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Old 04-29-2009, 08:50 AM   #1
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Re: It's Getting HOT!! RV Air Conditioners??

have you thought about mounting a window shaker A/C unit under the bus and ducting the cold air up into the bus, some of the high end r/v's used a heat pump setup under the floor.
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Old 04-29-2009, 09:05 AM   #2
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Re: It's Getting HOT!! RV Air Conditioners??

Cutting the hole should be doable with your favorite cutting tool (I would probably use a jigsaw myself). I would probably reinforce the hole itself, either with wood or steel. The rooftop units clamp around your roof, and without reinforcement, you'd end up crushing the two layers together. I believe several of the conversions listed here document that process, including gone camping's bus.

Most stick-and-staple RVs of that size have 2 or 3 rooftop A/C units of at least 12,000 BTU. My supposedly 30' (really 27.5') motorhome has 2 13,500 units which I'm trying to get rid of.

In my conversion, I plan to install at least 1, perhaps 2 12,000 BTU mini split air conditioner systems. This unit here is what I want: http://www.ac-world.com/proddetail.p...12000BTU&cat=9

The disadvantages I see to rooftop units is that the controls steal head clearance, and the intake and return for the unit are really close together unless you find a ducted unit. In really hot days, 2 units running full tilt in the 30' motorhome would keep the temperature in the mid 70s when it was over 90 outside. They seemed to really struggle to keep up. When I was living in a 27' travel trailer for a summer, the single rooftop A/C kept it down in the mid 70s in the shade. It wasn't a pleasant summer. The electric bill was unreal.

In any case, you need to decide what is best for you. I hope this helps.

Good luck!
jim
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Old 04-29-2009, 10:16 AM   #3
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Re: It's Getting HOT!! RV Air Conditioners??

I put a 13.5K in my 35' Gillig last summer. A Skillsaw w/ a metal cutting blade makes nice, straight cuts. A jig saw, or grinder w/ cutoff wheels would work. 2x lumber fit between the skins perfectly to re-inforce the roof. I would make a thin spacer inside- flat on one side, curved to match the inside roof on the other. The inside A/C panel is made to mount to a flat surface, and will distort when you tighten it down to the curve. Mine works O.K., but the rotary switches bind a bit. At Burningman, Nevada dry lake bed latest August, upper 90's to 100 out with no shade, one 13.5K would take the edge off if I pulled the curtains mid-way to help isolate the front area.

For a 40 footer, you'll want 2 roof airs, unless you can always count on parking in the shade. Probably take a 6.5K genny to reliably run both. In theory, a 3500W genny will run 2 13.5's , but I doubt it would start both.
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Old 04-29-2009, 10:21 AM   #4
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Re: It's Getting HOT!! RV Air Conditioners??

Quote:
Originally Posted by elkoskoolie
For a 40 footer, you'll want 2 roof airs, unless you can always count on parking in the shade. Probably take a 6.5K genny to reliably run both. In theory, a 3500W genny will run 2 13.5's , but I doubt it would start both.
A 5500W genny will run 2 13,500 A/C units and a microwave without struggling.

or, you could probably get away with 2 eu2000i generators, 1 per A/C.

hth,
jim
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Old 04-30-2009, 09:39 PM   #5
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Re: It's Getting HOT!! RV Air Conditioners??

The RV roof top airs are also very, very noisy.

Try http://www.ronthebusnut.com (look under "Conversion Products" >"Heating & Cooling" > "Air Conditioning"

Ron carries a lot of "scratch & dents" and some that aren't. Check out the Central Air units.
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Old 05-01-2009, 11:01 PM   #6
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Re: It's Getting HOT!! RV Air Conditioners??

I used the 4 1/2" angle grinder....









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Old 05-04-2009, 10:53 PM   #7
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Re: It's Getting HOT!! RV Air Conditioners??

I cut the hole so that the aft side of the hole was right beside a ceiling cross member, as the heaviest part of the A/C was to the rear of the unit, so most of the weight is centered over that cross member. Leave yourself at least a half inch so you got just a little room for error. Don't crank down on the bolts, you can tightened them nice & firm but don't torque them as the roof can bend a little and you'll get run-off leakage/seepage.

Ceiling control panel will stick down about 2" or so. I'm only 5' 7" so even with a 6' ceiling I could deal with that. But I also installed a drop ceiling that took away 2" in the center also. I tried the control panel at first when I installed it in the rear of the bus...






I didn't care for the way I had to run the ceiling material around it, and decided I wanted the unit up front. you can see above the ceiling control was about the same depth as my drop ceiling. So I removed the a/c from the rear and installed a standard RV roof vent in that hole, made a new hole up front and tried it again, this time I created my own intake and outflow vents (square is the intake, narrow one is the outflow).



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Old 05-30-2009, 10:16 AM   #8
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Re: It's Getting HOT!! RV Air Conditioners??

Is there such a thing as an LP GAS AC unit? google does not produce much may be one of you has come across something like that?
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Old 06-01-2009, 10:40 AM   #9
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Re: It's Getting HOT!! RV Air Conditioners??

http://bryantrv.com/docs2/docs/acservice.pdf

That appears to be a duo therm ac service manual. It says 14.25"x14.25" for the opening. It includes other information such as how you should insulate the opening and other such things.

hope this helps,
jim
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Old 06-01-2009, 12:30 PM   #10
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Re: It's Getting HOT!! RV Air Conditioners??

cut one layer, then use a small square to make sure you stay square with your hole and put a mark at each corner. Then, drill a small pilot hole at each corner where that mark is, and you'll find it easily on the other side.

Good luck,
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