Originally Posted by Chris82
Question about the dometic thermostat.
During our pre-buy, the tech said to run the fan on auto. He said leaving it on low or high could cause the heat and AC to run simultaneously.
This is partially correct.
In heat mode, if fan is on hi or low, the AC fan (fan only not compressor) runs to improve circulation.
In AC mode, if fan is on hi or low, the AC fan runs continually and compressor turns on and off as needed. The furnace fan does not run.
Attached is manual