thank for the advice. i have did a change in my room instead of using 6 600w i have replace the 2 middle 600w with 2 1000w so now i'am running 4 600w & 2 1000w and my temperature has a big change from 6 600w at 78 with only 1 8in inline can fan & two oscillating fan, with the 4 600w 2 1000w with 8in inline can fan & two oscillating fan and a haier 5,700 btu window ac now i'am at 91 WTF thinking about getting another A/c unit like 10,000 btu or higher should i go window ac or portable ac even maybe just putting back the 2 600w