I live in Georgia and a month ago it was VERY hot here. My tank reached 81-82 degrees so I went out and bought the Hawaiian Breeze from Target for like $9. What I did was took a piece of acrylic and sat it over the rear of the tank, directly above the compartments in the rear, and the fan sits there. It DOES NOT stay on and I only turn it on for a little while if the temp gets into the 80's. But most of the time my temp stays anywhere from 76 - 78 degrees. In fact, in the fall and winter it's hard keeping it warm. I hope this answered your question.
craig