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Old 07-19-2019, 09:32 PM   #1
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Air conditioning

My 2013 came without air. Vent and wiring are in place. Escape offers an 11,000 btu unit. Can I have a Coleman Mach III 15,000 btu unit installed in the same space?
Craig
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Old 07-20-2019, 06:40 AM   #2
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I thing that would be way too large for an Escape. If you do not size it properly then the a/c will come on chill you down fast and then shut off and then repeat again and again. You want a smaller sized unit that will operate for awhile while it conditions your air. A properly sized unit will not cycle as often than an improperly sized unit, thus saving start up wear and tear and electricity.
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Old 07-20-2019, 06:58 AM   #3
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Many 28, 30, 32 ft 5th wheel trailers come with a 15,000 btu A/C .
15,000 btu seems like over kill for a Casita . The bigger unit will cool the trailer but won’t dehumidify the air properly . I believe the one on our 17 ft Casita is around 9000 btu
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Old 07-20-2019, 07:17 AM   #4
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I installed an 11,000 unit. The smaller unit makes more sense to me. Not only more efficient but a lot less ugly... well, except for the sound.
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Old 07-20-2019, 08:20 AM   #5
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The OP purchased a 2013 19’. His profile is outdated.

I can offer that my 9,000 BTU mini-split perfectly cools a 19’ or 21’. With proper sizing and inverter technology it does not short cycle and provides great dehumidifying. An oversized unit in a humid environment will cause you to feel cold and clammy.
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Old 07-20-2019, 10:31 AM   #6
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While I agree with the comments that the 11,000 BTU/hr size is likely more appropriate than 15,000 BTU/hr, the direct answer to Craig's question is "yes". Common RV air conditioners all install into the same 14" square opening.

In an RV with 30 amp service, running a larger air conditioner would be even more restrictive of what else you can run at the same time.
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Old 07-20-2019, 12:49 PM   #7
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Camped in Moab last week, no shade on the trailer and temperatures 90-100, the factory installed 11,000 unit did the job. It does take some time to cool when the temp inside is close to 110.
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Old 07-20-2019, 12:59 PM   #8
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In preparation for our first summer campground hosting in Big Bend we replaced our second MaxFan with a Coleman 13,500 BTU/Hr unit. A bit too big for an E21 but we expect to use it to cool down before bed and then rely on high desert cooling to stay tolerable. There is no humidity in Big Bend to speak of so that is not an issue.


Time will tell if this plan works,
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Old 07-20-2019, 01:12 PM   #9
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As already mentioned, bigger is not always better with HVAC equipment and ideally, equipment sizing is based on a design load calculation. Difficult to do that with an RV since its geographic location can change (maybe RV manufacturers just assume Florida in the the summer?) so they are probably oversized from the factory already.

Here's a short article with a bit more detail in explaining the issues with short cycling and dehumidification that previous posters pointed out...

https://www.energyvanguard.com/blog/...-Is-a-Bad-Idea
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Old 07-22-2019, 01:09 PM   #10
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Another point in favor of the 11KBTU is power. The trailer has a 30A plug, and the 11KBTU needs about 11.5A out of that 30. Add in 12A for the water heater, 3A for the fridge, and 3A for the converter and you're pretty much right at the limit if everything kicks in at once. A 15,000BTU AC would need more like 15A, so staying under 30 would get much more difficult.
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