dont let it get any higher then 90 degrees at any time. Try and keep it at around 80 to 85 which is perfect and at 50-55 % humidity. Also I see your gonna use a MH light, this is fine for vegging plants but I would highly recommend an HPS light for flowering, especially if you want the ultimate grow.
yes i am doing really well, 77/f is good it dosnt have to be at that temp all the time (-10 or +10 F) is fine. at the moment its winter here 7 degrees celcius out side and 15 degrees celcius in the room with the light on and mine are fine. I havn't used the extraction fan yet still trying to keep them warm.