Jump Start Hot House w/ Heat Mat, tray, 72 cell pack, 7" domeProduct Details Get a jump start on the growing season with the Hot House with Seedling Heat Mat. It is well known that seeds will often germinate much more easily when provided with temperatures 10F 20F above room temperature. Get started quickly with your own growing media and plugs or purchase them separately for a complete system setup. The Seedling Heat Mat is UL listed and provides gentle heat that will never damage roots. Includes base tray, 72