S.H.
My 2 cents:
I agree with Maineah. If your rattling a/c blows cold air, I'd definitely try to replace the gasket first to minimize the vibration and noise that scares the poor kitty before opting for a swamp cooler swap out. Sadie has a Recair evaporative cooler (not by my choice). It's bareable enough if sitting directly under it on a hot dry day/evening with the windows open for extra ventilation, but it is not cold. The moist air is heavy and does not travel throughout the house either. If you add that to an already humid environment (say....most of Oklahoma, Texas....heck, the South in general), you'd find yourself in one sticky, potentially moldy situation. Since most of my trips with Sadie so far have been in the Fall and Winter, I've not been in a hurry to remove the swamp cooler. I've used it only a few times since I got it cleaned out a month or so ago. (I sometimes go out to the motorhome to practice my fiddle or read in peace.) I have to sit right underneath it to feel the cooler air. Another draw back: Once the pump fills the reservoir, the water sits in the reservoir, even if it's not all evaporated out; another potentially moldy monster. Oh, and a swamp cooler adds one more water line to winterize. Eventually, I'll be trading Sadie's out for a roof top vented fan that pulls air in through the windows. Unless your travels take you to mainly desert like air conditions (I guess that might be high altitudes too), then a swamp cooler is not the way to go.
Some of the owners on this forum have some really great ideas for building up and insulating between the a/c and the roof.
Keep reading past posts, and don't be afraid to ask lots of questions. We love talking about our toys.
(Yes....I could rattle on even longer.)
Best wishes on your a/c adventure.
shanda