Gee. I just replaced the cooling unit. We layed it face down on the floor (Had to move a fixture but only 4 screws and that was also part of the next job) took the back off and carried it out the door. carried the new back in and put it on (Ok I'm very highly simplifying Rachal did a lot of work "Between" Steps) and shoved it back in place.. Works great now. No windows involved.
Next job was replacing the floor on the slide out.> The Fixture (Dining room table) I needed to move bolts to that floor so it had to move anyway .