I have a 16' Casita
and since I only use it in Texas I knew I would need some serious cooling. I replaced the original Emerson quiet cool(it barely cooled) with a 10KBTU remote controlled Whirlpool and I can keep the temp in the back of the trailer a frosty 58(thermometer verified) when running full blast in the summer heat. I might add that I completely insulated my Casita
with the foil "bubble pack" insulation that is sold at home depot or Lowes and bought new foam backed carpet from the Casita
factory and reinstalled that in the trailer. I also cut the foil insulation to fit the windows
in the trailer and dark tinted the windows
. I highly recommend doing this as it greatly reduces the amount of heat radiating through the windows
. Granted, I can't see out, but I figure that the only time I'm in it I'm sleeping, otherwise I'm outside anyways. Plus I like it cold and dark, its like being in a fiberglass cave.......