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2. Heating seasonal performance factor - Wikipedia

   en.wikipedia.org/wiki/Heating_seasonal...

   A well designed ground source heat pump installation should achieve an SPF of 3.5, or over 5 if linked to a solar-assisted thermal bank. [6] Example: For a heat pump delivering 120,000,000 BTU during the season, when consuming 15,000 kWh, the HSPF can be calculated as : HSPF = 120000000 (BTU) / (1000) / 15000 (kWh) HSPF = 8

3. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   The heat pump is significantly more energy-efficient than electric resistance heating, because it moves energy from air or groundwater to the heated space and the heat from purchased electrical energy. When the heat pump is in heating mode, the indoor evaporator coil switches roles and becomes the condenser coil, producing heat.

4. January–March 2023 in science - Wikipedia

   en.wikipedia.org/wiki/January–March_2023_in...

   3 March – After a study (31 Jan) indicated that in building heating in the EU, the feasibility of staying within planetary boundaries is possible only through electrification, with green hydrogen heating being 2–3 times more expensive than heat pump costs, [337] [338] a study indicates that replacing gas boilers with heat pumps is the ...

5. Metrication in the United States - Wikipedia

   en.wikipedia.org/wiki/Metrication_in_the_United...

   Fuel prices are mostly given in customary units, such as dollars per gallon, barrel, thousand cubic feet, or ton (short or long). Heating, cooling, and combustion are often measured in BTUs per hour or refrigeration tons , and powerplant efficiency is often measured by its "heat rate", in BTU per kilowatt hour.