We only have one AC. In triple-digit heat, we use our quick cool feature (as Ozz says "dump") opening the AC to dump the air directly down from the unit, then supplement it by using our 12-volt silent breeze fan to circulate the floor-level cool air along the lower extremities of the living area. We find that we are comfortable even in this extreme heat. We don't even consider adding a second AC.
Orv
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