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Heat pumps are currently the primary heating system for 18.87 million U.S. homes, out of the 140 million homes in the country, according to the Department of Energy.
The district heating system can use heat sources impractical to deploy to individual homes, such as heavy oil, wood byproducts, or nuclear fission. The distribution network is more costly to build than for gas or electric heating, and so is only found in densely populated areas or compact communities.
Electric heat can be accurately applied at the precise point needed in a process, at high concentration of power per unit area or volume. Electric heating devices can be built in any required size and can be located anywhere within a plant. Electric heating processes are generally clean, quiet, and do not emit much byproduct heat to the ...
The main source of harmful greenhouse gas emissions is the type of heating systems being used. For example; central heating systems depending on what they use to burn/electricity consumed to heat the system. Another environmental impact is during winter months heating systems depend heavily more on fossil fuel based energy production. [11]
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Electric underfloor heating systems cause low frequency magnetic fields (in the 50–60 Hz range), old 1-wire systems much more so than modern 2-wire systems. [ 50 ] [ 51 ] The International Agency for Research on Cancer (IARC) has classified static and low-frequency magnetic fields as possibly carcinogenic (Group 2B).
The higher investment above conventional oil, propane or electric systems may be returned in energy savings in 2–10 years for residential systems in the US. [ 50 ] [ 47 ] [ 49 ] The payback period for larger commercial systems in the US is 1–5 years, even when compared to natural gas. [ 47 ]
Warm air systems distribute the heated air through ductwork systems of supply and return air through metal or fiberglass ducts. Many systems use the same ducts to distribute air cooled by an evaporator coil for air conditioning. The air supply is normally filtered through air filters [dubious – discuss] to remove dust and pollen particles. [15]