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2. Underfloor heating - Wikipedia

   en.wikipedia.org/wiki/Underfloor_heating

   There is a likelihood that underfloor heating may add to offgassing and sick building syndrome in an environment, particularly when the carpet is used as flooring. [citation needed] 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.

3. Heating film - Wikipedia

   en.wikipedia.org/wiki/Heating_film

   A heating film, itself, is a variation of the modern ondol, but it doesn't require hot water and pipes as it is fully electric. There are also many variations of this underfloor heating system, as many underfloor heaters are based on PTC heating element, far-infrared rays, carbon film, or cables, etc. [6]

4. Electric heating - Wikipedia

   en.wikipedia.org/wiki/Electric_heating

   Economically, electric heat can be compared to other sources of home heating by multiplying the local cost per kilowatt hour for electricity by the number of kilowatts the heater uses. E.g.: 1500-watt heater at 12 cents per kilowatt hour 1.5×12=18 cents per hour. [14]

5. Radiant heating and cooling - Wikipedia

   en.wikipedia.org/wiki/Radiant_heating_and_cooling

   The lower temperatures and large surface area of underfloor heating systems make them ideal heat emitters for air source heat pumps, evenly and effectively radiating the heat energy from the system into rooms within a home. The maximum temperature of the heating surface can vary from 29–35 °C (84–95 °F) depending on the room type.

6. Ground source heat pump - Wikipedia

   en.wikipedia.org/wiki/Ground_source_heat_pump

   Commercial systems maintenance costs in the US have historically been between $0.11 to $0.22 per m 2 per year in 1996 dollars, much less than the average $0.54 per m 2 per year for conventional HVAC systems.

7. Heating system - Wikipedia

   en.wikipedia.org/wiki/Heating_system

   A heating system is a mechanism for maintaining temperatures at an acceptable level; ... Examples include electric space heaters, fireplaces, and solar heating. [3]