Have any of you used evaporative coolers? My apartment doesn't have central air...and I have a 5,000 BTU a/c unit in my living room, but the way the apartment is set up, air doesn't flow well to the bedroom. I was thinking about picking up one of these for the bedroom. I like the idea of being able to keep the only window in the bedroom free for opening when it isn't hot enough for the a/c. How well have these worked for you? I guess my main concern would be humidity, even though it doesn't get as hot in PA as it does in some places, the sticky air can make temps in the 60s feel rotten.