During the cooler months I heat the room with a oil filled heater (plugged into a ranco t-stat) and keep it at 76/77 degrees. I provide a hot spot of 88 degrees.
During breeding season the room temps is 76 degrees and the hot spot is lowered to 82/84 degrees. (November to February)
During the summer things are a bit different rather then cooling down the room I let the room get as high as it gets, usually 84/86 degrees and do not offer a hot spot.
My oil filled heater is 1500 watts and the Ranco T-stat has a maximum load of 1500 watts http://www.reptilebasics.com/ranco-etc-111000-pre-wired (I use the one wired for room heater), I have used this system for 7 years now without any issue.