Here is what I run with a 400w sealed hood. I do vent into the attic though. Works well, my room stays within 7 degrees of what my ac is set on, on the hottest days (mid 90's) .
I had my AC go out around 5th week of flower. I took my set up down, put the plants in my bedroom bathroom with 4ft T8 tubes, and made a quick patch in the wall, all in all it was a 5hr job, but since my hole ran into my AC closet and out of a old vent for the gas heat. Which I didn't want him to see a 6in hole running to a closet, in the room next to where he was working. Lol It all went well, but it was very stressful for me. Lol But cost is around $100 bucks for this set up. I am going to upgrade the fan to something in the 400cfm, I think I can get it down to my room being around 3-5 degrees warmer than the AC setting. Good Luck, be smart, think it out, solve the problem and be happy! : )
http://www.amazon.com/iPower-GLFILT6M-Control-Australia-Charcoal/dp/B008NYF8S4
http://www.amazon.com/LEDwholesalers-GYO2402-6-Inch-Hydroponic-Booster/dp/B003YFADW8/ref=pd_sim_lg_3