We have the second a/c and a temperature sensor in the m/b. During our walk-thru the rep showed us how to set the temps for the two zones. We have set different temps for the m/b (door closed) and lower area and verified using thermometers that the system works. I am not an expert on a/c or the new duct work, all we know is the new system works real well with two a/c in 90+ temps.
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