They are self contained recirculating. They are right next to my flower room which is AC cool. I should of got a bigger AC unit. LOL. I didn't think it was all going to get this big but it get's out of hand. I was thinking of just filling the empty containers in the flower room with water and ciculate that for a cool floor. That or the fridge, and I just saw one cheap that had a few dents at slowes. Yes the widow roots good. I got 5 afgani and only one looks like it might make it now. I'm moving alot of stuff and it throws you off trying to get back right. Thanks.