Question about Dometic Rooftop RV Air Conditioner

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I have a 13500 penguin ducted AC on a 2007 24 foot Bigfoot Class C motorhome with thermopane windows. I had it parked and had the ac set at 90F since I was working in and out of motorhome. I had put alum foil bubble wrap on all windows skylites ceiling hatches. I am at location where the outside day temp is about 116f and lowest night temp is 85f. Since I got his motorhome used. I set the thermostate to 65F and took readings at outlet of furthest duct was 65F, reading at the cooldown outlet is 58F. I even put alum bubble wrap between the coach part and the cab, looks ugly but insulated. the inside of motorhome is about 80F after running this arrangement for about four hours. I am wondering if AC is OK or if I should upgrade to 15000. Or am I asking too much.

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Of course, upgrading to the 15000 would cool you more, and more efficiently. You're pushing the limits of the 13.5 k unit, but it's your comfort that matters. If it's sufficient for you, that's probably the bottom line. Not sure what your top temperature outside will be, and that will determine if you need to upgrade or not, but it seems to me that it's holding ok, under the circumstances. Your comfort- and your call!

Posted on Jul 03, 2010

  • William Gehrke Jul 03, 2010

    Is the differentail temp. outside of 116F to the Temp. at cooldown outlet 58F (this is the closet outlet) acceptable for a 13500 unit. I forgotoe mention that the compressorseems sort of loud,



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