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  2. 10 Signs Your Heater Isn’t Working as Well as It Could (and ...

    www.aol.com/10-signs-heater-isn-t-200000044.html

    Heater Won't Turn On. There is a clear problem that needs to be resolved if your heater simply won't turn on, but before calling in HVAC pros to help solve the situation, there are a few easy ...

  3. HVAC Troubleshooting: Common complaints and how to ... - AOL

    www.aol.com/news/2008-03-26-hvac-troubleshooting...

    With the way we take a home's heating and cooling systems for granted, it s easy to think that because you press a button and air flows, everything's working as it should. In reality, this couldn ...

  4. Heating, ventilation, and air conditioning - Wikipedia

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

    Heating, ventilation, and air conditioning (HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Its goal is to provide thermal comfort and acceptable indoor air quality.

  5. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

  6. Sick building syndrome - Wikipedia

    en.wikipedia.org/wiki/Sick_building_syndrome

    Increasing the number of air changes per hour; the American Society of Heating, Refrigeration and Air-Conditioning Engineers recommend a minimum of 8.4 air exchanges per 24-hour period; Increased ventilation rates that are above the minimum guidelines [22] Proper and frequent maintenance of HVAC systems; UV-C light in the HVAC plenum

  7. Furnace (central heating) - Wikipedia

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

    In some areas electrical resistance heating is used, especially where the cost of electricity is low or the primary purpose is for air conditioning. Modern high-efficiency furnaces can be up to 98% efficient and operate without a chimney, with a typical gas furnace being about 80% efficient. [ 1 ]

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