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03-14-2024, 07:52 AM
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#1
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Established Member
Join Date: May 2023
Location: Sykeston
Posts: 31
M.O.C. #32705
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Heat pump
Been trying heat pump, outside temps have been in the 40’s. Thermostat set to 68 never wants to shut off very little air movement at vents ! Going to try leaving ceiling fan on overnight.
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03-14-2024, 08:37 AM
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#2
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,236
M.O.C. #30417
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Quote:
Originally Posted by Jamric
Been trying heat pump, outside temps have been in the 40’s. Thermostat set to 68 never wants to shut off very little air movement at vents ! Going to try leaving ceiling fan on overnight.
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It would be helpful if you provided your year and model. I have to assume that you have a late model since you have a heat pump. Low air flow, if you have the Keystone blade vents that would explain the low air flow. I changed all of mine back to the old style louver vents. Much better air movement. As far as the heat pump. It's not meant to heat the whole trailer, it can't. I use it as a supplement to the fireplace. I also turn on the ceiling fan.
__________________
Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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03-14-2024, 09:13 AM
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#3
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Montana Fan
Join Date: Nov 2020
Location: Gulfport
Posts: 105
M.O.C. #27628
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A couple of things to check for airflow; 1) remove each vent and use foil tape to seal so no air leak into ceiling space; 2) remove return air vent and make sure opening is as large as the grill. Also tape.
I found an improvement in the air flow after doing this.
I also use fireplace and ceiling fan pulling air up to circulate helps.
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2021 Montana 3231CK, Legacy, Super Solar Flex, Dual Pane Windows, Slide-out Awnings
2021 Dodge RAM 3500 4x4 Limited 6.7 HO DRW, Trailer TPMS, B&W Companion Hitch
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03-14-2024, 09:57 AM
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#4
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,470
M.O.C. #23668
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Your heat pump should perform well in those temps. We have found the heat pump to work quite well. It heats more slowly than the gas furnace but is effective all the same. Ours heats the whole coach well...especially the high ground, ie: the upstairs bed and bath.
DW doesn't prefer it since she feels that the HP is louder than the furnace. They seem about the same to me.
As stated, if you've made sure that you are receiving the best flow possible by making sure the ceiling vents are properly set and sealed, etc, then it should work well.
In ours I used a boroscope to check the ceiling ducts as well to make sure they were as open as they could be.
Ours has the whisper quiet install so I don't have any visibility from the interior to how the AC/HP is sealed to the roof and how well the intake/outtake vents are separated and sealed. That can also have a huge effect on air flow and efficiency. If you can, pull down the plenum cover and take a look.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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03-14-2024, 11:02 AM
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#5
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Established Member
Join Date: May 2023
Location: Sykeston
Posts: 31
M.O.C. #32705
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2022 3221 rl
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03-14-2024, 11:04 AM
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#6
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Established Member
Join Date: May 2023
Location: Sykeston
Posts: 31
M.O.C. #32705
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Has round vents , do they just snap out ?
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03-14-2024, 04:22 PM
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#7
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Established Member
Join Date: May 2023
Location: Sykeston
Posts: 31
M.O.C. #32705
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Heat pump / ac vents
Glad I did some research, 2022 3121 rl the air diffusers can actually cut off air flow if turned the wrong direction! The lettering on the diffuser itself should be opposite of the ac unit! Guessing it why heat pump is heating bedroom/ bathroom more ! Yeah I know heat rises .
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03-14-2024, 05:10 PM
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#8
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,236
M.O.C. #30417
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Quote:
Originally Posted by Jamric
Glad I did some research, 2022 3121 rl the air diffusers can actually cut off air flow if turned the wrong direction! The lettering on the diffuser itself should be opposite of the ac unit! Guessing it why heat pump is heating bedroom/ bathroom more ! Yeah I know heat rises .
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They still suck 
__________________
Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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03-15-2024, 12:17 AM
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#9
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,141
M.O.C. #25165
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One additional thing I did other than the tape mentioned above is to put short sections of 1 1/4" PVC pipe inside the ducts at each vent opening. It helps keep the duct from crushing flat and restricting the air flow. In several places I noticed that the duct had flattened to an opening of less than 1" high.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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03-15-2024, 07:07 AM
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#10
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Montana Fan
Join Date: Feb 2022
Location: Cynthiana
Posts: 199
M.O.C. #30449
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How was the air flow when you were running AC? It's the same blower running the same speed when you're running heating.
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03-15-2024, 08:05 AM
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#11
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,701
M.O.C. #24086
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Older model Dometic heat pumps don't work below 40⁰F. I'm not sure about the new Coleman units.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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