I agree, I roast over 26C! Not pleasant at all. I run my rimless 8g without heat, as the evaporation is less. Here is a photo of it when it was a Dutch scape last year.You can minimise the evaporation, if you run the tank at room temperature then evaporation will be next to nill it's when the tank is 5degree's c hotter or more you have problems, I'd have a hotter room but this is the uk after all and I just isn't warm, ever.
That and keeping my bedroom at 26C is just far too warm for me