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www.reference.com/article/examples-heat-sources-6e5a44df7f1ad44f

A few examples of heat sources are the sun, friction, chemical reactions and the earth. The sun is a natural heat source that is renewable and that can be converted into electricity.

www.reference.com/article/cheapest-heating-source-1a7478fe3369fe05

A heat pump is the most cost-effective option for home heating, but it is important for homeowners to ensure that the pump is installed correctly to ensure efficient heat production. Heat pumps utilize outside air to heat homes in the winter and cool homes in the summer...

www.reference.com/article/earth-s-primary-sources-heat-c028f466805b9d4b

Earth's primary sources of heat are from radioactive decay, frictional heating and Earth's formation. Although Earth was created around 4.5 billion years ago, there is still leftover heat from its formation.

www.reference.com/article/air-source-heat-pump-30d3fa098a560146

An air-source heat pump is an energy-efficient heating and cooling unit for the home that performs best in areas with sub-freezing winter temperatures. The device works by transferring heat from the air rather than converting it from fuel.

www.reference.com/article/two-main-sources-heat-inside-earth-5e2fe11a83868270

The internal heat of the Earth is a result of radioactive decay and residual heat. The gravitational energy left over from Earth’s formation represents around 10 percent of Earth’s internal heat, whereas the majority of heat comes from the radioactive decay of chemical ...

www.reference.com/article/electric-source-heat-pump-work-d3fbac6dc23d02dd

Heat pumps transfer the warmth in air outdoors inside a home by using electricity. Almost all heat pumps can also be reversed to function similarly to an air conditioner by transferring indoor heat outside.

www.reference.com/article/three-main-sources-earth-s-internal-heat-7a76e0ef97c6ad35

The Department of Geological Sciences at San Diego State University names extraterrestrial impacts, gravitational contraction and radioactive decay as the three main sources of Earth's internal heat. However, Earth's internal heat is much lower now than it was at the ea...