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Old 07-11-2016, 01:23 PM   #1
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A/C Cooling Issues

I recently purchased a Columbus 377MB with two ac units. The unit is not staying cool during the heat of the day. The dealer had to replace the rear unit but this has not fixed the problem. The in and out air temp at the ac does remain about 20 degrees difference. My questions are, is anyone else having this problem? Any tips to help keeping he RV cool? His is the third fifth wheel we have owned, so I know it should be cooler. Thank you in advance for any advise.
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Old 07-11-2016, 02:24 PM   #2
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If the A/C maintains a delta-T of 20F and there's no air leakage between the intake and return, then it's doing all it can do, and the RV is gaining more heat than the A/C's are able to offset.

Is there any shade where you're parked?
Are you in a hot, humid environment?
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Old 07-11-2016, 02:30 PM   #3
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Is your roof black or Brown?

If so, they may look awesome but they don't cool worth a darn.
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Old 07-11-2016, 02:32 PM   #4
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No shade. RV is on blocks on a permenant site in Virginia. It has not been too hot this summer so far. Will roof vents help or placing additional installation? On a 85 degree day the interior temp wil usually get to about 80 in living room and 85 in bedroom.
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Old 07-11-2016, 02:36 PM   #5
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Roof is close to white.
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Old 07-11-2016, 02:36 PM   #6
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Read this thread for some tips.

Pimp My Coleman Mach 3 AC
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Old 07-11-2016, 02:58 PM   #7
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I looked at the thread. Very helpful. Is there a post somewhere detailing how to insulat the unit? I want to try this week.
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Old 07-11-2016, 03:31 PM   #8
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Quote:
Originally Posted by Jkp1799 View Post
I looked at the thread. Very helpful. Is there a post somewhere detailing how to insulat the unit? I want to try this week.
Read the entire thread from the beginning. If you have any questions just PM me. I think you should have no problems.

Use metal foil tape on all air handler seams and use spray adhesive on both the air handler metal and the Mylar insulated sheet. Let both dry well before sticking them together. Remember it WILL NOT BE MOVABLE once they touch each other. Cut around the product sticker and the door to the electronics and just tape those insulation pieces in place so you can access the information and the capacitors easily.
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Old 07-11-2016, 03:59 PM   #9
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Insulating it ac

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Originally Posted by Jkp1799 View Post
I looked at the thread. Very helpful. Is there a post somewhere detailing how to insulat the unit? I want to try this week.
Did you insulate your ac unit? And did it help get your rv cooler? My 39 ft rv has only 1 ac unit and it can't keep it cool. It is running correctly . We had it checked out.
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Old 07-22-2016, 09:19 AM   #10
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Make sure that you close the "night shades" on the windows facing the sun. Keep going in and out of the camper to a minimum. Dont use theoven if possible on hot days. Two A/Cs should do the job on 85 degree days.
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