cops can look into your place with infrared detectors and see if and where you have a grow room. so this is what you do. put a layer of mylar to bounce back heat then alumin. foil to make the heat disperse evenly. then you just keep on going. i think you can add foam to it too. just keep the heat insulated in the room. remember they cant look in your house with out a search warrent. just keep safe.