I have a ~4'x4' insulated (paneling outside, R13 between studs, R3 reflective roll insulation as an interior "wall" with duct tape over all seams) grow room, built inside of an uninsulated outdoor storage shed. I run two HLG 100 v2's and a tabletop fan.
I have a BN-Link temp controller watching heat (small ceramic heater in the room) and cool (7k BTU portable AC unit outside of the grow room, with a manifold and ducting routing cool air in the room). I also have duct that goes from inside the room to outside the building.
Not sure if I call this room a "sealed" grow room or not. Even with my duct taping all seams, I know there are still light leaks around the door.
With the temp controller set to 75F, the room still gets up to 80 before the AC's preset compressor lockout turns off and the freon actually starts flowing and cooling the room.
Right now that outside ducting is just sitting there...but should I hook up an exhaust fan to it to pull hot air out and try to maintain temp? Or will I just be causing the AC to kick on more since all that new/cool air will be leaving?
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You should always be exchanging the air in your grow room for fresh air. So yes, you should be using something like an inline fan to pull the old air out of the grow room causing negative air pressure that sucks fresh air in.
Some of the new ones like the AC Infinity can be programmed to only come on when needed to help save electricity cost.