You could also try wetting a wash cloth and wiping them down with it. Not soaking them or anything, but just dampening their fur. I did this to Eddie once and he was fine with it. Well, he didn’t like it per se, but he got cooled down. lol
If you have empty water bottles you could refill them and freeze them and just lay them in their area for them to find and get cool from. Maybe even on the tile to keep the tile cool.
I just gave mine baths to clean their bums and even though I have the air on plus fans running (I hate being hot and am paranoid about them), they seemed like they were cooler and feeling good. lol
Also if you aren’t doing and if you can, put the fans or position them closer to the buns so the air blows on them. Mine initially didn’t like the air blowing on them, but now they love it. They’ll hop up to my air purifier and sit there, letting the air blow on them. LOL