Heya, Here in texas we have to contend with high temps (over 100F and 40C during the summer months....but luckily almost all interior spaces in the entire state are airconditioned and the indoor temp never gets all that high. I only run heaters in my now discus tanks and in my other tanks in the dead of winter when the average temp is 60F (16C), but that is only for about 2 months :)