Central Aircon: FAQ

http://mylesapna929.theburnward.com/10-unusual-pointers-for-keeping-your-house-cool-with-a-struggling-a-c-unit

Central air conditioners flow cool air through a system of supply and return ducts. Supply ducts and signs up (i.e., openings in the walls, floors, or ceilings covered by grills) bring cooled air from the air conditioning