpump.pdf

An air-source heat pump can provide efficient heating and cooling for your home, ... made of copper tubing, which are surrounded by aluminum fins to aid heat ...

www.colonyac.com/webapp/p/474/air-source-heat-pumps

An air-source heat pump can provide efficient heating and cooling for your ... A heat pump's refrigeration system consists of a compressor and two coils made of  ...

www.energystar.gov/products/heating_cooling/heat_pumps_air_source

image of a heat source air pump Earning the ENERGY STAR means products meet strict energy efficiency guidelines set by the U.S. Environmental Protection ...