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Old 11-08-2014, 09:46 PM   #1
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Heat Pump

Tell me what I'm doing incorrectly. Currently 46* outside. 55* in the coach so I set the thermostat to 57* to get the HP to run. Turn the control to electric heat and I hear the generator give a little grunt. The HP "sounds" like it started but cold air is blowing out of the ceiling vents. Beginning at 55* interior temp, I raised the thermostat incrimentally by 1*. No change. At a thermostat setting of 60*, the gas furnace kicked on. I'm at a loss. Any ideas?
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Old 11-08-2014, 10:18 PM   #2
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Well, I can see that first off the furnace is kicking on because of temp spread between room temp and thermostat setting (it's supposed to). Should be temporary, then switch back over to HP. Did you give it some time?
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Old 11-08-2014, 10:19 PM   #3
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46 degrees is approaching the threshold where the heatpumps cannot heat very well, and it would feel like cold air coming out. Hopefully someone more knowledgeable will chime in soon!!
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Old 11-08-2014, 10:24 PM   #4
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The furnace only came on after I manually raised the thermostat setting to 60* (5* above an interior temp of 55*). Are you saying that I should have waited for the furnace to shut off, by itself, after it came on at the 60* mark?
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Oh...I forgot the five kids.
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Old 11-08-2014, 10:28 PM   #5
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Well, the way I understand it, if there is a 5-10 degree difference between the temp and the desired temp, then the furnace will kick on to rapidly heat the coach, then shut off automatically and the heatpumps will resume. I would give it time and see if that is what happens.
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Old 11-08-2014, 10:29 PM   #6
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FWIW on the efficiency of the HPs at colder temps outside; we have not yet used the furnace, and we HAVE had some 40's temps... so far they can handle it. In fact, we are only using one and it's doing good.
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Old 11-08-2014, 10:41 PM   #7
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Cindy and Tom, Toby and Kasey (our Berner and Newfie)
Oh...I forgot the five kids.
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Old 11-09-2014, 01:49 AM   #8
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The HP will not be instant heat & it takes awhile to displace the cool air in the ducts, it may take several minutes, but they work great to about 40+/- degrees.
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Old 11-09-2014, 03:59 AM   #9
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My experience last winter in FL with our 36re was HP down to 40. Below that the furnace. If you start with the heat pump at 45 ambient, it will take awhile to heat. And as said, a setting 3-5 deg higher than ambient the furnace will come on.

Mark
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Old 11-09-2014, 12:17 PM   #10
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The HP on our coach works well to just above 40, after that it just blows cold air. In the 40-45 range it isn't as warm as it is above 45 so that may be what you are experiencing. We went to bed last night with the HP on, the outside temp was ~46 and all was well, woke up this morning the outside temp was 38 and the HP was blowing cool air, the inside temp was down but not more than 5 below the thermostat temp so the furnace had not engaged.

Any time the thermostat is set more than 5 above the ambient temp the furnace will engage so if you want to avoid you have to raise the temp on the thermostat slowly, 1-2 degrees at a time.
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