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2. Ground source heat pump - Wikipedia

   en.wikipedia.org/wiki/Ground_source_heat_pump

   A ground source heat pump (also geothermal heat pump) is a heating/cooling system for buildings that use a type of heat pump to transfer heat to or from the ground, taking advantage of the relative constancy of temperatures of the earth through the seasons. Ground-source heat pumps (GSHPs) – or geothermal heat pumps (GHP), as they are ...

3. Alternative fuel - Wikipedia

   en.wikipedia.org/wiki/Alternative_fuel

   In the US, the EPA defines alternative fuel as. Alternative fuel including gaseous fuels such as hydrogen, natural gas, and propane; alcohols such as ethanol, methanol, and butanol; vegetable and waste-derived oils; and electricity. These fuels may be used in a dedicated system that burns a single fuel, or in a mixed system with other fuels ...

4. Liquefied petroleum gas - Wikipedia

   en.wikipedia.org/wiki/Liquefied_petroleum_gas

   Tank cars in a Canadian train for carrying liquid petroleum gas by rail. Liquefied petroleum gas, also referred to as liquid petroleum gas ( LPG or LP gas ), is a fuel gas which contains a flammable mixture of hydrocarbon gases, specifically propane, n -butane and isobutane. It can sometimes contain some propylene, butylene, and isobutene.

5. Heat pump - Wikipedia

   en.wikipedia.org/wiki/Heat_pump

   e. A heat pump is a device that consumes work (or electricity) to transfer heat from a cold heat sink to a hot heat sink. Specifically, the heat pump transfers thermal energy using a refrigeration cycle, cooling the cool space and warming the warm space. [1] In cold weather, a heat pump can move heat from the cool outdoors to warm a house (e.g ...

6. He wants a less hectic, car-free life. Here’s why this ...

   www.aol.com/wants-less-hectic-car-free-110605174...

   Michael Steven Grant of New York City wants to retire in a smaller-scale place with access to a larger city. Here’s why he likes Sitges on Spain’s Mediterranean coast.

7. Propane - Wikipedia

   en.wikipedia.org/wiki/Propane

   It is normal for a 7-liter medium-duty diesel truck engine to increase fuel economy by 20 to 33 percent when a propane boost system is used. It is cheaper because propane is much cheaper than diesel fuel. The longer distance a cross-country trucker can travel on a full load of combined diesel and propane fuel means they can maintain federal ...