how's it going RIU with spring time around the corner I just wanna make sure my new room will continue to be cooled and smell proof First off I built a room out of plywood and insulated it with pink insulation batts. The room I built is inside of a non insulated concrete barn/garage. Inside the room I built I set up my grow tent because I could not obtain negative pressure in the room alone and needed to contain the smell so my tent worked perfect in regards to negative pressure working with my carbon scrubbers Now for the details The room I built is 10 feet long by 7 feet wide and 8 feet tall everything is insulated the floors wall and ceiling the tent I have inside that room is 5x5x7 The temperatures This is where it gets weird as I kind of have to go along with mother nature Inside the room I built the temps stays at 55f on by the floor and about 62f by the ceiling which is perfect as the tent stays at 80f at the top of the canopy and 73-75f by the floor. For my exhaust I have two 200cfm inline fans at the top of the tent each on opposite sides and each with a 200cfm phresh carbon filterand they exhaust into the room I built and also a medium sized fan just to push air around For the vents I have two holes open about half way up the tent on one wall (shown in picture) that pull in a good amount of air to cool the tent The lights I have are 4 Mars hydro 300s on 24/7 as I run autos Now my concerns are with spring right around the corner the temps will be rising right now it's around 20'sf but in summer it'll be 80-90f. This where my main questions are OK so right now everything works fine which means having the room.i built at 55f, this is a problem because there is no way I can keep it that cool during the summer I have a 5000 BTU AC unit I plan on putting in the room I built ( I have a piece cut out of the wall for the AC unit to mount into) but I know the AC alone won't cut it I can probably get it to 65 at the lowest. So I believe I have 2 options Option 1- instead of exhausting into the room I built I could exhaust into the barn that way the heat from the lights wont be heating up the room I built. My only concern with this way is that it still might not be enough to cool the tent and won't know until it's done Option 2- just say screw it and take the tent out if the room I built and purchase an 800cfm fan and a carbon filter to go with it and cut a hole in the room I built and exhaust that into the barn. With this option I don't know if that will be enough cfms to create negative pressure for the room and if it is if it will just suck all the cold air from the AC out and not cool it effectively Sorry for such a long post I just wanted to try and detail it as much as possible I also apologize for the absence of pictures as I am at work and will get some uploaded in a couple of hours I am open to any answers and gladly appreciate your input!!