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GPStick

St. Louis

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Posted: 05/17/12 06:58pm Link  |  Print  |  Notify Moderator

What should be the expected differential between the outside temps and the inside temps with the AC running? Probably too generic a question but here is our situation. We are in a Evergreen Everlite with a 15000 BTU AC in AZ. The outside temps are around 100 degrees with no shade. The best we can do during the daytime is 85 degrees. There are supposedly 2 set points on the thermostat where the compressor will shut off but the fan will keep running. When set at 75 the compressor will still shut off or cycle and then come back on while the fan continues to run. The air temp at the vent is 70 or less, if I put a probe up into the duct (if that is what I can call it, a channel in the styrofoam only. There is no cold air dump in the unit to put cold air straight down into the rig. The cfs of the airflow is, I think, very minimal. When asked about this before the dealer said the color of the rig would affect the inside temps. When we get back I'm going to have everything looked at again. any experiences with conditions like this with Evergreen's or with any other travel trailers.

Thanks
Joe


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fla-gypsy

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Posted: 05/17/12 07:03pm Link  |  Print  |  Notify Moderator

The difference between the return air and the ducted cool air should be about 20*. The outside temp does not figure in except as heat gain. 100 degrees with no shade is an impossible situation in a poorly insulated TT.


This member is not responsible for opinions that are inaccurate due to faulty information provided by the original poster. Use them at your own discretion.

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2oldman

Wilbur WA

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Posted: 05/17/12 07:03pm Link  |  Print  |  Notify Moderator

The usual expected maximum temperature delta is about 20 degrees.

tvman44

Southwest Louisiana

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Posted: 05/18/12 05:01am Link  |  Print  |  Notify Moderator

I have always been told by A/C people that a temperature delta of about 16 degrees is about all you can expect from any A/C unit. The temperature delta is the difference between the air input to the unit compared to the temperature out at the closest vent as mentioned earlier. Outside temperature does not figure in the equation. This applies to all A/C units, RV, home central, window.


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Gau 8

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Posted: 05/17/12 07:43pm Link  |  Print  |  Notify Moderator

20 is max. Reality is more like 12-15.

wildtoad

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Posted: 05/17/12 07:10pm Link  |  Print  |  Notify Moderator

I personally think that if you can get it to 85 in direct sunlight and it's 100 outside you're doing as well as can be expected. I've heard that you should measure the temp of the air going onto the unit at the return and compare it to the temp of the air coming out and the difference should be about 20 degrees.

I could tell you to find some shade but not likely where you are.


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Chris Bryant

DeLand, Florida, USA

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Posted: 05/18/12 06:03am Link  |  Print  |  Notify Moderator

I think you have an airflow problem- leaking ducts plus air recirculating. The compressor should not be cycling like that. Run the thing for a while, remove the filter and stick your hand carefully up in to the air return- I bet you will feel a lot of cold air leaking from the supply. I would also check coils, filters, etc.

That unit will probably be marginal at best, but it does sound like it has installation issues.


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fla-gypsy

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Posted: 05/18/12 05:55am Link  |  Print  |  Notify Moderator

dan-nickie wrote:

Put up some Reflectix in the windows and be cool.
That stuff is fantastic.
Find it at Home Depot, and I'm sure other places.
You will be delighted with the results.


I will add this also, that plugging the overhead vents/skylights with the reflectix covered foam plugs will slow down some serious heat gain in the sun. There is no substitute for shade either

GPStick

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Posted: 05/18/12 08:31am Link  |  Print  |  Notify Moderator

Thanks for all the thoughts. We did the windows but ran out before the vents/skilights. I'll get some more. Or the stuff from the RV supply for them.

Joe

dan-nickie

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Posted: 05/18/12 05:14am Link  |  Print  |  Notify Moderator

Put up some Reflectix in the windows and be cool.
That stuff is fantastic.
Find it at Home Depot, and I'm sure other places.
You will be delighted with the results.


Dan and Nickie


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