Proper soil temperature conditions for seed germination are a must for any grower. Normal greenhouse or room air temperatures are usually not high enough to compensate for the increased soil temperatures needed for seed starting. The Heat Mat Agritape 4' with Ground Screen is easily installed and removed, so bench space can be used for multiple purposes. The tape is rated 20 watts per square foot. Agritape Heat Mats distribute heat evenly over the entire mat surface, eliminating the cool spots typical of wire coil mats. Agritape Heat Mats should be used with a Thermostat.