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Old 12-04-2018, 10:05 AM   #1
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2015 Forester 3011 DS - Dometic A/C Heat Pump and Furnace Operation

I would like to optimize the heat pump and furnace operation. My Dometic thermostat is the single zone with the Fan/Cool/Furnace/Heat Pump setting. I have used the rv 3 of 4 weekends October and November some with pretty chilly nights. When running on the furnace setting, my heat pump will run (I think it is on fan, as the air is cool) I thought to help circulate the furnace produced heat. More efficient?
First, is this typical of this combination setup?
Seconly, I saw at a camper show, many companies are goint to a digital based thermostat. Is this a good choice to change over to that technology. I can attest that the Trane digital in my home system is better than the old systems.
Thanks for any comments!
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Old 12-04-2018, 11:35 AM   #2
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On my Sunseeker, the fan must be set on auto for the furnace to work. If it's on low or high the heat pump runs and it won't heat beyond a low temp.
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Old 12-04-2018, 11:58 AM   #3
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The Dometic single zone thermostat, uses their proprietary digital communication between the thermostat and A/C control box, so you can't easily or cheaply replace it with another brand.
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Old 12-04-2018, 12:03 PM   #4
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Quote:
Originally Posted by Ngeorgiacamper View Post
I would like to optimize the heat pump and furnace operation. My Dometic thermostat is the single zone with the Fan/Cool/Furnace/Heat Pump setting. I have used the rv 3 of 4 weekends October and November some with pretty chilly nights. When running on the furnace setting, my heat pump will run (I think it is on fan, as the air is cool) I thought to help circulate the furnace produced heat. More efficient?
First, is this typical of this combination setup?
Seconly, I saw at a camper show, many companies are goint to a digital based thermostat. Is this a good choice to change over to that technology. I can attest that the Trane digital in my home system is better than the old systems.
Thanks for any comments!
Yes, by design your heat pump fan will run in furnace mode to help circulate the warm air if the fan is set on low or high. I don't like it and set mine on auto so it won't come on.

Please post a photo of your thermostat and hopefully someone with your type will be able to help.

Our 2017 Forester has a digital thermostat. Setting the fan mode to AUTO when using the furnace prevents the roof unit fan from running. If you are able to choose your fan mode with your current thermostat you might try that, if you haven't already, to disable the heat pump fan while using the furnace.

Another great feature we discovered is if the temperature drops too low for the heat pump, when the fan is set on auto, the mode automatically switches to furnace.

I'm attaching a photo of what we have. Maybe someone can tell you if it's an easy direct replacement or not as a two model year difference may have different control components. I am told there is a newer model that has bluetooth capabilities.

If you call Dometic with your heat pump model, serial number and thermostat info they may be able to help if you don't find it on the forum.
Good luck.
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Old 12-04-2018, 01:04 PM   #5
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Thanks for the reply. Sorry, I was not real clear. I didn't mean that I wanted to replace with a different brand thermostat. I would like to have the control to run the heatpump fans, the thermostat I currently have (attached), I don't think I can manually control the fan while running the furnace. While the HP fan runs with the furnace blowing, it can a little drafty if sleep under a open duct. I saw Dometic now has a digital with bluetooth which I think may give the control that I might want, I guess I need to see about compatability with the control board?
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Old 12-04-2018, 01:51 PM   #6
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All you have to do is put the Fan control on "auto", and it will not come on when you run the gas furnace.
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Old 12-04-2018, 01:51 PM   #7
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A Heat Pump by itself will only give warmth when outside temps are about 45 degrees. Outside temps below that 45 degrees or if it's just not toasty enough most Heat Pumps in your house have an Aux Heat that kicks in whether gas or electric to supplement. I don't know if RV's have that Aux or Boost heat element in electric or gas or if they want you to use your furnace also. Atlanta is about as far north as Heat Pumps by themselves are effective and even then the Aux has to kick on to keep momma happy!
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Old 12-04-2018, 02:05 PM   #8
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Just came back from my trip where temps got down to 29* had thermostat set on heat pump and 70* and the heat pump keep MH comfortable where heat pump would cycle off when temps inside reached degree set. No time did furnace kick on.
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Old 12-04-2018, 02:23 PM   #9
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According to what I have learned about my Sunseeker, only the gas furnace feeds heat to the basement storage areas where there are plumbing pipes, etc.
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Old 12-04-2018, 02:25 PM   #10
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Originally Posted by Dcbenny View Post
Just came back from my trip where temps got down to 29* had thermostat set on heat pump and 70* and the heat pump keep MH comfortable where heat pump would cycle off when temps inside reached degree set. No time did furnace kick on.
If control is set on"heat pump", gas furnace will not come on.
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