Thread Tools Display Modes
Old 10-06-2014, 05:57 PM   #1
Senior Member
Join Date: Jun 2014
Posts: 230
Why does the CoolCat stop making heat at 40 degrees?

When it happened I switched over to the propane furnace, as instructed in the owner's manual.

All the same, I am wondering why 40 degrees, +/- 2 degrees, is the bottom limit?

mickrock is offline   Reply With Quote
Old 10-06-2014, 06:04 PM   #2
Senior Member
B and B's Avatar
Join Date: Jun 2013
Location: Wilmot Twp, Ontario, Canada
Posts: 9,139
The Air to Air heat exchanger is not that efficient. The coils are not big enough to extract much heat. You could use a fireplace or portable ceramic heater to save on propane. I had a Carrier heat pump that used more electricity below 0 than using electric heat.

2017 Heartland Bighorn 3575 Elite with Reese Sidewinder
2016 Ford F 350 SD PS 6.7 SRW Crew Pucks and Reese 18 K Elite

2013 Rockwood 8289WS 2012 Rockwood 2703 SS TT 2007 Golden Falcon 38FLA PM 1983 Corsair 21RB
2015 Ford F250 PS '13 F150 3.5 Eco '09 F150 5.4 l 1987 Merc Grand Marq 1982 Ford E250 CW
B and B is online now   Reply With Quote
Old 10-06-2014, 08:04 PM   #3
Senior Member
Join Date: Apr 2012
Location: South Carolina
Posts: 1,264
All heat pumps will frost over the outside coil when the outside temperature approaches freezing. They have to run in defrost mode part of the time to get rid of the ice. We have a Dometic Brisk Air 15,000 btu/hr heat pump/ air conditioner on our 2011 Class C Sunseeker.

The instructions for the thermostat says that below 40 F outside temperature it will periodically run in defrost mode, during which the compressor runs to heat the outside coil, but the fan doesn't run because it would be blowing cold air. Below 30 F the thermostat will shut off the heat pump and run the furnace, even though heat pump is selected. Newer coaches use a different thermostat, from our 2011 year model, but they probably work the same way.

Maybe the instructions for your thermostat explains this sequence of operation for your unit. I had to get our instruction manual on-line.
RamblerGuy is offline   Reply With Quote
Old 10-06-2014, 08:20 PM   #4
Senior Member
Join Date: Mar 2013
Location: Houston, TX
Posts: 1,745
All heat pumps suffer from low efficiency at temps near freezing and stop working at some point. There is just a limit to when heat that can efficiently be drawn from cold air. Much like an air conditioner would stop cooling if the outside temps were near the temperature of the compressed refrigerant. The home heat pump we once owned had a electric coil backup. We AFrame owners have gas furnaces.

2012 Rockwood A122S
2008 Toyota Tundra Double Cab 4X4

Former owner of a 2002 Coleman Niagara GTE
Pooneil is offline   Reply With Quote


Thread Tools
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

» Featured Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 10:23 PM.