Ok so basically I have decided to upgrade by grow this time to an 8x4 tent from a 4x4 tent. I've read online that you need roughly 4000-5000 BTU per 1000w light. Anyways, I have a 14,000 BTU Whynter portable A/C and I thought that would be enough, long story short, it wasn't (Temperature reached 81+ degrees) and I had to go to Home Depot to get a second 8000 BTU portable A/C. I just hooked it up tonight and while the temperature is in an acceptable range of roughly 75 degrees with a few hot spots I need to fix, it still seems that it's hotter than it should be. Maybe I'm wrong, but I feel that with roughly 22,000 BTU's of cooling power, the tent should be in the 60s since I'm only using two 1000 watt lights. I am going to optimize the second 8000 BTU AC tomorrow by putting it on a table so the ducting to the top of the tent will be shorter, but still it seems like to me at least that the temperature should be much lower. I am wondering, if anyone has any suggestions on what I might be doing wrong? Here's what I have in the tent: - Two 6" cool tube's (Just basic run of the mill cool tubes. I haven't put the add on wings on though I doubt that matters.) - A Nanolux 1000 watt digital ballast and some shitty ballast I got from a local hydro store. They are inside the room, though it seems unlikely that that would cause the temperature to rise more than 1-2 degrees, if even that. - One IPower 6inch inline fan (442 CFM) - 4 clip on fans - 1 Lasko 16" oscillating fan - 1 Whynter 14,000 BTU Portable A/C - 1 LG 8,000 BTU Portable A/C I'll take some pictures of my setup tomorrow, (I'm not currently at the house.) though I've done grows before and know how to set them up. I'm thinking either there's an air leak somewhere that I haven't found or that my 14,000 BTU A/C is finally giving in. I have had it for over a year now, so I guess it's possible that it's starting to go. Any suggestions?