You should rule out a defective thermostat. I chased temperatures by lowering and raising the setting on my defective unit and with mine it just wasn’t off by a certain number of degrees, it just did what it wanted. I could set it at 88 and it would never come on, set it at 89 it was way to hot. It was all over the board. For about 10 bucks you could get a light dimmer and dial in the temps and at least have something going while you figure out the thermostat.
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