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Old 10-19-2020, 11:40 AM   #5
DutchmenSport
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Join Date: Oct 2018
Location: Anderson
Posts: 2,544
M.O.C. #22835
I think what you are experiencing is pretty normal. We keep a separate indoor-outdoor thermometer beside the thermostat to compare the actual temperature with the setting at the thermostat. And like you, there is a much wider variance with the heat pump than with the furnace. In fact, in order to achieve the same temperature, (say 71 degrees), the furnace has to be set to about 73, whereas the heat pump has to be set to about 78. Then the temperature inside stays about the same.

Now, when the outside temperature nears 40-45 degrees, the heat pump begins to fail. It just can't keep up, and by the time the outside temperatures reach 40 or below, the heat pump quits blowing warm. Heat pumps have a very limited range. Above 45 they work pretty good. Below 45 and they start blowing cooloer and cooler air, until it just blows nothing but cold air.

My heat pump works best when the outside temperatures range from about 50 to 70. Above 70 and it will roast you out. Below 50, and that "variance" gets bigger and bigger until it just won't throw heat at all.

And an FYI, we keep the indoor-outdoor thermometer right at the thermostat because our camper has such an inside temperature variation, its insane.

The thermometer may read 71 degrees, but the upper living room (front living room model with no wall between the lower level, may be 80 degrees and the lower level at the themometer will be 71, and the bedroom (at the end of trailer) may be 65, and the bathroom 85. (This is with the propane furnace running).

On the heat pump (in the front of the trailer), the upper living room area is warmest, the kitchen (middle area on the main floor) is next, the bedroom (even with the door closed) is third, and the bathroom is the coldest.

On air conditioning, with both air conditioners running, the bathroom is the coldest room if the door is closed, and the kitchen is second coolest. The bedroom can turn into an ice box and the front living room a sauna if only the back (bedroom) air conditioner is running in 90 degree weather outside.

Finding a happy medium in all locations in the camper just takes time to figure out.

Hope this helps some.
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