Central AC: Frequently Asked Questions
http://garrettpqkv943.bearsfanteamshop.com/10-uncommon-pointers-for-keeping-cool-with-a-wrong-sized-a-c-unit
Central air conditioners flow cool air through a system of supply and return ducts. Supply ducts and registers (i.e., openings in the walls, floorings, or ceilings covered by grills) bring cooled air from the a/c