AC you need to set up exhausts from a cold source. Like a window or whatever
And if you on a budget. Then, you won't like the cost of them.
And, I've yet to find a good cheap AC until that doesn't cost a boat load to run. If you using it for a tent. It'll have to be running all the time. As the temp in a tent, changes within mins.
A good negative seal is usually more than enuf. If your grow room exceeds 28c then period using a tent is not an optimal thing for you pal.
As I said. A good AC until will use in excess of 700w an hr.
And a good 3-5000btu until you'd need will cost at least 400e and that's a cheap one.