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Old 09-14-2014, 05:17 PM   #1
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Need more air!

Our MH rooftop a/c is not the greatest. It works fine if temps stay below about 85. In Oklahoma summers the temps often climb to 100 or more and we spend a lot of time at racing events where there is usually no shade. Of course on those days the a/c simply is not enough. The condenser has been cleaned, fins look good and the air intake side cleaned also. It moves a little more air than before the cleaning but still not enough. Any suggestions on how to get more air. Should we replace this unit with a newer model or possibly add a second unit? This one is a Coleman that is what the MH came with in 1989. What have you guys done for more air?
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Old 09-14-2014, 05:54 PM   #2
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We added a second unit but for different reasons, the air conditioner is so loud it's hard to carry on a conversation now we can run the rear ac while watching tv or when we have company. I wired the rear unit to a separate electrical box and cord so it can be plugged into a twenty amp circuit because our coach is thirty amp. Now we can run both units when temps are extreme burrrrrrrr it was a great upgrade.
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Old 09-14-2014, 06:11 PM   #3
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Thanks for the input Elf111, I care more about the cool air than the noise. I'd much rather not talking & be cold. How much work is involved in adding a second unit? Cutting a hole in the roof sounds pretty scary. I wired my cargo trailer for 30 amp service so that part I can handle And to the Moderators, I didn't intend to post the same topic twice. I didn't think the first one went through. Having internet issues. Sorry 'bout that!
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Old 09-14-2014, 07:05 PM   #4
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I upgraded one of my two 13,500 BTU Carrier Air V's to an Advent Air (Just the upper unit) without increasing power consumption (The newer Advent is more efficient).. HOWEVER.....

Even with the upgrade in full sun (And where I am there is no shade) temps INSIDE climb somewhat seriously.. I use fans at the computer station and one in the bedroom (always in the bedroom) to help keep cool.

But to the greatest extend possible, Choose your parking to minimize sun on glass (I am in Southern GA parked facing SOUTH and the motor's blown so I can not even move) use awnings and sun screens, As much shade as you can get (none where I am) and finally.. Think like a Mexican

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Old 09-14-2014, 08:02 PM   #5
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If you add a second A/C, are you going to be able to get enough power to run both?

Another thought, if your coach is equipped with an awning, having it extended on the side most exposed to the sun can be a big help as well.
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Old 09-14-2014, 08:09 PM   #6
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If you have a roof vent in the back it will fit in that hole however you will need to determine if the roof in that area is strong enough to support the extra weight. The hole will need to be reinforced between the ceiling and the roof if it's just insulation or foam you will need to add strips of wood in between, believe it or not the ac unit just clamps onto the roof thru the vent hole. The hardest part was finding a safe way to get a one hundred pound box onto the roof thankfully my son had a forklift to use.
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Old 09-14-2014, 08:25 PM   #7
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If your existing A/C is of 89 vintage it will likely be getting tired. The air coming out should be in the 40's. If not a new A/C may be in order.
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Old 09-14-2014, 10:35 PM   #8
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We try to block as much sun as possible. all side windows have blinds and the wife made lined curtains as well. We use reflective shades on the windshield and close the pleated curtains across the front. The awning is usually extended but we can't always have the coach parked with the afternoon sun on that side. It stays pretty cool until about 3 or 4 in the afternoon. At night it gets really cold, we have to turn it down. There is a vent in the bathroom area but it's too far back and not centered. The back is always cooler. If I was to add another unit I'd like to have it toward the front, ahead of the existing unit to cool the front of the coach/drivers area. What is required to cut the opening in the roof? I know the size needs to be 14 x 14 and braced around the edges but I don't know how the roof is constructed. This thing has no leaks and I'd really like to keep it that way. Anybody seen this done or know about roof construction on these? As for power I'm thinking about running a separate line/breaker box just for the a/c on a 20 amp circuit and plug into shore power/genny only on the really hot days. That's the way I wired my trailer. Thoughts?
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Old 09-15-2014, 07:24 AM   #9
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First, if there's no hole, there's no internal bracing in the roof. Installing an AC under those conditions probably not a good plan. Eventually the roof will sag under the weight of the AC and water will pool around it. I'm sure it's not too hard to figure out you're inviting major issues at that point.

Because of that, and the fact you're not likely using a 5-6 kw genny required to run a pair of large AC's, I'd suggest you check into a larger new (more efficient) AC to replace the one you have. Pretty sure that once you get it up on the roof you could install it yourself.
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Old 09-15-2014, 07:34 AM   #10
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The first thing to do is determine if the present A/C is working properly. It should be able to kep the trailer 15 degrees cooler than the outside air. That is all. So if it is 100 outside, the the air should keep the inside at 85. Any higher inside temperature than that you need to have the A/C checked out by a competent cooling and heating expert.

If the unit is working O.K. then look into the suggestions here, regarding shade, etc. If it is not , replace.
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Old 09-15-2014, 07:36 AM   #11
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You might be be able to use a portable air conditioner they would use some floor space but you wouldn't have to take it if you don't think it will be too hot. They vent out a window, I've never used one but have read on this forum that you should get one that draws intake air from outdoors.
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Old 09-15-2014, 09:09 AM   #12
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This is just one example of a dual hose portable. The two 4 inch flexible hoses need to go out a window or roof vent.

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