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2. How Often Should You Clean Your Air Ducts? Experts Explain - AOL

   www.aol.com/often-clean-air-ducts-experts...

   If you turn on the air conditioning unit to stay cool in the summer, or if you turn on the heat to stay warm in the winter, you have an HVAC system, or Heating, Ventilation and Air Conditioning ...

3. Should You Close Vents In Unused Rooms During Winter ... - AOL

   www.aol.com/lifestyle/close-vents-unused-rooms...

   What Role Do Vents Play In Heating And Cooling A Home? Vents act as exit and entry points for warm and/or cool air to lower or raise the temperature in your house. As the return removes the cool ...

4. What should you set your heat to in the winter? Avoid ... - AOL

   www.aol.com/set-heat-winter-avoid-thermostat...

   Experts offer a variety of other tips that, altogether, could cut down on your bills and ensure your heating unit is working at maximum efficiency. Have your heating unit inspected annually.

5. Heating, ventilation, and air conditioning - Wikipedia

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

   Air handling unit, used for heating, cooling, and filtering the air. Air cleaning and filtration removes particles, contaminants, vapors and gases from the air. The filtered and cleaned air then is used in heating, ventilation, and air conditioning. Air cleaning and filtration should be taken in account when protecting our building environments ...

6. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   The air-to-air type re-evaporates the water, discharges it through the ducted hose, and can run continuously. Many but not all portable units draw indoor air and expel it outdoors through a single duct, negatively impacting their overall cooling efficiency. Many portable air conditioners come with heat as well as a dehumidification function. [73]

7. Forced-air - Wikipedia

   en.wikipedia.org/wiki/Forced-air

   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. Forced air heating is the type of central heating most commonly installed in North America. [1]