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Old 06-19-2016, 05:24 PM   #1
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Window a/c vs rv a/c.

We have a 2015 40 foot trailer with 2 long slides and the 15k roof air has a tough time keeping up. I have read that rv a/c only cools the air 20 degrees from the incoming temperature. My question is would a 10k homeowner window mount cool more than the 15k roof mount. We are set up in a park where the owner hits us pretty hard for electric so efficiency is certainly a consideration. We have windows to the floor the whole backside of the camper so window units would not be an issue. Next largest problem is this park has only 30amp breakers. Yup that is a problem. Would two 5k window units take less power and do a better job than what we have? How about one 5k unit with what we have with nothing else running? Pros and Cons all the way around. Yes everything is clean and working well on current unit. Just asking is at home we have a 10k in the window that I think could almost freeze our camper but I could be wrong. Opinions?
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Old 06-20-2016, 08:11 PM   #2
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The 10k in addition to the current 15k will probably keep the temp where you want it, but the 10k alone will have the same issues that the current unit has.

The problem is the insulation values of the walls and ceiling in the RV is much lower then in any home. That's why it appears to do such a good job at home.

Depending on the electric rate, it may be worth it to upgrade the floor insulation and change the windows to more energy efficient models.
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Old 06-20-2016, 08:34 PM   #3
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15K BTU is not enough for a 40 footer. You need 24K to 30K as a minimum. Even more in areas with 100 degree plus weather.

Your 15K unit probably needs 15-16 amps, and the 5K units about 5 amps each. A 30 amp circuit is rated for 30 amps MAXIMUM, but only 24 amps long term (continuous). You could probably Just squeek by with the pair of of 5Ks and the 15K if you are using NOTHING ELSE that draws 120 Volts. That includes the converter, so you would need to shut it down when all 3 units are operating and operate your 12 volt loads on battery.
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Old 06-21-2016, 04:56 PM   #4
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I think I can get by with one 5k but not sure it is really possible with two. Tough to have everything else shut off. One 5k would make a difference with the 15k that is there. I wonder if two 5ks without the 15k would be better than roof mount.
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Old 06-21-2016, 05:52 PM   #5
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Window a/c vs rv a/c.

I have a 8k window unit in my wildwood xlite 185rb which is a 19 ft TT and on high cool it only gets it down to about 75 degrees in 100 degree temps
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Old 06-27-2016, 07:31 AM   #6
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Ran a 5k along with normal air this weekend with no problem but with it being over 90 out and no trees the camper was still over 80. Wondering if I can run an 8-10k air unit with the 15k roof mount on a 30 amp breaker. I know it is borderline. Can't run the main air with a coffee pot or microwave without triggering the breaker. My math says it will work but sometime in real life things don't work I quite the way I added them up. What do you guys think.
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Old 06-27-2016, 05:21 PM   #7
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If you get an energy efficient unit it might work, but then again it might not. Really only one way to know.
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Old 06-27-2016, 10:52 PM   #8
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I really don't think 30amps is enough, you would have to turn everything else off and if both air conditioners would start up at the same time it would trip the breakers, have you got another 110 volt plug that you could plug into that's not on that 30amp line. They make a cheater box so you can get 50amps


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Old 07-01-2016, 02:59 PM   #9
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Originally Posted by spock123 View Post
I really don't think 30amps is enough, you would have to turn everything else off and if both air conditioners would start up at the same time it would trip the breakers, have you got another 110 volt plug that you could plug into that's not on that 30amp line. They make a cheater box so you can get 50amps


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Our park is an older park and only has 30 amps.
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Old 07-01-2016, 03:05 PM   #10
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Any one try a portable AC

LG Electronics LP1013-RB 10,000 BTU Portable Air Conditioner 115V, Factory-Reconditioned - Walmart.com
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