I never really had a problem with heat. The hottest my tank has ever got was 82.5 and that was when it was +35 outside with MH on. After that I ran a room fan pointing at the sump with the stand doors open and it never went past 82 again.
It is in a small room though, so if needed I can add a small air conditioner to bring the temp down. Maybe I could even run that off my ACJr
