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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 ..... Ultimately, due to Carnot efficiency limits, the heat pump's performance will decrease as the outdoor-to-indoor temperature difference increases ...

energy.gov/energysaver/heat-pump-systems

Live in a mild climate? A heat pump might be your best option for efficient heating and cooling.

www.energyvanguard.com/blog/69996/The-Shocking-Truth-About-Heat-Pumps

Aug 22, 2013 ... Should you avoid installing a heat pump and go with gas heat for your home? ... Then you've got to factor in the efficiency of the furnace.

www.mitsubishicomfort.com/articles/energy-efficiency/busting-myths-about-electric-heat-pumps

Here are the top 5 misconceptions about ductless heat pumps. ... Like any heating system, ductless heat pumps are more efficient in well-insulated new build ...

www.savewithsrp.com/advice/heatpump.aspx

A heat pump is highly efficient because it doesn't manufacture the heat it distributes. Instead, it finds heat in the outside air and "pumps" or "moves" it into your ...

www.consumerreports.org/cro/heat-pumps/buying-guide

Oct 19, 2016 ... According to the American Council for an Energy-Efficient Economy, you should consider buying a heat pump that is at least 15 SEER and 8.5 ...

www.lennox.com/products/heating-cooling/heat-pumps/xp21

Lennox XP21 heat pump combines high efficiency, 19.20 SEER & 9.70 HSPF, with soundless operation. Pair with solar panels to create a solar powered system.

hyperphysics.phy-astr.gsu.edu/hbase/thermo/heatpump.html

A heat pump is subject to the same limitations from the second law of thermodynamics as any other heat engine and therefore a maximum efficiency can be ...

www.carrier.com/residential/en/us/products/heat-pumps

The Infinity series heat pump is part of an intelligent, communicating system that delivers superior comfort, quiet performance and enviable efficiency in both ...

asm-air.com/hvac/heat-pump-vs-furnace-pros-cons

Jun 1, 2017 ... The higher the AFUE percentage, the more efficient the furnace or heat pump is. Below is a chart that directly compares different types of fuel ...