Air conditioner size

tshirtman wrote:
Will a 13.5 AC be enough for a 29ft trailer?

Yes.

As as side note the other day I ran the generator for an hour to excise it. I was toggling between the 15K and 13.8K 1992 roof AC's. Per the Kill-A-Watt the 15k pulled .1 volt more than the 13.5K when running. If we ever replaced the 13.5 it would be with the 15K if I had to buy with my money.

We have a 31' Trail-Bay with a 15K which works fine with 100+ degree heat and we also use a small fan in the back bedroom. BUT, with a 30amp system we must limit other power (i.e. A/C off for small microwave heat ups).

As you have read, a 13500 has a really hard time in our Texas heat if there is not a really swell tree overhead. We had a 25 foot and if we left the insulated foil bubble stuff on our large windows, we could do OK, but who wants to be left in the dark?? on a 30 foot in upper 90's and above- don't know that a 13500 could cool it down.

My 13.5 does a good job for my 28' entry level travel trailer in the sun on 101 degree days in South Texas. The secrets; No slides, Refletrix over the south facing windows, covers over the floor vents. Actually, they might be called floor drains as that is where the cold air likes to go. On the worst days, I have been known to use a lawn sprinkler to shower the roof once in a while. I have never had a day that the AC did not cycle occasionally with the thermostat set on 76 degrees.

Dick_B wrote:
What makes the answer even more complicated is that one can have too LARGE an a/c because if it cools too fast it doesn't dry the air and you end up with cool clammy air! I vote for 13.5.
We also find an oscillating fan helpful to move the cool air around.

Given the poor insulation of all trailers, the 13.5 is inadequate in all but the smallest trailer. It's possible in theory to get the space so cold that the AC short cycles, but you are never going to see that in a trailer. More is always better and in Nevada, you are going to need every BTU of cooling that you can get, and no, it doesn't matter if it's "dry heat", it's still heat and has to be removed from the trailer for you to be comfortable.With the 15KBTU AC being about a $150 option, that's a no brainer, you'll be comfortable and it will help the resale value of the trailer.

I recently replaced the 13.5 in my Jayco 266 with a 15. The 13.5 was usually adequate, but couldn't keep up on the really hot days. Since I was replacing it anyway, I chose more cooling power.

Our 25' sits out in the sun no shade at all and on 100+ days it does have a hard time cooling it down my brothers is much bigger with the 15 next to us but its under a shelter with a deck and it is ice cold in his, hoping to get a shelter built for our next summer.

My 13.5 will not keep the interior (26') below 80 in 105 heat. But I suspect poor installation leaks a lot of the cool air into the ceiling along with poor insulation. It cools fine once the sun goes down. Runs continuous in the heat, 15k would not be overkill in the hot dry desert.

Plenty of other posts where a 13.5 does just fine with 30' RV.

thanks much!!
considering a new 2013 unit and it has 13.5 AC