i have a 150 hps, its not very hot at all. i keep it at about 6in. from the center tops and lst when i need too. i started with 4 under it considering that i wanted 40w+ per sq ft. 2 were male, i new i would get at least 1 male. its doing very well with the 2 that are left, they are really starting to fill out at 30 days of flowering. our area gets real warm in the afternoon because thats when the sun hits the house they seem ok with only a fan on them, and i would bet that it get 85-90 up there on the hotter days. try covering your windows while the sun hits them to keep the heat down.