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Old 10-06-2021, 03:28 PM   #1
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2021 25' Flying Cloud
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Heat pump

Can anyone explain what the “heat pump” thermostat setting does comparing to the “furnace” setting?
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Old 10-06-2021, 03:30 PM   #2
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High level, the heat pump uses a heat strip in the roof-mounted air conditioner unit to provide heat through the same roof vents as the air conditioning. It requires 120V AC power to work. It only provides heat when the ambient temperature is above 45 degrees or so.

The furnace setting uses your gas furnace. It blows hot air through the lower vents, and in many models it blows hot air on your holding tanks. It uses propane, and it can operate without 120V AC by using 12V DC power to run the fan.
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Old 10-06-2021, 03:52 PM   #3
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IMO the furnace is also quieter
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Old 10-06-2021, 04:32 PM   #4
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Quote:
Originally Posted by Bartek View Post
Can anyone explain what the “heat pump” thermostat setting does comparing to the “furnace” setting?
In modern Airstreams the A/C is also a heat pump. Basically it runs the opposite of cool. It takes heat out of the air and sends it to your vents. If you're plugged in and paying for power, it makes sense to use the heat pump. On furnace, you're using your propane for heat.
The downside of the heat pump is it doesn't work very well below 35 deg. So our smart thermostats have a secret program that at a predetermined temperature, switches from heat pump to furnace.
Heat pump air exits at the ceiling, while furnace heat exits at the floor making for toasty feet in the morning. In either case, I'd run a fan to move air around.
You will notice with the HP that the condensate will run off the roof and not down the drain tubes like with cool. It's all because the unit is running in "reverse".
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