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Old 07-09-2006, 05:27 PM   #1
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1996 34' Excella
Americus , Georgia
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A/C Cooling performance in a 34ft trlr.

Hi,
I just got back from my vacation trip in Destin, Fl and had a great time and enjoyed staying at Topsail Hill state park. During my stay the outside temps were 100 deg and up according to my thermometer and my Duotherm Penguin a/c ran with the compressor on from 10:00 am to 9:00 pm with the fan on Hi and the interior temps would rise to 85 deg during the hottest part of the day and would remain above 80 deg for several hours. I had all the awnings out to provide some help and all window shades closed.The parks voltage stayed above 110 . The cooled air was 60 deg when the int was 85 deg.As the day would end and the outside temps cooled then the interior temps dropped and the a/c compressor would cycle. A SOB was parked next to me and was about the same length with 2 slide outs and his a/c heat pump would cycle all thru out the day. I have pondered adding another a/c or upgrading my current a/c to a 15k btu model. Any suggestions would be appreciated . Thanks Davis.
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Old 07-09-2006, 05:37 PM   #2
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We live in Texas. unless we have 2 Ac's, our camping season is over near the end of May. I don't know what they were thinking at AS when they started building 34' trailers with only 1 AC. A 15,000BTU would be better. 2 13,000 would be perfect.
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Old 07-09-2006, 06:13 PM   #3
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AC in 34 fters

We recently ordered a 34 fter and had thought that we would hold off on the 2nd AC. I had posted a thread in the "Classics" forums asking for advice from other owners of 34 fters. It was strongly recommended that we add the 2nd AC. This was particularly true for owners in hot temp climates like Texas. You wouldn't think that we would need a lot of AC in Michigan but if the temp is in the 90s, the single 13.5 AC on our 31' Safari struggles to keep the inside temp under 80. The new ones come with a 15K in the front and a 13.5K unit in the rear.
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Old 07-09-2006, 06:50 PM   #4
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While camping on the 4th of July weekend, we ran our 13.5K Coleman with 2 Honda EU2000I's. 4 adults sleeping at night, compressor would run 6 minutes on, 6 minutes off. 90-93 outdoor temp in the shade, got down to 76-78 inside temps during the day and down to 72 at night. My unit seems to cycle a lot, I may try and outboard a T-stat and see if that makes a difference.
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Old 07-09-2006, 08:02 PM   #5
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Davis, was the site you camped on a shaded one? I'm not sure about the 91's but the roof on my 84' is now highly reflective white .... check out my post "Airstream One wears a white hat."
I'd be thinking at least an upgrade to 15k but the real world might be better served by installing one more 13k unit.
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Old 07-09-2006, 08:30 PM   #6
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Same Problem here

In reading this post, this brings up a question. Since I already have OEM A/C mounted in the center of the TT, where would I mount the second unit?

I guess I could use the rear ceiling vent, but that's only about 10 ft away from the other unit.

Mitch
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Old 07-09-2006, 08:53 PM   #7
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Mitch, you've hit on the problem exactly! I have the same issue with mine. I'll undoubtedly upgrade to the 15k btu unit in the near future... but until then, finding a shady site and using the awnings is a must.

Good luck!

Roger
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Old 07-09-2006, 09:09 PM   #8
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We have the 15K BTU DuoTherm in our 28' and it has to be left on the High Fan setting to provide any decent cooling (high 90s outside mid to low 80s inside). As discussed in other threads the Auto fan setting can't handle high external temps and humidity.
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Old 07-09-2006, 11:38 PM   #9
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Quote:
Originally Posted by Davis
Hi,
I just got back from my vacation trip in Destin, Fl and had a great time and enjoyed staying at Topsail Hill state park. During my stay the outside temps were 100 deg and up according to my thermometer and my Duotherm Penguin a/c ran with the compressor on from 10:00 am to 9:00 pm with the fan on Hi and the interior temps would rise to 85 deg during the hottest part of the day and would remain above 80 deg for several hours. I had all the awnings out to provide some help and all window shades closed.The parks voltage stayed above 110 . The cooled air was 60 deg when the int was 85 deg.As the day would end and the outside temps cooled then the interior temps dropped and the a/c compressor would cycle. A SOB was parked next to me and was about the same length with 2 slide outs and his a/c heat pump would cycle all thru out the day. I have pondered adding another a/c or upgrading my current a/c to a 15k btu model. Any suggestions would be appreciated . Thanks Davis.
Davis,

Unless you plan on re-wiring your trailer for 50 amp service, the current 30 amps of the trailer will not handle 2 A/C units. Your best bet is a 15K unit that will be a direct replacement. Also, try running a floor fan in the trailer during the day. It will help circulate the air better and improve the cooling.
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Old 07-10-2006, 02:03 AM   #10
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Fans

I've got an Endless Breeze fan and a plain old 110 volt 10 inch fan. My trailer is only 25 ft, but I run one or the other these and find they help my air conditioner and the heat pump function a lot. I've only got a 25 footer but letting those small fans run really keeps the WHOLE trailer at an even temp.

One thing that few people seem to know is that you can actually collapse if you go from a very cold air conditioned room to a much higher temperature. In fact you place extreme stress on your heart if the temperature differential is more than 20 degrees. I'm sure that the 15,000 BTU unit is needed for something as huge as a 34 footer, but the putting a fan on the dinette table, or hanging one in the hallway to the bedroom may do as much good as going to two air conditioners.

Paula
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Old 07-10-2006, 06:30 AM   #11
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Metering the temperature is the way to go for checking whether the air conditioner is working properly. 60 degrees is not unexpected for a outside temperature above 100. Unit is working OK. Notice your unit is a 91. Have you painted the roof white yet. This helped me by ten degrees. Internal fan on the floor is a good idea. You could also spray water on the outside of the trailer, if the water does not contain alot of minerals which would cause water spots. Parking in the shade will also help.
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Old 07-10-2006, 08:29 AM   #12
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Davis,
I have two A/Cs in my ’92 Limited. The original owner custom ordered the trailer and told me, “I got tired of pulling into RV Parks late in the day and find that the big motor homes with their 50 amp service were sucking so much power that my A/C wouldn’t turn on.” His solution was to order the trailer with a smaller A/C in the bedroom and have it wired on a separate circuit with its own power cord so at least he could sleep cool even if the big unit wouldn’t start. Up here in Idaho I seldom need the second A/C (although it was nice to have it last month in Nebraska) but I use the heat in both units when we do some late or early season camping. I recommend the separate cord concept which allows me to plug into a twenty amp outlet in addition to the main thirty amp service. Oh, yes, We also use fans on the floor to keep the air moving well.

Gene
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Old 07-10-2006, 08:53 AM   #13
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One of the big misconceptions about Air Conditioners is that they cool the air inside the vehicle. In reality they remove the heat from the air and transfer it out doors. If the temps inside will not lower it's because the trailer is absorbing heat faster than the AC can remove it. While this may sound like a play on words it makes it a little easier to understand,{at least for me}.
pieman
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Old 07-10-2006, 11:57 AM   #14
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Quote:
Originally Posted by Mike Lewis
One of the big misconceptions about Air Conditioners is that they cool the air inside the vehicle. In reality they remove the heat from the air and transfer it out doors. If the temps inside will not lower it's because the trailer is absorbing heat faster than the AC can remove it. While this may sound like a play on words it makes it a little easier to understand,{at least for me}.
pieman
Very true, Mike!!

The laws of thermodynamics (forgot which one) state that you can transfer heat but can not transfer cold. A/C units and refers both work by removing the heat from inside the unit by heat transfer. Your logic is totally sound!
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