This is what I do when my temps are at around 71F, usually cools it down a couple degrees depending on the fan angle, I refuse to let my water temp get above 76F no matter what, there's almost always a few fans on or a couple open windows too, sunny days will get the ceiling of my room(temp is on a clock) to 80-90F which makes me miserable, but the water temp usually stays in a safe range, the smaller tanks never getting above 71 usually. In the winter I'll still have my windows open and my room will be like 40F. Having a room that has the sun facing it all the time is the worst.