Central AC: What House Owners Need to Know

https://marykaoprz.doodlekit.com/blog/entry/14690345/10-mistakes-property-owners-make-when-getting-a-furnace-or-ac-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) carry cooled air from the a/c unit