If you have an attic and your a/c ducts are up there cut a wye into one of your a/c ducts and run a 4" or better yet 6" flex duct down to grow room. A swamp cooler will introduce a ton of humidity into your room sure to give you some mold issues. The wye and flex duct couldnt be more than 40 bucks tops and should help alot. :rasta: