I have the 18"x30" or something close to that with, the thermostat control. Its a good thing in the winter if germing or cloning in a lower temp room, but they really arent needed in summer when ambient temps are above 60 or so. Good luck
oldnslow Reviewed by oldnslow on . Propagation heat mat VS classic methods of germinating seeds... Hey, guys! What do you think of that heat mats? Is it worth of spending money on it? Rating: 5