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Old 11-22-2021, 04:21 PM   #29
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Quote:
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Will 2 a/c units on 40' coach keep it cool enough in 90+ heat? John
Not really with all the slides out, since they never seem to shut down during the heat of the day, no matter where they're set, but as long as they're running it feels cool for the most part.
No complaints actually.
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Old 11-22-2021, 11:01 PM   #30
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We spent the better part of two years in central Texas, including the summers of ‘19 and ‘20. May to Sept every day over 95, and several dozen over 100, and most nights in the 80s. Had no problems keeping 70-72 in our ‘02 DS 40ft with two 13.5 units. We had 50* air out of the ceiling ducts.
I see these threads fairly regularly. What I find disconcerting is the number of folks describing how difficult it is to get the temp below 80 “even when we start the a/c units early in the day”. Or, “it takes three hours to cool the coach down after we park and set up.”
Folks, please! If you’re dealing with that kind of heat with the intention of trying to control it, why in blazes are you shutting the things OFF??? Turn ‘em on and leave ‘em be. On the Highway, overnight, doesn’t matter! If the temp is 90 plus, why are you not running them while traveling? Save a few $$$ of diesel? Seriously?
Run them!
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Old 11-25-2021, 06:04 AM   #31
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We have a 40' 2001 Newmar Dutch Star with two A/C units. If we keep the windshield covered when the sun is in that direction it does stay cool in high temperatures. Our windows are double glass, which I think makes a huge difference.
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Old 11-25-2021, 03:44 PM   #32
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No, it can be a straggle, last summer I was in Las Vegas it was over 90 my two AC’s could not keep up so we left to a cooler place

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Old 11-25-2021, 04:03 PM   #33
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Agree with the “Maybe”. If where you camp is similar to camping in the middle of an open field, the three may not be enough in 90+ degree heat. However if you choose heavily wooded campgrounds the two should work adequately as long as you run them continuously. For piece of mind, to be better prepared for high temps, get a third unit.
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Old 11-25-2021, 04:07 PM   #34
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2 is enough for me

I have a 40 ft DP Damon Ultrasport with 2 13.5k Coleman A/Cs and I live in TX. I ran both units 24/7 this summer and I had no problems with the temp. The temp wasn't any higher than 78 all summer. 78 feels great if its 106 outside.
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Old 11-25-2021, 04:08 PM   #35
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Quote:
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Will 2 a/c units on 40' coach keep it cool enough in 90+ heat? John
Depends upon the sun load as much as anything. If you are well shaded and you don't want it below 75 in the coach you'll be ok.

If you are in the sun you'll be luck to get it down to 85. Even three A/C will struggle with full sun on the broad side of the coach.
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Old 11-25-2021, 04:10 PM   #36
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Will 2 a/c units on 40' coach keep it cool enough in 90+ heat? John
Yes, that what I have and use.
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Old 11-25-2021, 05:15 PM   #37
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On our Winnebago Voyage 38J, 2 ACs could not keep the coach below 80 when it was 98 degrees out side. I Filled all the 4" x 4" holes under 6 different places where water and electric lines come up through the floor, filled all with spray foam. Now our 2 15K ACs can keep the coach 70 inside when it is 98 outside. That is also with exterior sun shades on the windshield and cab side windows and the sun straight above the coach.
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Old 11-25-2021, 06:18 PM   #38
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Two other factors need to be included when people discuss how well their A/C works. Often, people with older coaches, some with just one slide say two A/C's are fine. A one slide coach easily be 25% - 35% smaller in overall size than a newer coach. With our full wall slide, kitchen slide and bedroom slide, we're close to 400 square feet of living area in a 40' coach.

The second factor.....you have to determine what one persons' idea of cool is, versus another. Some are okay with mid 70's, for me, cool is 70 degrees.
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Old 11-25-2021, 07:01 PM   #39
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I like having the third unit if for no other reason than as a “spare” if one fails. Then you still have two units.
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Old 11-25-2021, 07:06 PM   #40
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We have a 40' Holiday Rambler with 2 a\cs. Live in it in Palm springs . When its 120 outside I'm keeping 76 inside.
So yes, a quality coach can keep you cool.
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Old 11-25-2021, 07:51 PM   #41
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No. Do not buy a 2 a/c 40 foot rig.
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Old 11-25-2021, 08:20 PM   #42
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We have a 40' Holiday Rambler with 2 a\cs. Live in it in Palm springs . When its 120 outside I'm keeping 76 inside.
So yes, a quality coach can keep you cool.
Wow! That's really good!

Any shade trees?
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