How about a second tent for A/C?
Yeah make sure you get an A/C with 'manual' controls... Just good ol' knobs and switches. And they're usually less expensive than the digitally controlled models. I have one that I used in my last grow location which was a room built inside a room down in an unfinished basement. We just cut an outline of the A/C unit into our 'wall' which was made of 1 x 1's with
panda film covered 4' x 8' insulation sheets but I doubt if you want to cut a large hole in your nice tent. With that setup I just set my manual A/C on max and used a remote thermostat that Green Air Products makes inside the bloom room to control it.
I always failed miserably at trying attic grows in the summer but I have a buddy who does an attic grow and what's worked for him is using a 2nd tent just for the A/C unit. He puts the A/C inside of tent #2 and exhausts the unit outside the tent but uses the 2nd tent as a place he can pull cool air from for his 600w cool tube and he routes his air right back into the A/C tent. Even after the air whooshes through the cool tube it's cooler and less humid than the air in his attic. He also has another intake fan that pulls air into his grow space from tent # 2...
I think this same concept could be accomplished cheaper by making an A/C 'chamber' out of a 1" PVC frame with
Panda Film over it. I made a grow tent out of these materials a few years ago and it was VERY air tight. It was so air tight that if I made another one I'd design it with bracing every 2 feet instead of every 3 feet like I had it. Even with a decent sized passive intake hole the walls would really suck in whenever I ran the Eclipse/Ostberg 630cfm fan on my lights.
One other thing... Little Giant makes a great pump with a float switch that works great for dumping the condensation for you. You route the A/C's condensation hose to any one of the holes you see on the top of the Little Giant (Model VCMA-OULS) and route plastic tubing to wherever you want the water to go and when it fills up enough to trigger the float switch the unit kicks on and runs the cute little pump about 20 seconds and BOOM! Bob's your uncle! We even had the hose running uphill in our basement grow and the pump had plenty of push to deal with the incline. Here's a pic of it... I saw one online for $35 at this website:
http://www.simplyplumbing.com/littlegiant-554425.html?productid=littlegiant-554425&channelid=FROOG
I hope this helps...
Peace!:character0103: