Montana 3761FL

[Todd & Mary]

on our 2021 the front AC is the heat pump, the front thermostat also controls the furnace. Rear is only cool. Both units seem to be ducted together in the ceiling. A least mine is.

[c2itcliff]

Yes, both AC units share same ducts. Of course the propane furnace is ducted separately in the floor and is also used to heat the water system in the floor cavity in freezing temps.

[seminolecoop]

The front ac has the heat pump, electric heat on the thermostat. If it's below around 40 degrees outside my gas will come on first, even on electric heat mode.

[TripleP]

Thank You

[Drewman]

I have a 2021 3761FL and it is the front unit for me. Use the thermostat that has electric heat as an option. Turn up the temperature on the thermostat and see which unit turns on.

[Todd & Mary]

We installed a Micro air thermostat on our front AC unit. I have found it will start both the furnace and Heat pump if I turn the temp more than 4 degrees at a time. I think that is the safety, if the heat pump cant keep up and the temp drops more than 4 degrees below setpoint it will run the furnace.