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2. Is Your HVAC System Making Your Home More Dusty? - AOL

   www.aol.com/hvac-system-making-home-more...

   Dust affects your indoor air quality by posing several health threats to the respiratory system. Dust particles in the air can make asthma worse and cause allergic reactions for those who already ...

3. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   Unlike other types of air conditioners, evaporative coolers rely on the outside air to be channeled through cooler pads that cool the air before it reaches the inside of a house through its air duct system; this cooled outside air must be allowed to push the warmer air within the house out through an exhaust opening such as an open door or window.

4. Heating, ventilation, and air conditioning - Wikipedia

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

   An air conditioning system, or a standalone air conditioner, provides cooling and/or humidity control for all or part of a building. Air conditioned buildings often have sealed windows, because open windows would work against the system intended to maintain constant indoor air conditions.

5. Glossary of HVAC terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_HVAC_terms

   A two-stage air conditioner is designed to operate on high and low settings during different weather conditions and seasons. The high setting is used during extreme weather, and the low setting is used during moderate weather. This type of air conditioner produces a balanced temperature and is in use for a longer period of time.

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

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

   Jeffrey May of May Indoor Air Investigations and co-author of “My House Is Killing Me ... mites and pollen in furnace blower cabinets and ... Refrigerating and Air Conditioning Engineers ...

7. The best portable air conditioners - AOL

   www.aol.com/news/best-portable-air-conditioners...

   Shinco 10,000 BTU Portable Air Conditioner $ at Amazon. Best portable air conditioner for smaller rooms:Black+Decker Black+Decker BPACT08WT 8,000 BTU Portable Air Conditioner. Cooling power: 8,000 ...