I got a small ac unit from walmart last night and really did not have enough time to put it in the window so I just put it on a stand. Well it's on highest setting and it's not cooling anything down. There is cold air coming out of it but it's just not cooling the room down. It went down to 68. I can get 62 maybe with just putting ice packs by the plants. So what could the problem be? Does it need to be in the window with the back outside? I'm putting it in the window tomorrow. Next idea is to put in under the shelf with the plants because it blows up. Is it even safe to put on the ground in that way? This sucks because I have the perfect highland, if not ultra highland conditions in the winter. But it's summer and not so perfect. Is there anyone else who has an ac running for their plants?