1rstTimer
California
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Joined: 07/10/2012
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Hello everyone! I am the proud owner of a 2013 Skyline Bobcat 173B. I have a question to everyone in regards to the ac unit that I have. I have the roof mounted Dometic 13.5 btu ac. The TT is currently sitting in my driveway hooked up to my house. The outside temp is 82 and the coldest that I have been able to get my TT is 75. From everything that I have read is that I should be able to hang meat! Could there be a problem with the ac? Is my expectations way to high? Oh and it is not under shade. Thanks for the help in advance!
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2oldman
Winchester WA
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Joined: 04/15/2001
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It should get colder, but not more than 20* colder than ambient. If you're running off an extension cord, make sure your voltage is ok in the coach and that your ext cord plugs aren't getting hot. Low voltage is not a/c friendly.
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Bucky Badger
Madison, WI
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Joined: 11/05/2007
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I have a 39footer and have had my 13.5 down to 77 but it was 98 degrees, and the camper was in full sun. I think you may have an issue.
You should have NO PROBLEM cooling a 20 ft camper. Check voltage
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tvman44
Southwest Louisiana
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Sounds like a A/C problem. Best thing to do is measure the air temp going into the unit and the air temp coming out the unit. If you get about a 16 F difference then the unit is doing all it can and you need more. 
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Altern
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2oldman wrote:It should get colder, but not more than 20* colder than ambient.  Please explain why it can be 110 outside and a home will easily cool to 70 in the hot desert southwest.
I think you are confusing the drop between an evap & condenser coil and thinking thats as far as it will go.
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Mandalay Parr
Phoenix, AZ
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RV's are not known for being well insulated like houses.
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kzspree320
Louisiana
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You should be able to do much better than that. You need to measure the temperature drop between the air input (return air) and air output (vent). My 13.5 Coleman AC (2007 model) gives me a temperature drop of about 25 degrees. I would expect at least 20 degrees in a brand new unit. Use an infrared thermometer to measure the temps. They are relatively cheap. Here is a link for one at Auto Zone for $30.
http://www.autozone.com/autozone/accessories/OEM-Non-Contact-infrared-thermometer-Temperature-range-31-to-689-degrees-Fahrenheit/_/N-26lq?itemIdentifier=951642_0_0_
I also use this to measure the tire and wheel temps when it is summer and close to 100. If one tire or wheel is unusually hot you may have problems coming (under inflation, bearings, etc). The 2 tires in the sun will usually be hotter. I have also found uses around the house. I hope this helps. Good luck.
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1rstTimer
California
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Thanks everyone for the suggestions as I have also noticed that the compressor keeps cycling on and off and I see no runoff(water dripping) from the ac...
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lostmarbles
Sacramento, CA., USA
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Joined: 05/23/2004
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2oldman wrote:It should get colder, but not more than 20* colder than ambient. If you're running off an extension cord, make sure your voltage is ok in the coach and that your ext cord plugs aren't getting hot. Low voltage is not a/c friendly.
I believe the object is to get about 15 to 20 deg difference between air intake and air output on home dwellings. Where's Chris B. He can give you an better idea on RV differences.
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garym114
Bluff Dale, Texas
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Joined: 07/24/2006
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Are you plugged into a 15 amp receptacle?
How long is the extension cord and what gauge is the wire?
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