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 > Are my A/C's working correctly?

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wildtoad

Blythewood, SC

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Posted: 09/04/19 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

As others stated, outside temp is irrelevant. After making sure that the coils are clean, filters are clean, check the temp of the air going into the AC at the return against the air coming out of the AC at the nearest point. And yes depending on your setup, make sure that there is proper separation between output versus return. Many times the install was shoddy and cool air goes back up the return.


Tom Wilds
Blythewood, SC
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rk911

Wheaton IL

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Posted: 09/04/19 04:44pm Link  |  Quote  |  Print  |  Notify Moderator

the only way you're going to be comfortable in 100-deg temps is to...

- use one of two types of windshield sun screen...externally mounted permitting you to see thru the windshield or internally mounted creating perpetual night inside. either will reduce interior heat well. we've had both and prefer the externally mounted types.

- use a couple of small fans to circulate the cold air. cold air sinks. you'll be more comfortable by moving the air around.

- when possible park facing east or north. that will reduce direct sunlight on the windshield which acts like a radiator.

- on *especially* hot days bring in the slides. that will reduce the sq. feet that need to be cooled. the same applies to *especially* cold days or nights when heating the coach.


Rich
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doxiemom11

Yoakum Texas

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Posted: 09/04/19 07:55pm Link  |  Quote  |  Print  |  Notify Moderator

We spend a summer in N Mex sitting in the sun at about 5,000 elevation. Usual daytime temp was 95 - 108. The windshield is the biggest culprit for letting heat into the rv, even with curtains drawn. Get the reflectix for the windshield. It is sold in large rolls especially for motorhomes. That will make about a 10 degree difference. Keep shades drawn, have a fan moving the air around and you will be cooler. We also have insulation pillows in our vents to keep the heat of the sun from coming thru them. Skylight doesn't seem to be a problem with it's two layers. We are 36' with 2 13,500 btu and only ran the 2nd A/C late afternoon when the sun was shining on 1 side of the motorhome and onto the windshield. We were comfortable.

lenr

Indianapolis, IN

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Posted: 09/04/19 08:58pm Link  |  Quote  |  Print  |  Notify Moderator

OP needs to find an RV AC specialist, which is generally not an RV dealer.

justALnow

Ft Myers, Fl

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Posted: 09/05/19 02:04pm Link  |  Quote  |  Print  |  Notify Moderator

If you don't have slide toppers . . . get them.





dougrainer

Carrolton, Texas

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Posted: 09/05/19 03:02pm Link  |  Quote  |  Print  |  Notify Moderator

lenr wrote:

OP needs to find an RV AC specialist, which is generally not an RV dealer.


Where would an RV AC specialist work if not at an RV Dealer or RV service Center???????????? Doug

wa8yxm

Wherever I happen to park

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Posted: 09/05/19 03:16pm Link  |  Quote  |  Print  |  Notify Moderator

Quote:

I have heard they should be able to keep the coach 20 degrees cooler than the outside temperature.


Close but I can understand the confusion

The outlet temp should be about 20 degrees cooler than the inlet as measured at the evap.. But keeping the RV cooler. in full sun. that's a whole nutter kettle of fish.

30,000 BTU's is simple not enough (two 15000 btu roof top units.. If you stick a thermometer in the cold air outlet and measure it should be about 20 degrees colder than the hot air intake on the A/C. Alas 30,000 BTUs of A/C can't keep up with 50,000 BTUs of SUN.


Home is where I park it.
Kenwood TS-2000 housed in a 2005 Damon Intruder 377


Big Katuna

Deland, FL

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Posted: 09/05/19 04:06pm Link  |  Quote  |  Print  |  Notify Moderator

My 15k and 13.5K units keep my 38 Fleetwood mid 70s in 100 degree temp.

Yes, the window shades are down and I use a sunscreen on the font with curtains pulled. Filters and evap coils clean. Thermostat set on 71.

The 20 degree is a differential. 90 in 70 out but as the room starts to cool from the 70 air, the room temp drops. Now it’s 85 in 65 out. Now it’s 80 in 60 out.
Ad infintum until the compressor starts cycling. In 100 degree weather that’s around sundown.


My Kharma ran over my Dogma.

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