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Old 03-18-2015, 11:08 AM   #1
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Air conditioner normal?

I have one AC unit on the back roof of my 33 RETS-6. It is cooling but does not cool the inside down much. In 100% sun We are lucky if to see 80 inside when it 80 outside. It's dehumidifying / dripping some water. Is this the norm considering all the solar heating taking place. Curious what what others are experiencing. The air feels cooler but not cold. It must run thru alot of duct work in the ceiling.


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Old 03-18-2015, 11:17 AM   #2
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Maybe normal, maybe not. You have a lot of camper to cool for a single unit, especially in full sunlight as you describe. You don't mention what air conditioner you have, but it's likely a Dometic model on a FR product. You can do a quick internet search for your model if you don't have the manuals and get the troubleshooting guide where there will be some performance checks (like temperature measurements) to see what's happening.
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Old 03-18-2015, 11:27 AM   #3
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It is usually also normal to only get 10 degrees lower inside. In the hot sun.

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Old 03-18-2015, 11:38 AM   #4
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It your AC a 13.5K or 15K unit?
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Old 03-18-2015, 11:52 AM   #5
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We add a 13.5k AC to our 15k AC to keep things cooler.When we had 90+ temps we were lucky to get things under 80 with the 15k.
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Old 03-18-2015, 12:01 PM   #6
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Check the temp of the in-going air and the out going air.

Should be about 15 differences. If you are in direct sun you are sitting in a big box catching all the sun. My 30FT works fairly good until the outside temps reach 95 - Takes about an hour too cool down once air is started.
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Old 03-18-2015, 12:09 PM   #7
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I did what Herk did to his AC and completely covered the cooling unit on the roof with the alum bubble insulation, insulated the piping with pipe insulation and taped the alum bubble insulation to the inside of the roof cover and have spent many days in full sunlight and 95+ heat and it cools our 8528RKWS just fine. TOWTA likes it @ 72 or cooler and it has no problem accomplishing it. We have a 13.5T unit.
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Old 03-18-2015, 12:14 PM   #8
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OC, you have a white roof which helps. My Diamond tan colour sucks up the heat. The newer gelcoat are a champagne colour which assists with cooling.
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Old 03-18-2015, 01:38 PM   #9
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Quote:
Originally Posted by OldCoot View Post
I did what Herk did to his AC and completely covered the cooling unit on the roof with the alum bubble insulation, insulated the piping with pipe insulation and taped the alum bubble insulation to the inside of the roof cover and have spent many days in full sunlight and 95+ heat and it cools our 8528RKWS just fine. TOWTA likes it @ 72 or cooler and it has no problem accomplishing it. We have a 13.5T unit.
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OC, you have a white roof which helps. My Diamond tan colour sucks up the heat. The newer gelcoat are a champagne colour which assists with cooling.
Agreed! I also think the newer units are better insulated as well

We have a white roof as well (along with the gelcoat). Granted we have 2 A/C, but do not have any problems keeping the unit at 70-ish degrees during a 100 Alabama Summer day.
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Old 03-18-2015, 01:58 PM   #10
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I am trying to convince the DW to install a second AC prior to going south, we were a little warm last year in Goshen.
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Old 03-19-2015, 11:18 AM   #11
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Make sure its not short cycling, good separation between incoming and outgoing air. Should b a divider with no air going in between.
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Old 03-19-2015, 11:26 AM   #12
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OC, you have a white roof which helps. My Diamond tan colour sucks up the heat. The newer gelcoat are a champagne colour which assists with cooling.
It still struggled until I made the Herk mod and afterwards we've never had a problem. I can tell you, it makes One H--- of a difference.
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Old 03-19-2015, 11:52 AM   #13
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It still struggled until I made the Herk mod and afterwards we've never had a problem. I can tell you, it makes One H--- of a difference.
I see the mod never mind.
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