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Old 11-16-2018, 07:12 AM   #1
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Coachmen Rear Heat Pump No Furnace

Have a new Coachman Mirada 32SS with front and rear heat pumps. There is only one propane furnace in the unit. It is connected as the alternate source to the front unit. My question is, how does the rear heat pump operate as far as when the thermostat is calling for the gas heat? The thermostat in the rear is the same as the front. Thanks for the feedback.
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Old 11-16-2018, 08:28 AM   #2
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Not familiar with your specific coach but most of them have common ducts that service both areas. The usually send more air to the area they are in, but some goes to the other area also... Had two heat pumps in my Newmar, and I'd usually set the front one lower or higher, for nighttime, and that would keep the little bit of noise further away from sleeping areas...
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Old 11-16-2018, 08:37 AM   #3
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from WA State.

You have two thermostats? All my rigs have had one central thermostat with zones to chose from. On them they would automatically turn off the heat pumps and switch to the furnace when the temps got too low for the heat pumps to run efficiently.
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Old 11-16-2018, 01:59 PM   #4
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Quote:
Originally Posted by Mr_D View Post
from WA State.

You have two thermostats? All my rigs have had one central thermostat with zones to chose from. On them they would automatically turn off the heat pumps and switch to the furnace when the temps got too low for the heat pumps to run efficiently.

The thermostat I had, had two zones. A front zone and a rear zone. I would think if you have two heat pumps that they should have two zones or two separate thermostats. In any case, even if I had the bedroom zone turned off, I would get a little residual heat/cool through the common ducts...
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Old 11-18-2018, 10:28 PM   #5
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Your heat pump ducts are in the ceiling and your furnace ducts are in the floor. They are 2 separate standalone systems. If you are using your propane furnace, which is controlled by the front thermostat, you should just leave the rear unit off. If you have the power available and it is not too cold out, then use the heat pumps as it will be cheaper than propane. My heat pumps will produce reliable (albeit noisy) heat as long as it is above freezing.

If relying solely on the heat pumps for heat, you may want to consider a heat source for your wet bay and water/gray/black tank area as your propane furnace heats that area, but your heat pumps do not. I use a small (250 watt) electric heater connected to a thermostatically controlled outlet set to ~40 degrees in mine.

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Old 11-20-2018, 05:18 AM   #6
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Thanks. How do I access the wet area to add the little heater? Also I appear to have a problem with the rear thermostat. When I set the rear thermostat to elec heat, nothing happens. When I set it to gas then the elec heat kicks on. Seems backwards. Have you experienced anything similar? Thanks.
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Old 11-20-2018, 07:34 PM   #7
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I have not had any problems with my thermostats. My first winter, I ran an extension cord through the hole where the sewer drain hose goes. I connected a programmable thermostat to the extension cord and the small electric heater to it. Since then I have hard wired an outlet in the storage bin opposite the wet bay and use it.

https://www.amazon.com/gp/product/B0...ilpage_o07_s00

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