We don't have a window unit, we have the bubble on top but I do know that until we insulated, our steel trailer would get a lot of condensation built up when running the a/c. Also, during the heat of the day, the a/c would have a hard time keeping it cool. But at least it was cool at night for sleeping!     Good luck.

RIDE ON!

We just have a standard dressing room GN that has been insulated with the 1/4'' foam that goes under home siding then covered with wood paneling. When we bought it there was a window a/c unit already installed through the front wall. It ain't fancy but the dang thing works great. Keeps us real cool as long as we have 110v. Much cheaper for a do it yourselfer.

Good Luck, PTA

We spent a week in Arkansas a couple of years ago when the temp was upper 90s day and only dropped to 85 or so overnight.  I bought a 110v window unit for the trip and slapped together a wooden frame to mount the unit in the door between the dr. room and horse compartment. I closed all of the frame except for where the air cond. fit with styrofoam and just clamped the whole thing in the open doorway with a couple of c-clamps after we got there.  I just set a bucket under the unit in the horse compartment to catch condensation.  

It saved us from having to spend some miserable nights and works just fine for occasional use.

Bob

Cowgirl - I can't remember the name of the stuff but it looks like bubble wrap made out of aluminum foil.  Just look at Lowe's or Home Depot, you can't miss it.  We put it up with a silicon glue that comes in a tube like bathroom caulking.  It really works great to insulate against temperature as well as sound.  Just to make it look nice, we then covered the bubble wrap with carpet.  We can now cool or heat the bunk area in a matter of minutes and no condensation dripping on your nose in the middle of the night!

RIDE ON!

Hi. I have an aluminum trailer with a window unit. When I get to a show, I (Unscrew) pop out the window and slide the unit into the space. I made a wooden frame that I painted white to match the trailer. The drain is on the outside. It works well.

We have an aluminum trailer that we first installed a window unit before we insulated.  Here in Florida in the middle of summer it was tolerable but not cold and at night it was good.  Once we added insulation it made a big difference.  It helped to have a fan to move the air around and up into the nose of the trailer.

http://i27.photobucket.com/albums/c160/YippeeKiYo/horse%20trailer/BairCond6.jpg

http://i27.photobucket.com/albums/c160/YippeeKiYo/horse%20trailer/BairCond5.jpg

Use roofing felt as a barrier.