You can get a chiller for the tank, or you can use fans to an extent, but idk if the drafts are good for them. I never did, I just kept my temperate species at room temperature and they did fine when summer rolled around. Water at room temperature is always cooler than actual room temperature usually by a good 10 F degrees.....don't use air temps as a comparison. Most basements are just fine for keeping amphibians ....the concrete walls are a natural insulator, my basement is always at least 10-15 F cooler that the rest of the house any time of year. You can even get it a few degrees cooler than that by placing the tank directly on the concrete/tile floor. The floor just has a tendency to suck the heat right out of the tank.