well I'am lucky,For I'am a carpenter and building things is alot easy for me.I cut a hole in the ceiling of the closet and installed a ac duct.Got a box of insulated flex duct and ran it back to the central air handler and cut hole in the air bonnet installed the ring and hooked up the flex duct.When the heat is on I close the vent in the closet.I cool the whole house to around 70 to 75 degrees and the closet runs around 72 to 81 but mostly around 75.I have a darkroom vent I builed in the door with a 3"x3" muffle fan pushing air in the closet and the light is air cool shade with a 200 cfm fan pulling air through the light and exhaust into the attic.8" fan in the closet moveing air around all the time.The closet is 8'long by 8'high by 2' wide.So far I dont have any heat problems with one 400 watt hps light and 5 plants. If you cant cut a hole in your door I would replace it with a door I can cut a vent in.I'am guessing you are in a rented appartment or house.That way you can put the door up some place till when you move put the old door back up.Hope this helps you if you need to know something about carpentry pm me.I'll try to help.Peace