Quote:
Originally Posted by MplsPete
I recently spent two weeks in an older home in Alhambra, probably built in the late 90s. I like to look at the mechanical systems and try to figure out how they work.
In the garage, the HVAC unit sat atop a large box-like structure. Probably 3' x 3'. I've seen the same set up in pictures of other homes. So, what is the purpose of this? Is it some sort of air return system for the Air Conditioner? Just a stand to support the air exchanger?
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Yes, it's part of the air return system. The return air comes down into that box and then goes upward through the cooling coils and into the supply ductwork that distributes the cool air throughout the house. You may have been looking at a heat pump because that's the way mine looks.