My coach has an optional heat strip in the AC unit. Works fine but will typically get too hot during the night. I purchased a line voltage thermostat which is nothing more than a thermostatically controlled switch. Two wires. Cut the hot wire to the heat strip and splice this in line. On my coach the hot wire is the black wire in the three conductor plug. Its two wires so once you cut the wire, you just splice each end to the thermostat. Works great and the whole thing only took about an hour.  I put it in the ceiling near the fresh air intake to the AC unit. Should get a good reading there but we\'ll have to calibrate what is \'comfortable\' for sleeping. These things are about 20 bucks.
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