Roof top A/c not able to keep up.

The friendliest place on the web for anyone with an RV or an interest in RVing!
If you have answers, please help by responding to the unanswered posts.

Marchos77

Active member
Joined
Dec 5, 2018
Posts
32
Location
Chuluota, FL
My Allegro rooftop A/C unit up towards the front is having a hard time keeping up in this hot weather.  Right now the thermostat is set to 78 but at the moment its 87. The rear A/C works like a champ and it gets cold back there.  Anyone have any suggestions as to what might be the issue?  I wish I could get up top and check it out but the ladder on the back of the RV only holds 220lbs and I am about 100 over that.  It runs and when the day cools down it get cold but only at night.  Seems that during the day unless its shaded it can't get the temp down below 80-85.
 

Marchos77

Active member
Joined
Dec 5, 2018
Posts
32
Location
Chuluota, FL
Probably what I need to do. How much weight can the roof support? Also, has anyone come up with another method of getting on the roof of the bus without using the rear ladder?
 

Utclmjmpr

Well-known member
Joined
Sep 14, 2009
Posts
5,618
Location
Cedar City, UT
Have you ever stopped to think of where most of the glass in the coach is located??  Cover as much as possible,, use window awnings and any other form of shade possible.>>>Dan
 

Marchos77

Active member
Joined
Dec 5, 2018
Posts
32
Location
Chuluota, FL
Utclmjmpr said:
Have you ever stopped to think of where most of the glass in the coach is located??  Cover as much as possible,, use window awnings and any other form of shade possible.>>>Dan
You have a good point. There are several windows in the area in question but we have thrown out the awning and closed all the shades in the room.  Still gets pretty hot.  It has been over 100 degrees here so its stands to reason that it would not get better than 20 degrees from high which today and tomorrow will be 110.
 

cadee2c

Well-known member
Joined
Aug 4, 2012
Posts
1,167
Location
Everywhere
I had the same issue with my front a/c a couple of years ago. Mechanic went through and cleaned out all the vents and stuff but it just wast able to cool the room. I ended up replacing it with a new one. However, even now, it doesnt work well in the direct sun if the outside temp gets up to 90. Do what Dan suggested, cover the glass.... on the outside if possible. That should help tremendously.
 

Gary RV_Wizard

Site Team
Joined
Feb 2, 2005
Posts
76,141
Location
West Palm Beach, FL
The windshield is the huge sun & heat hole in the front of any coach. If you haven't covered that, preferably with a reflector, covering windows isn't going to change much. Also the rooftop skylights, if any. And finally, all the windows up front.

I personally think that cleaning the roof top a/c fins is vastly overrated as a solution to most any RV a/c problem.  The more sensitive area is the air filter and the inside heat exchange, where the interior air blows over the chiller.  You should check the effectiveness of that part of the system by taking air temperature measurements at the room air intake and the first available cold air exit. The difference should be 20-25 degrees if ithe a/c is working as designed.  If less than that, you will need to dig further into the a/c internals, but if it meets that criteria than forget about any further cleaning or repairs cause it is doing all it can ever do.
 
S

sightseers

Guest
in most every RV....if it's 100+ degrees outside.

  80 degrees inside is about all you can hope for.
 

House Husband

Well-known member
Joined
Jan 26, 2019
Posts
325
Location
K.C.MO.
The condenser is an important part of the system. It's responsible for transferring ALL the heat in the system to the outside air. Any contanament on those fins greatly reduce that capacity. You can blow out the fins with a water hose or compressed air. Just make sure the air flows freely through the fins. A little Dawn will help also.
 

johnhicks

Well-known member
Joined
Jun 28, 2013
Posts
265
Location
Florida
  My a/c runs around 10F under summer ambient. That said, the thermometer in the shade indicates 95F and the indoor therm indicates 84F. However,  the entire length and breadth of the MH is exposed to direct Florida sun all day. That's about as good as it gets for a heat-soaked RV.

  It was better in Texas when we had a steel pole barn.

  Don't expect more than reasonable.
 
Top Bottom