Front and rear A/C...
We don't run the front A/C very often but with 95° plus days here in Louisville KY I found both A/Cs necessary.
I also discovered that the front A/C was sending cooler air down the steps past the rear A/C thermostat. This caused the thermostat to cool prematurely creating a false reading and shutting the rear A/C down keeping the livingroom considerably warmer than desired.
To solve the problem was quite easy. I took a small Glad storage bowl and taped it over the thermostat. It worked as a shield from the front A/Cs cooler air and the rear A/C has been working fine. Within a half an hour I brought the livingroom down from 86° to a more comfortable 75°s.
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