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  2. Underfloor heating - Wikipedia

    en.wikipedia.org/wiki/Underfloor_heating

    Costs about $7/million b.t.u. Propane mainly made from oil, less efficient than natural gas by volume, and generally much more expensive on a b.t.u. basis. Produces more carbon dioxide than "methane" on a b.t.u. basis. Costs about $25/million b.t.u. Coal, oil, or waste oil; Electricity; Solar thermal; Wood or other biomass; Bio-fuels

  3. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    Such a system contains a boiler, furnace, or heat pump to heat water, steam, or air in a central location such as a furnace room in a home, or a mechanical room in a large building. The heat can be transferred by convection, conduction, or radiation. Space heaters are used to heat single rooms and only consist of a single unit.

  4. Upflow anaerobic sludge blanket digestion - Wikipedia

    en.wikipedia.org/wiki/Upflow_anaerobic_sludge...

    Upflow anaerobic sludge blanket (UASB) technology, normally referred to as UASB reactor, is a form of anaerobic digester that is used for wastewater treatment. The UASB reactor is a methanogenic (methane-producing) digester that evolved from the anaerobic clarigester .

  5. Furnace (central heating) - Wikipedia

    en.wikipedia.org/wiki/Furnace_(central_heating)

    Single-stage furnaces are relatively inexpensive since the technology is rather simple. However, the simplicity of single-stage gas furnaces come at the cost of blower motor noise and mechanical inefficiency. The blower motors on these single-stage furnaces consume more energy overall because, regardless of the heating requirements of the space ...

  6. Variable air volume - Wikipedia

    en.wikipedia.org/wiki/Variable_air_volume

    This configuration can deliver air at variable temperatures or air volumes to meet the heating and cooling loads as well as the ventilation rates required by the space. [ 2 ] Most commonly, VAV boxes are pressure independent, meaning the VAV box uses controls to deliver a constant flow rate regardless of variations in system pressures ...

  7. Read the Transcript of Trump's Person of the Year Interview - AOL

    www.aol.com/read-transcript-trumps-person...

    Credit - Photograph by Platon for TIME. P resident-elect Donald Trump, TIME’s 2024 Person of the Year, sat down for a wide-ranging interview at his Mar-a-Lago Club in Palm Beach, Fla., on Nov ...

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