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Old 06-20-2010, 01:03 PM   #1
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Default Pit trailer A/C unit

I'm getting a 6x12 trailer this week and I'm going to build a wall in the back and have a window unit to save some $$ over buying a roof mounted unit. I'm curious how many BTU's I will need with the walls insulated with the foam board as well as the ceiling. I'm afraid to buy one without input because I don't want to waste money on one that doesn't cut it. I live in NC where it has been about 95 degrees for the last several weeks.

I can get a 5000 BTU for $100
A 6500 BTU for $150
and a 8000 BTU for $199
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Old 06-20-2010, 01:09 PM   #2
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Well, I have a 6X12 that only the roof is insulated but I have thick wall boards so I'm not sure how much I lose from not having the sides insulated. Anyways, I'm using a 15,000btu roof mount and with a HD strip door at the rear and Mine stays about 72 all day long. It shuts down often in the morning but by mid afternoon, it's running pretty much non-stop in 85-90 degree heat.
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Old 06-20-2010, 01:11 PM   #3
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go with the 8000, cause you can always turn it down when you dont need it full blast. compared to if you get the small one and its already on full blast and you cant turn it up anymore your just outta luck
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Old 06-20-2010, 01:24 PM   #4
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i spoke with my dad, he is vp of a ac company down here in az. he said a 6x12 will require a 8000 btu to be comfortable and not make the unit work so hard. He said if he were doing it he would be doing a 9000 btu, for little overkill but you wont have to worry about not being able to get to get it cool enough
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Old 06-20-2010, 01:28 PM   #5
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Thanks guys, I appreciate the input. Keep it coming if anyone has anymore experience.
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Old 06-20-2010, 02:44 PM   #6
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I have a 9000 BTU in mine and it does pretty good in georgia heat
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Old 06-20-2010, 06:15 PM   #7
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I found a 10,000 btu on walmarts website for 229 and 97cents to ship. I think that is my safest bet. Now I need to find out if my generator will run all that.
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Old 06-20-2010, 06:58 PM   #8
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The more you can afford the better . I had a 8 x 18 with a 15,000 btu roof unit here in Ga. & it ran pretty hard to keep it cool . Of course it was a lot bigger trailer . 10,000 btu should be good .
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Old 06-20-2010, 07:11 PM   #9
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i have a rooftop 13,500 btu in an 8.5x16 does a good job
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Old 06-20-2010, 09:59 PM   #10
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Consider an EasyStart unit for a Home A/C unit. It will cut
down the locked rotor load on your generator. You should
be able to find one that will work at your local R/V service
center.
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Old 06-21-2010, 04:54 AM   #11
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Jsk, could you please elaborate? I'm not sure exactly what you mean.
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Old 06-21-2010, 01:10 PM   #12
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Quote:
Originally Posted by drewmugx5t View Post
Jsk, could you please elaborate? I'm not sure exactly what you mean.
Hey Drew,

Something like this http://www.modmyrv.com/2009/05/27/rv...tart-capacitor

Basically, it works like the cap in a stereo system, etc in that it helps offset the start load (high draw) when the compressor starts. Depending on your generator the start load will be the biggest draw and if you're close power wise with running load it will help greatly. And most AC manufacturers seem to like to underestimate their start power requirements.

On that note, if you're using something like a 5000, odds are good you'll have no issues either way.
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