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10-08-2022, 01:15 PM
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#1
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Seasoned Camper
Join Date: Jan 2022
Location: Ashland
Posts: 64
M.O.C. #30303
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Heating and AC
We took our 2021 3761FL on our first cold hunting trip. I wanted to ask about the functionality of the heating and air systems. Our main section is galley and living room. This thermostat has AC, and heating with gas and electric. Our MBR thermostat just has AC. I turned the electric heat on and didn’t feel much coming out of floor registers. Then I turned to gas heat and feel warm air except from the MBR bath and one in the kitchen. These two had no warm air coming out. Do the roof units act as heat pump with hot and cold? And is the furnace just come out of the floor registers including in the MBR areas?
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10-08-2022, 01:50 PM
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#2
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Montana Master
Join Date: Dec 2021
Location: Northeast TX
Posts: 946
M.O.C. #30262
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That is correct Tree Top. Only the rear AC unit should have a heat pump and provide some warming air through the coach upper vents, whereas the furnace should blow nice toasty air through the floor ducts throughout the coach.
If you have floor registers with no air at all being provided, it sounds like time to look in the basement behind the aft bulkhead of the baggage compartment to look for a loose or pinched off heater duct.
Hope this answered you questions....
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Lee, Edith, Lil' Bit & Cuddles
22 MHC 331RL, Surge Guard 35550, SumoSprings, Kodiak disc brakes, 412Ah Lithium, Gen 3 Goosebox, Sailun 85s
22 Ram 3500 CC DRW 6.7 CTD Herrin Hauler Classic Bed, 45 gal AUX tank
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10-08-2022, 02:53 PM
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#3
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Seasoned Camper
Join Date: Jan 2022
Location: Ashland
Posts: 64
M.O.C. #30303
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Thank you
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Thanks
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10-08-2022, 04:09 PM
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#4
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Montana Fan
Join Date: Apr 2021
Location: everywhere, USA
Posts: 281
M.O.C. #28634
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our 2021 3761FL
Actually our 2021 3761FL has the heat pump on the front unit and the rear is AC only. But they are both ducted together so the heat pump will supply some heat to the rear of the rig as well. we have had good luck with the heat pump working down into the upper 30, even though they say it will not heat under middle 40's.
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2021 Montana 3761FL, 9 LIFPO4 batteries & 1700 watts of panels w/ Multiplus II 3K inverter and 30amp DC to DC charger from truck. 8k Dexter axles w/ Kodiak disc brakes.
2019 6.7 diesel F350 DRW with Banks derringer and 4"exhaust, airlift bags, 25k B & W Companion hitch, 45 gal. aux. diesel tank and 14k Winch, just in case!
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10-08-2022, 04:22 PM
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#5
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Montana Master
Join Date: Dec 2021
Location: Northeast TX
Posts: 946
M.O.C. #30262
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Quote:
Originally Posted by Todd & Mary
Actually our 2021 3761FL has the heat pump on the front unit and the rear is AC only. But they are both ducted together so the heat pump will supply some heat to the rear of the rig as well. we have had good luck with the heat pump working down into the upper 30, even though they say it will not heat under middle 40's.
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Thanks Todd. I'm beginning to understand why it is difficult to be spot on when there are so many variances between specific models and year models. I don't know how some of the guys and gals keep up with current info as well as they do. Great thing we have and entire MOC family to draw knowledge from. Thanks again!
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Lee, Edith, Lil' Bit & Cuddles
22 MHC 331RL, Surge Guard 35550, SumoSprings, Kodiak disc brakes, 412Ah Lithium, Gen 3 Goosebox, Sailun 85s
22 Ram 3500 CC DRW 6.7 CTD Herrin Hauler Classic Bed, 45 gal AUX tank
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10-09-2022, 05:14 AM
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#6
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,150
M.O.C. #25165
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Just to throw another idea out there, I go to northern West Virginia every November/December for hunting season. If you can break the chill in your rig once set up, you can use electric heat and the heat pump pretty well down into the low 20's and even teens. The trick is to supply enough heat with supplemental electric heaters to keep the air circulating in the heat pump warm enough. I usually use the fireplace heater in the rear and a ceramic space heater in the kitchen.
It's certainly not "toasty" as I usually shoot for a temp around 60 inside the rig, but when it's 20-30 outside and you're dressed appropriately, it's quite comfortable.
I have remote thermostats in the belly, basement and rear garage to monitor for freezing pipes and tanks. I run the tank heaters constantly. It is very rare that the gas furnace will kick on, unless we get to single digits or lower.
I've used less than one 30 lb propane cylinder for the last 3 years and I spend 3 weeks up there during the winter.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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