I live in sunny Townsville where the ambient at the moment has been a steady 33 deg. I live in an old Queenslander with no insulation.
I have my room set at 23 deg. It was touch and go through the veg state, but now I am in to flowering, I have my 12 hour day time from 6 pm to 6 am. I also have a couple of additions to the tent. I have some 2 x 6" duct taped to the top of the tent facing the AC outlet, these go through the openings and hang down just above the top of the plants providing nice cool air. The small fan I have circulates it.
The trick is to create the vacuum. If you main inlet is the tent vent flaps and you have your large extractor exhausting, it creates a sort of a vacuum and will suck the cool air through those flaps. You should be able to tell by the sides of the ten sucking in.
You have to monitor your room temp too, just because the AC is on does not mean the room is cool.
I'm with you guys, problem is I don't have A/C so I'm just trying to use airflow to keep everything cool. I have a single fan loosely mounted on top of my converted wardrobe with about 20 small holes drilled in the bottom side as the inlet. Not enough.. :/
I'm a Dockers boy, Rom. We're sitting at high 20's at the moment with the odd mid-30's day here and there.. I probably should try to work on preparing for a big winter grow, enough to get me through but I don't really have the space. I'm also not sure if it's worth plugging in my portable AC just for the cabinet. I reckon I'd need a pretty hefty harvest to pay for the power used by lights, fans and AC..
Herbies Head Shop just resent an order to me that didn't arrive the first time, free of charge. Only chose airmail (with stealth) so there was no obligation for them to resend it for free but they did. And it arrived.