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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. Hypocaust - Wikipedia

   en.wikipedia.org/wiki/Hypocaust

   Hypocaust under the floor in a Roman villa in Vieux-la-Romaine, near Caen, France. A hypocaust (Latin: hypocaustum) is a system of central heating in a building that produces and circulates hot air below the floor of a room, and may also warm the walls with a series of pipes through which the hot air passes.

4. 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.

5. Columbia Gas prices are going up but heating bill assistance ...

   www.aol.com/news/columbia-gas-prices-going...

   OpEd: Columbia Gas and other utility providers are working hard to connect eligible customers with federal, state, and local income-eligible payment assistance programs to help them keep their ...

6. Underfloor air distribution - Wikipedia

   en.wikipedia.org/wiki/Underfloor_air_distribution

   While overhead systems typically use ducts to distribute the air, UFAD systems use the underfloor plenum formed by installation of a raised floor. The plenum generally sits 0.3 and 0.46 metres (12 and 18 in ) above the structural concrete slab, although lower heights are possible.

7. Heating degree day - Wikipedia

   en.wikipedia.org/wiki/Heating_degree_day

   Heating degree day (HDD) is a measurement designed to quantify the demand for energy needed to heat a building. HDD is derived from measurements of outside air temperature . The estimated average heating energy requirements for a given building at a specific location are considered to be directly proportional to the number of HDD at that location.