Heating and Cooling Fuel

Air Conditioning cooling equipment is almost exclusively powered by electricity. There are more exotic systems are available that use natural gas internal combustion engine to drive a compressor or natural gas to fire and absorption chiller.
Heating choices are more numerous. The first choice for most owners will be a natural gas furnace or boiler. Electric driven heat pump / air conditioners are popular in the south. Dual fuel gas furnace and heat pump combinations are common. Electric furnaces or resistance heat is not recommended as a primary heating source due to inefficiency and high operating cost.
In some east and northern states fuel oil furnaces are common. In rural areas gas furnaces can be converted to propane gas.
Exotic Fuels
Free fuels such as solar are available in several forms.
• Passive solar utilizes architectural features to take advantage of sunlight when heating is needed and to reduce the heating effect when cooling is needed. Roof overhangs, shading and landscaping can be used very effectively.
• Cooling systems commonly called “Geothermal” are actually solar systems that use the solar energy stored in the earth to increase the efficiency of a heat pump.
• Solar thermal systems use a solar collector to concentrate the energy in water hot enough to heat the space.
• Solar PV convert solar radiation to electricity to drive electric cooling and heating systems.
• Bio Fuels are a form of renewable solar energy. These fuels store solar energy in a usable form. Wood and wood pellets are an example of a renewable bio fuel.