Thread Tools Search this Thread Display Modes
Old 01-07-2014, 06:58 AM   #1
Rivet Master
VeggieBullet's Avatar

1973 31' Sovereign
2007 20' Safari SE
Vintage Kin Owner
Wesley Chapel , Florida
Join Date: Oct 2011
Posts: 879
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
VeggieBullet is offline   Reply With Quote
Old 01-07-2014, 07:05 AM   #2
Rivet Master
SteveH's Avatar
2005 39' Land Yacht 390 XL 396
Common Sense , Texas
Join Date: Sep 2007
Posts: 5,282
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.


"To compel a man to subsidize with his taxes the propagation of ideas which he disbelieves and abhors is sinful and tyrannical."-- Thomas Jefferson
SteveH is offline   Reply With Quote
Old 01-07-2014, 08:06 AM   #3
Rivet Master
bwoodtx's Avatar
1997 30' Excella
1961 26' Overlander
1954 22' Flying Cloud
1981 28' Airstream 280
San Antonio , Texas
Join Date: Jul 2009
Posts: 1,269
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.
WBCCI# 9259 AIR# 38927 TAC-TX 14
Stop Littering-Spay & Neuter-- Adopt From Rescue
He is your friend, your partner, your defender, your dog. You owe it to him to be worthy of such devotion.
bwoodtx is offline   Reply With Quote
Old 01-07-2014, 08:27 AM   #4
Rivet Master
dznf0g's Avatar

2007 30' Classic
Oswego , Illinois
Join Date: Jul 2010
Posts: 8,189
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.

"If the women don't find you handsome, they should at least find you handy." - Red Green
dznf0g is offline   Reply With Quote
Old 01-07-2014, 10:07 AM   #5
Rivet Master
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,592
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.
idroba is offline   Reply With Quote
Old 01-07-2014, 10:18 AM   #6
3 Rivet Member
1972 21' Globetrotter
Wylie , Texas
Join Date: Oct 2013
Posts: 140
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?
rippie is offline   Reply With Quote
Old 01-07-2014, 02:12 PM   #7
4 Rivet Member
blickcd's Avatar
1979 31' Sovereign
Milford , Ohio
Join Date: Jan 2005
Posts: 410
Images: 1
Blog Entries: 29
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.

When life gives you lemons, don't make lemonade. Go get the oranges that you really want.
blickcd is offline   Reply With Quote
Old 01-09-2014, 06:03 PM   #8
hang up and drive
kry226's Avatar
2010 30' Classic
:) , Germany
Join Date: Jan 2011
Posts: 211
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.

2004 Dodge Ram 2500 5.9L Cummins 4WD (SOLD)
2010 Classic 30
ProPride P3-1400
kry226 is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:26 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.