If your unit works anything like my heat pump here in Phoenix, turning the dial down with the switch set to Heater will do nothing. If the dial is set to 78f and the house is 83f, the heater figures all's well and stays off.

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I was just sitting here contemplating the immortal words of Socrates who said, "I drank what?"

"Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot." --Carl Sagan "Pale Blue Dot"