I felt so bad for Ruckus when our AC went out last year. The fan is a must, which you're already doing. A big part of keeping them cool is keeping their bellies cool, but stubborn little things like to sprawl out froggy style when they're not so the panting just continues. I have a cooling may that you can find at pet stores, but I found a few cheap at TJ Maxx. It's one that you fill with cold water and the mat stays icy on their bellies and they can lay there to cool off. Ruckus spent a lot of time on the tile in the bathroom, it was cooler than the the regular floor. I hope the weather stays a little cooler for Chubby!