I have been waiting for it to be mentioned, but since I have not seen it yet here I go.... The easiest and least expensive way I have seen /used to provide some heat for seed flats is to simply use either an old electric blanket or a heating pad. Plastic can be placed over the pad or blanket to protect it from moisture. The temperature is adjustable, and with the blanket a lot of area can be warmed. good luck to all with your plant babies! Suz Suzanne M. Fike Graduate Research Assistant Microelectronics Research Center Georgia Institute of Technology work: (404)894-9918 sfike@ee.gatech.edu home: (404)352-1399 suz@avana.net