I don't understand why the OEM builders don't put 15KBTU units on all of their trailers. In spite of the published insulation R values, the Polar and Artic packages, blah, blah, blah, these things are poorly insulated and probably lose as much heat/cold as they retain. Given that it is only a $150 upgrade to the customer, it's a no brainer to install the larger unit since there's always the possiblilty that trailer is going to be used in one of the Southern Regions.
My first trailer was a Jayco 22 footer with the 13.5 AC and even at that size, it struggled. That any builder would put that size unit in a 31' TT is surprising to say the least. I suppose they figure most people won't be camping in scorching heat, but that's not always the real world.
If your trailer is prewired and reinforced for a second unit and you plan to keep it for a while, a second unt would be a worthwhile consideration. Your cooling situation is not going to improve on it's own.
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