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Old 08-19-2011, 08:33 AM   #1
charlie.leverett
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Dual A/C's - Trying to Keep Cool In Texas

I just purchased the Montana 3750 and here in my area (TX) the temp has been in the 100 + range for some time, it has dual A/C's but i still can only get the inside temp down to mid 80's during the hotter periods of each day, any suggestion or is something wrong?



(Moderator's Note: This and following 3 posts have been moved from New Member Welcome to Keystone Questions)
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Old 08-19-2011, 09:22 AM   #2
LarryL
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I think A/C will only cool 10 degrees below outside temp so your like to
to have 80 degrees.
if you go outside for a few minites and go back inside it will feel much
cooler
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Old 08-19-2011, 09:25 AM   #3
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Welcome to the forum. I'm sorry to say it but a 20° differential in a trailer without shade is just about normal. You can try getting it cooler in the early morning and hope it holds temp a little better. Keep cool, Hank
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Old 08-19-2011, 10:11 AM   #4
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If the temperature difference between the intake air and outflow is 15 degrees or better, your units are doing the best they can. Finding a shady camping spot is about the best thing you can do now.

If you search this board, you'll also find some threads on retaping your A/C ducts. That can help a little. Makes the existing units a little more efficient.
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Old 08-19-2011, 11:09 AM   #5
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Using fans in addition to the AC will help a lot.
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Old 08-20-2011, 05:51 PM   #6
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I got insulation, From Camping World last year. Cut it to fit the windows and helped a lot in Az last summer.
It looks like aluminum with ins. sandwiched and sewn like a quilt. Cut to fit windows,and it stops a lot of sun. and heat.
Works well in the cold also.
They carry 2 different size rolls. Larger one fits big windows in Slide-out and across the back.
I think I had to buy two large rolls, and a small one.
Measure the windows,footage is on rolls
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Old 04-07-2012, 08:05 AM   #7
fivergeezer
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I have a similar problem in Florida's heat and sunshine. I've used the foil window treatment but my wife doesn't like the dark cave-like atmosphere. I'm thinking window awnings and slide toppers, but finances won't allow this until next spring.
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Old 04-07-2012, 08:16 AM   #8
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fivergeezer -
I remember reading an article about slide toppers and their effectiveness in keeping the RV's interior cooler in hot weather. If my memory serves me correctly - which may be asking a lot) - slide toppers do little, if anything, to keep the inside temperature down. Unfortunately, I can't give you any factual reference but perhaps others can. If you are going to purchase toppers for the sole purpose of keeping the inside temps down, it might be worthwhile to do some research to find out if, in fact, they actually do work this way.
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Old 04-07-2012, 09:45 AM   #9
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Quote:
Originally Posted by Festus2 View Post
fivergeezer -
I remember reading an article about slide toppers and their effectiveness in keeping the RV's interior cooler in hot weather. If my memory serves me correctly - which may be asking a lot) - slide toppers do little, if anything, to keep the inside temperature down. Unfortunately, I can't give you any factual reference but perhaps others can. If you are going to purchase toppers for the sole purpose of keeping the inside temps down, it might be worthwhile to do some research to find out if, in fact, they actually do work this way.
Festus: In my opnion the slide toppers do help keep the interior cooler. I have felt the sidewalls in the slide in the direct sunlight, then the ceiling of the slide and there is definetly a noticible difference in temperature. Just my 2 cent worth. Happy Cool Campin.................Ron
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Old 05-16-2012, 11:35 AM   #10
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Insulation from Lowe's

