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2. Tested and Approved: The Best Air Conditioners for Staving ...

   www.aol.com/lifestyle/best-air-conditioners...

   This Black & Decker portable air conditioner is best suited to small-room cooling, perhaps even supplementing a central-air system in a tall condominium or townhouse that has an uncomfortably warm ...

3. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   Air conditioning equipment will reduce the absolute humidity of the air processed by the system if the surface of the evaporator coil is significantly cooler than the dew point of the surrounding air. An air conditioner designed for an occupied space will typically achieve a 30% to 60% relative humidity in the occupied space.

4. Central vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Central_vacuum_cleaner

   Central vacuum installed with an air inlet Antique central vacuum inlet located in a dining room at Château Dufresne (Canadian Register of Historic Places, c. 1918) Typical central vacuum cleaner power unit for residential use (North America)

5. We Did the Research and *These* Are the Best Air Conditioner ...

   www.aol.com/did-research-best-air-conditioner...

   THE REVIEWS: “This is a very basic air conditioner, good for a small room (used in about 10x12 ft. room),” one shopper notes. “The controls are all knobs, with no temperature settings.

6. Heating, ventilation, and air conditioning - Wikipedia

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

   Central, "all-air" air-conditioning systems (or package systems) with a combined outdoor condenser/evaporator unit are often installed in North American residences, offices, and public buildings, but are difficult to retrofit (install in a building that was not designed to receive it) because of the bulky air ducts required. [32] (Minisplit ...

7. Air purifier - Wikipedia

   en.wikipedia.org/wiki/Air_purifier

   An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics , and at reducing or eliminating second-hand tobacco smoke .