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Not sure what the exact formula is but HVAC guys always told me that proper cooling is measured between the air temp entering the cold air return compared to the temp exiting a register.
I was told last year that when it is 105 outside do not expect it to get cooler than 80 inside. And that is in a house with a 2 zone heat pump system R30 insulation and dual pane, gas filled windows.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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