I too, have my Alpine 3200RL in west Texas. We have already had ays of over 100 degrees. I bought the quilted insulation that was talked about in one ove the above post from Lowe's for $42.00 for the 4 ft. x 25 ft. roll. Cut them to fit all the windows and have no problem getting my RV down to 71 degrees. It sure made a big differance in the cooling. The local RV store wanted $75.00 for the same stuff.---Smitty
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Old 05-16-2012, 11:59 AM   #11
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The foil type insulation is great. We used it one summer on my pop up tent ends and it made a world of difference. I could see how it would work with the windows in 5er.
When we bought our 5er that one request I had, to get the extra AC. we got the 13.5K unit in the bedroom it is NOT ducted and we used twice last summer. First night I had to get under the covers to keep from being cold. I usually sleep on top of them, not the nights we ran the 2nd AC. IT worked fine in the SC hot&humid summer months. We got eh inside down to around 73/75. that was comfortable compared tot eh temps outside. the year before we had the TT with one 13.5K AC I think the best we saw it was 87 inside during the day the AC worked its behind off all day and might have cut off in the middle of the night. One morning it was hot as I was cooking breakfast, I told the wife we were going to go shopping and we stayed at the mall all day long. it got to 99 that day...
I hope you can get it working like you want it. I use a large fan also inside and outside to keep air moving. Keep the all doors closed, pull the shades if you don't go with foil type material.
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Old 05-16-2012, 12:14 PM   #12
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if I search for insulation on Lowes I will find it? We are already have 100 degrees here in Tucson
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Old 05-16-2012, 12:27 PM   #13
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Here's the link:

http://www.lowes.com/pd_13358-56291-...7C1&facetInfo=

it's $40.84 at our local Lowes.....
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Old 05-17-2012, 06:35 AM   #14
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Howdy All;

Quote:
Originally Posted by JRTJH View Post
Here's the link:

http://www.lowes.com/pd_13358-56291-...7C1&facetInfo=

it's $40.84 at our local Lowes.....
I thought I'd read something about using something like the reflectix (stuff mentioned in the quoted link), so I emailed the company...Here's the reply;

We do not recommend it on windows because there can be a heat build up that could cause the glass to crack.

Angelic Millspaugh
Reflectix, Inc.
Customer Service Rep.
Ph: 800-879-3645 ext. 148
Fx: 765-533-2327
"We are all of us stars, and we deserve to twinkle." -- Marilyn Monroe


Thought it warrented a small invistagion.

I think the foil that is refered to is like a window tinting 'film' that is stuck to the glass as a more 'permenant' solutionsuch as;

http://solutions.3m.com/wps/portal/3...ilm/Solutions/

Disclaimer... I don't work for or have any financial tyes to 3M....

hankaye
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Old 05-17-2012, 09:16 AM   #15
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so you think the foil would be ok, but don't go putting on the film? The windows are already tinted, but I was thinking of doing this too.

Did you all put it on the inside or fasten it to the outside (I know someone that did the outside). If inside then it is under the day/night shades correct?
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Old 05-17-2012, 09:50 AM   #16
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Quote:
Originally Posted by charlie.leverett View Post
I just purchased the Montana 3750 and here in my area (TX) the temp has been in the 100 + range for some time, it has dual A/C's but i still can only get the inside temp down to mid 80's during the hotter periods of each day, any suggestion or is something wrong?
The max. input/output temp differential for A/C units is around 15 degrees but that doesn't mean that the max temp differential between inside and out can never be more than 15 degrees. That said, the heat load on an RV on the sun is very high and it is not at all unusual for dual A/C's being unable to keep up in extreme conditions (which virtually defines Texas in the summer ) About all you can do is take some steps as described in the thread, and start up early in the day so you don't get too far behind the curve.
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Old 05-17-2012, 12:37 PM   #17
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I plugged those blasted roof vents with the thick foam with the reflectix to prevent heat gain through them. The difference is noticeable. I never camp without some shade available in Florida and my one 13.5k unit does fine with my 32' TT that is poorly insulated.
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Old 05-17-2012, 02:34 PM   #18
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Yes, I did put it between the day and night shades and the window.
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Old 05-17-2012, 02:40 PM   #19
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thanks a bunch. That sure would help the big window in the frontroom.
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Old 05-22-2012, 05:28 AM   #20
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We had the custom made solar screens that snap on the outside put on. Made a huge difference just standing by the large windows. Normally you could feel the heat radiating in from the glass not it doesn't feel like any temperature difference. Works for homes, works for my RV.
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