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01-07-2014, 06:58 AM
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#1
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Rivet Master
1973 31' Sovereign
2007 20' Safari SE
Vintage Kin Owner
Wesley Chapel
, Florida
Join Date: Oct 2011
Posts: 886
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Heat Pump - How cold its too cold?
Doing a little google search it seems like:
...Every system has a balance point based on unit capability to reach desired temp indoors with a given outdoor temp..
And also saw some inputs that the heat option for the heat pump will not work by low 40s or mid 30s.
Wondering about about that.
Got a Coleman Polar-Mach 15 heat pump 15Kbtu and now is 31 and the heat pump its on but don't really feel a really hot air coming out of the unit..
__________________
Still One Nation under GOD
2 chronicles 7:14
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01-07-2014, 07:05 AM
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#2
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Rivet Master
2005 39' Land Yacht 390 XL 396
Common Sense
, Texas
Join Date: Sep 2007
Posts: 5,319
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I've used ours to the lower 30's, but not freezing. It is not as efficient at those temps, and spends some time in defrost mode (compressor running but not the fan), but it doesn't seem to hurt it.
If it's going to approach freezing or below I use the furnace. But I figure whenever I can, I'll use the park's nickel.
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Regards,
Steve
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01-07-2014, 08:06 AM
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#3
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Rivet Master
1997 30' Excella
1961 26' Overlander
1954 22' Flying Cloud
1981 28' Airstream 280
San Antonio
, Texas
Join Date: Jul 2009
Posts: 1,436
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In our 31' we supplement the heat pump with a ceramic heater in the bedroom and one in the galley area. Keeps the trailer toaster down to the 20's with no problems.
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Bruce
WBCCI# 9259 AIR# 38927 TAC-TX 14
Stop Littering-Spay & Neuter-- Adopt From Rescue
No amount of time will erase the memory of a great dog.
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01-07-2014, 08:27 AM
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#4
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,669
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Mine switches over to the furnace at about 35*. Above that it puts out plenty of heat. It will defrost cycle below about 40*, depending on outside humidity.
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-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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01-07-2014, 10:07 AM
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#5
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Rivet Master
1974 Argosy 20
2014 20' Flying Cloud
Kooskia
, Idaho
Join Date: Jul 2009
Posts: 4,591
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The new one on my FC 20' seems to work well down to the mid to upper 20's, however the older ones don't work much below the mid 30's, so it depends on the unit and how it was made. RV units are notoriously designed down to a price and are not nearly as efficient as heat pumps can be made.
I have a new mini split heat pump in my home and it heats at full capacity down to 15 F and 92% capacity at 5 F. It is also about 30 to 40% more efficient in power used than the one in the Airstream. It is unfortunate that the "free" electricity in a campground mentality has allowed RV AC and heat pump manufactures to produce inefficient units with marginal quality.
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01-07-2014, 10:18 AM
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#6
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3 Rivet Member
1972 21' Globetrotter
Wylie
, Texas
Join Date: Oct 2013
Posts: 140
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I purchased an Atwood 15000 in September, despite the naysayers of "won't cool under 40 degrees." My reasoning was that I was getting it more for the air conditioning anyway. My climate sees relatively little time below freezing.
I have been pleasantly surprised. While maybe not as efficient, I have been getting heat and been comfortable below freezing temps. I previously expected the unit would just mock me and play recorded messages like "they told you so" instead when it got "too cold."
But, unfortunately, I can't say much for reliability at this point as I am already having it replaced (under warranty) for an "insufficient refrigerant" error message. So maybe all that warmth took it's toll?
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01-07-2014, 02:12 PM
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#7
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Rivet Master
1979 31' Sovereign
Milford
, Ohio
Join Date: Jan 2005
Posts: 565
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I have a Carrier AirV heat pump and around 40 degrees the compressor shuts down and an electric heat strip automatically kicks in.
It will keep the trailer in the high 60's when it is below freezing but the air blowing out the vents is not really warm so you don't want it blasting on you while you are on the sofa.
Sorry to say that Carrier no longer makes these. However, when I have to replace it, I will look for another heat pump with an electric strip heater, and not one that defrosts.
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Christopher
Its a camper, therefore it leaks.
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01-09-2014, 06:03 PM
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#8
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hang up and drive
2010 30' Classic
Carlisle
, Pennsylvania
Join Date: Jan 2011
Posts: 238
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We've used ours down to the lower 30s as well. They seem to freeze up shortly after that. But we've been happy with their output otherwise. However, we have yet to witness this automatic changeover to the furnace that many speak about.
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Kyle
2023 Ford F350 Lariat 7.3/4.30 FX4 CCLB
2010 Classic Limited 30
ProPride P3-1400
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