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Old 09-20-2020, 11:39 PM   #1
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Join Date: Sep 2020
Location: Glendale
Posts: 3
M.O.C. #27142
Hello from Arizona

My wife and I just purchased a barely used 2020 Montana 3931FB and completed our maiden voyage to a nearby KOA, all of 60 miles from home. All went well but thought the rig could have gotten a little colder. The temps in Arizona are now in the low 100's. We set our thermostats at 78 but were only able to reach that in the bedroom, the living area hovered around 80 until the sun started going down. I guess the difference is due to the Heat Pump versus AC unit. Anyways, my wife is still working 3 days a week and plans to retire at the end of this school year. We bought this rig to see the rest of the country and plan to starting next summer. Until then, we'll probably stick to the states near us and go out for a week or two at a time. We've been RV'ing for a couple of years now and are in the process of selling our 2014 Keystone Laredo 312RE.
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Old 09-21-2020, 06:26 AM   #2
Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,164
M.O.C. #12156
Welcome and safe travels
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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Old 09-21-2020, 07:46 AM   #3
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Join Date: Jun 2011
Location: Wilsey
Posts: 17,546
M.O.C. #11455
Welcome to the forum! There are many things some of us have done so we get cooler. For instance in our 2017 we have cut every other fin off the supply vents, inserted PVC pipe in the return air vents (probably something you won't have to do because they were supposed to have fixed that now), replaced filter material and clean them every two weeks, added exterior window shade material, and added a third AC unit.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
2017 3500 Dodge Maxi DRW 4X4, Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, etc.
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Old 09-21-2020, 09:39 AM   #4
Montana Man
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Join Date: Jun 2018
Location: Lemoore
Posts: 1,215
M.O.C. #21963
Welcome and nice rig you got there. We are five feet shorter than you and our AC can't keep ahead of that Arizona heat either. They just don't put enough cooling horsepower in them. If you have vents under the steps in the hallway, I would block them if heat is coming in from there. Otherwise the best thing for us is to shade the sunny side the best you can. It is the direct sunlight that gets us. The walls, windows, and window frames pass a lot of heat. Although the inside shades help some, the heat is already inside by then.
2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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Old 09-21-2020, 11:24 AM   #5
Dam Worker
Montana Master
Join Date: Mar 2015
Location: West Richland
Posts: 1,177
M.O.C. #17164
Welcome to the Forum and enjoy your new Montana. Cooling your unit can be hard to do. As stated before the dark colored exterior walls don’t help us. I will say having the double Paine windows help out a little bit and being in any shade makes a big difference. It is much harder to bring the temperature down compared to maintaining it. I will sometimes also bring the temperature down lower at nighttime or early morning as I know my inside temperature will go up with the heat gain of the day. I really wish that they could make a better insulated unit even if the weight increased marginally.

Tom Marty
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Old 09-21-2020, 01:11 PM   #6
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Join Date: Nov 2012
Location: Rancho Santa Margarita
Posts: 555
M.O.C. #13025
I put this in all the windows and it helps alot. I cut them to size and put them in the windows on real hot or cold days.

Russ and Linda, So. California
2004 Chevy Silverado 2500 HD, D/A, SRW, SB
2005 2955RL, Pullrite Superglide 16K hitch. Bridgestone Duravis R500 tires. EZ Flex Equilizers with wet bolts.EMS HW50C
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Old 09-21-2020, 01:25 PM   #7
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Join Date: Feb 2020
Location: St Brendan's Isle
Posts: 114
M.O.C. #25842
We painted the outside of the clear bathroom skylight white with plastic safe paint. Made a world of difference in there. Adding Rain covers to the MaxxAir fans also made a big difference. When possible we point the rig east and run the awnings out just far enough to shade the windows from direct sun.
2020 3121rl
2018 F-350 6.7 DRW
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Old 09-23-2020, 02:14 PM   #8
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Join Date: Sep 2020
Location: Glendale
Posts: 3
M.O.C. #27142
I appreciate all the advice. The previous owner was a little OCD and had insulated everything that you could think of, skylight in the bathroom, vents under the stairs, all the windows with reflective insulation, etc. Since we had our worst heat in Arizona this year with 50+ days over 110 I think I'll start saving for a 3rd AC unit. The brochure I have says that I'm wired and framed for a 3rd unit. I called the closest Keystone service center and got a quote of no more than $3,500. I guess my next question will surround what unit to buy and who should I have install, since I'm not good with heights... :-)
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