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2. Forced-air - Wikipedia

   en.wikipedia.org/wiki/Forced-air

   The supply plenum directs air from the central unit to the rooms which the system is designed to heat. Regardless of type, all air handlers consist of an air filter, blower, heat exchanger/element/coil, and various controls. Like any other kind of central heating system, thermostats are used to control forced air heating systems.

3. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   Older furnaces sometimes relied on gravity instead of a blower to circulate air. [1]Gas-fired forced-air furnaces have a burner in the furnace fueled by natural gas.A blower forces cold air through a heat exchanger and then through duct-work that distributes the hot air through the building. [2]

4. Is your heater making you sick? How to avoid cold-like ...

   www.aol.com/lifestyle/heater-making-sick-avoid...

   But before you fire it up, be prepared that feeling nice and toasty may also come with a stuffy nose, dry throat, cough or even a headache. These cold-like symptoms are referred to as "heater ...

5. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   At that time central heating was coming into fashion in Britain, with steam or hot air systems generally being used. Details of furnace and expansion tube from Perkins' 1838 Patent. Perkins' 1832 apparatus distributed water at 200 degrees Celsius (392 °F) through small diameter pipes at high pressure. A crucial invention to make the system ...

6. HVAC control system - Wikipedia

   en.wikipedia.org/wiki/HVAC_control_system

   Another sign that could mean that the HVAC system is not running perfectly fine is if there is a bad smell to the air that it is providing. That often means that the air filters need to be replaced. Changing the air filters on an HVAC system is really important because they are exposed to a lot of dust depending on where your HVAC system is and ...

7. What's The Difference Between A Heat Pump And A Furnace ... - AOL

   www.aol.com/whats-difference-between-heat-pump...

   Dual systems combine a heat pump and furnace into the same unit, and are even more efficient. "This system is engineered to deliver optimal comfort and efficiency throughout the year, regardless ...