If you did a small one with carbon filter it should be awful or maybe I'm just used to use it
That is my fear more then the winter is ac in the summer it's get's well over 100f up there in the summer now and with a grow it would be way worse
Don't think one in your basement would cost as much as you think. Doesn't need to be structural. Whats the ceiling? Finished drywall? Open joists? Drop?