Central Air: What House Owners Need to Know
https://canvas.instructure.com/eportfolios/142732/wayloniepm657/Seven_Important_Rules_to_Save_Money_on_Cooling_this_Summertime
Central air conditioners flow cool air through a system of supply and return ducts. Supply ducts and registers (i.e., openings in the walls, floors, or ceilings covered by grills) bring cooled air from the a/c