Air conditioning problem

TyroneandGladys wrote:
Bottom line on ANY AC RV or home if you are getting a 20 degree difference between the room temperature not outside temperature but inside temperature and the temperature coming out of the AC then the AC is functioning correctly.

Mine functions better than that, but it still won't get a 100-degree trailer much below 80 or so.

Bottom line on ANY AC RV or home if you are getting a 20 degree difference between the room temperature not outside temperature but inside temperature and the temperature coming out of the AC then the AC is functioning correctly. You need to cut down on the heat gain and the size it is cooling for better cooling.

Some tips:
Window tint on ALL windows.
No showers
Use the microwave not the stove.
Cut down the traffic in and out of the RV.
Close off the overhead bunk area and the cab area along with any other areas not occupied such as bathroom.
If you have a awning park with the awning facing west and put it out.
If you have window awnings use them if not some shade cloth with Velcro tabs and matching tabs on the rv around the windows will do wonders. We have a total of 6 1"X 1" tabs for a 40" inch long window three on top and three on the bottom.
Do not let it get hot before you turn on the AC. If traveling run your generator starting in the morning with the AC on so that when you stop you are not trying to cool a HOT RV down.
Ours might be four foot shorter than yours but we have stayed cool in temps over 110.
Would also advise something on the lines of this.
We have experienced low voltage numerous times in campgrounds/RV Parks during hot weather.

Double check the installation- dont assume it was properly installed at the factory. You may find your are returning chilled air back into the A/C unit thus reducing the differential you are seeing.

what is the "dog house"? Is it located from the roof or inside intake?

Never heard of it before.

Thanks.

dt

Due Therms Delta T range is 18-25 degrees. If you're getting below that there is a problem. The best you can expect with 80 degrees at your return air is + or - 55 degrees at your supply.

If your like me and live in a coach with a 30 amp system, I can only run one 13500 unit at a time. My roof and AC's are white. Our AC unit will keep us cool in 100 degrees here in Florida, but it runs non stop and requires regular maintenance.

With our unit the first thing I did once we got it home was, remove the black A/C covers, scrub and rough them up,and use plastic specific paint and spray them white. Then I used Reflectix bubble insulation and insulated the dog house area where the cooling coils were located. While I have no documented proof of any increase in efficiency, we have friends with the exact same coach, only 1 year newer then ours, and they can't keep their coach as cool as mine while they're using 2 A/C's and I'm running 1 A/C.

Thanks for the prompt input. I keep thinking something is fishy because my old 5th wheel had a lot more space inside and never was a problem with a single roof top unit.

rancherwillie wrote:
We have a 2012 Winnebago aspect,,model 30j. The Coleman 13.5 roof air

We're in a Jayco 31, which I'm guessing is probably close to the same size. Ours is a Coleman Mach 8 15K roof air - and we have almost the same problem. But we're a bit better.

I can get about a 15-20* difference. So that still makes it a scorcher when it's hot outside.


If you go to the Coleman Mach website (Airxcel?), you can download a PDF that describes how to test your unit to see if it's performing or needs service.

A couple of thoughts: 13.5K sure sounds small. 12* doesn't sound enough. But, I'm thinking you could do a bit better but it'll never be great. Just a thought.

For desert conditions single 13.5 and even single 15 won't cut it. Be sure the coils are clean. We can provide instructions. Isolate the cockpit with heavy blankets or sheet Reflectix and put foam insulation in the ceiling vents.
If a lot of your coach is black I can see that being a problem. Just not a dark a/c shroud. The a/c pulls air from rear to front. Once through the condenser core it spills out the sides. Be sure air that's been through the condenser can't get back around the ends or the condenser to heat it. If this part isn't clear I can link you to a thread about it.

Our Aspect has always been about like that. I think it needs more insulation, plus a lot of heat comes from the front seat area where the AC doesn't cool.