PjMiller
Hello, 

 We are on our first trip in the heat, 110* in Needles and our Domentic is not getting our 189R even close to cool. What might be the issue or are we being unrealistic in thinking that it should be a.ble to cool us down.

Pj
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Tiki2some
Wow - 110! We don't get that high in the mid-Atlantic states, but I will say we find the RV A/C is less robust than house A/C. It does cool, but is less than "cold." No idea how much cooling you'd get over 100, I'd hope you can get sleeping temp down to a more comfortable range, though. We open a window(s) on the opposite end of the trailer from the A/C and using the vent & fan to help exhaust warm air as we start cooling — similar to how you'd vent in your car when starting up A/C to help get the initial temp down — I'll leave the Pro Tips to Retro owners out in AZ and hotter climes.
~ Linda & Bill
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kevinkpk
It should keep 25 deg. cooler than outside temp. I had to have mine replaced this summer. If it's under warrenty, take it in.
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Shannon
 Most of what I have read, as well as experienced in South Florida, is that you can expect about a 20° drop from the outside temps, although 25 degrees might be correct, depending on other factors. So either way, if you are starting at 110°, it’s likely to be pretty warm inside. The only other things I can suggest are to try to park in the shade, use awnings/blinds to minimize the heat coming in through the windows, and try to minimize using the range or any incandescent light sources inside. Since your rig is pretty new, I doubt if this is a problem, but you may want to be sure your filter is clean. In the long run, if you do a lot of that type of camping, you may end up needing a supplementary AC, such as a roll around unit, which would increase the interior cooling capacity.  Or, I guess you could add an additional roof unit as well, but I’m guessing that would involve a lot more expense and hassle. Finally, it may be possible to upgrade your your A/C to one with a higher amount of BTUs,  although that’s still obviously expensive to do.
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vicwood
I have used my A/C in 100 degree temps and it was very cold, so cold I had to turn it off.  It doesn't work as well in very humid weather, but Needles is not humid! I have a 195, I'm not sure all units have the same size or type unit, but I would have it checked for sure.
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PjMiller
Thank you everyone for you advise and when we get home it is going in under its warranty  and I have been told that it is a throw away model. I did ask and was told to upgrade would mean rewiring and yes expensive. We are currently at  Rivernook campgrounds in Kernville, CA and have picked out #45 as being one of the best spots, shady all day, on the creek, and spacious. 

We have a 189 and I will ask the dealer if the model makes a difference on the size of the air conditioner.
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Woody
We hardly ever used our ac, basically using it to make sure it was working w/o actually really needing it. (2016 SE177). When we really needed it in Elko Nevada in July it didn’t work! They didn’t try to see what was wrong with it, they just replaced it. Throw away model, we bought an extended warranty or insurance policy so all we paid was $60 freight.  
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Gran
Hi, when I lived in AZ in July, temps reached 117 and my AC couldnt keep up...it was about 80-90 inside...always make sure filter is clean!
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John
A 15000 BTU AC will drop into the same roof hole as a 12500 BTU. Dropping 30 + degrees in a trailer that is not a 4 season trailer is considered good in AZ summer heat. I was always able to get my older trailers really cold inside until I got a new one with the external female 110v plug for power. Doesn't seem to make as positive a contact as a wired in cord. Other factors that are really important for AC is the length and thickness of the cord. Try a shorter cord. Also many parks do not have a full 110-120v pumping into your hookup.  Sometimes it is just a circulation problem is you have wall and you need a little fan.
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sunvalleyjoe
Hey Woody seems that Evap Cooler work better in Nevada less humidly . We have both ac and swamp cooler in Reno . When temp gets over 100 deg swamp gets turned off and ac goes on. Evao cooler use less power and work well . Ps Elko and Ruby Mts do not get as warm as Reno area. GBA!!SBVJ
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