When set on heatpump only the heatpump operates until the outside temp get to below 32. Then the furnace will automatically kick in. My experiance is that the one heatpump we have will keep the coach at the set temp down to 32 degrees.
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Dave & Barbara
KenWorth T2000
2005 Mobile Suites 38RL3 #2338
MorRyde IS 8K axles, LazyBoy recliners, LCD tv
Full time since '96
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