I bought a Power Plant, SUPERHPS600w, have to say there's very little heat build up from it. I have one fan in the room and the hottest the room gets is 28 degrees and that's with the lights running 24/0. I know how you feel about the more, I just set up this grow, I'm already planning on adding another 600w HPS for my next grow and I'm getting a 250HPS and a tent from a guy who's leaving the country soon enough. So for my next grow I'll have 1700watts between HPS and CFL. (250cfl, 1450HPS)