13,500 BTU a/c

A lot of variables in that question. How large of a trailer? Ducted or not? Open floor plan or closed off bedroom area?

The 13.5k unit on my 22BHM is not ducted and does just fine in our little trailer, even in very hot weather. I wouldn't want to have that setup in a much larger unit, but it works just fine in ours.
 
If there is a vent over the bed then it's a ducted system and the A/C is suppose to cool the bedroom. We have a 32.5' long trailer with one 13.5K A/C located in the living area with one vent in the bedroom. We spend 30 days during the summer in it with some 90 degree days and it had no problem cooling the bedroom. If things really get hot at night you can close some of the other ducts located elsewhere to deliver more cool air through the vent in the bedroom.
 
We have the 15k btu in a 26bh, and some nights we get cold, even in the 95+ temps.
However, the 26bh is one big room--the only inside door is the one for the bathroom.
 

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