Ideally you want a temp range of 72-78 degrees F when lights are on, I would get a co2 tank and some good inline fans to ventilate the area if you decide to go with a 400 or 600w. otherwise start off with a 150w or 250w. When you grow in those high temps you will get airy buds, heat stress, aka some bad weed. If you can't do much about the temp at all go with some type of skunk strain or any strain the grows well in those types of conditions.