Proper soil temperatures are a must for successful seed germination. Normal greenhouse or room air temperatures usually are not high enough to compensate for the increased soil temperatures needed for seed starting. Agritape Heat Mat Systems are 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 typically found in wire coil mats.