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Return air duct

4 years ago

My 1st floor always stays in the low 80s degrees eventhou even though I set my temp to 78 deg.


my question is…


I have 2 central units for 1st and 2nd floor.

When I turn the AC on the 1st floor which “return air duct” should suck the air from? Should the air suck from the same floor or the 2nd floor?

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