I am here to inform all that are having temperature problems to please get an air conditioner, if you are having issues keeping your grow room cool then don't try to cut corners, go big or go home. Give up if your plants are trying to survive in 90 degree plus temperatures. No your plant will not be ok in those temps, we a nearing summer which means its getting hotter outside which means inside is going to def be too hot without A/C especially under HID'S and the only possible way to get around the heat in your indoor grow, is to Guess what? that's right! get a freaking air conditioner! I could only do without one in winter, but not now, i have a 12,000 BTU Portable air conditioner and i keep my room around 75-77 degrees, and that is optimal. Your plants cannot grow at 90 very well and slow down. Don't even waste your time growing inside in the summer time if you dont have any air conditioning. Id rather put them outside and hope for the best, rather than make them die of heat stress, oh ya, stress! if you do keep them in extreme temps soaring that high you are asking for one stressed out plant that can very potentially go HERMIE! I decided to post this, as i am seeing a bunch of peeps asking the same questions. Guess what? its getting hot outside and you need to have an air conditioner to cool your indoor grow room. Common sense, its great. Here is what i use, i can stick this as close as i want to the plants because its on wheels and it has a long exhaust tube to go out my window. As mentioned before i keep things around 75- 77 degrees, and thats with a 1000w 12 inches above my canopy! Pretty cool huh?