how does cold air return work for cooling in the summer? I have read that the cold air return should be at the ceiling level. to me this does not make sense and I am hoping that someone can explain the premise behind it.
seems to me that drawing in the hot air close to the ceiling would make the AC spend more energy to cool off that air. If the cold air was returned to the system from the basement (where the cold air settles) it would take less energy to cool that air and push it thru the system (and viseversa in the winter).
In my home, I have a large air return at the ceiling level on the ground floor, a small return on the floor in the addition and a medium return in the basement that goes directly into the air handler.
I guess my questions are, can someone explain in laymans terms the idea behind cold/warm air return and
should I block of the returns in the basement and the one in the addition or the one at the ceiling to help the cooling efficiency of my system.
Thanks in advance!