Hi C-H's, I bought an electric seed tray heater recently and thought you might like to know the details. Vendor: dogstarlabs.com Product Number: SHM300 Description: Hydrofarm Seedling Mat, 12" x 20" Price: $20.66 Quantity: 1 Unit Subtotal: $20.66 ---------------------------------------- Subtotal: $20.66 Shipping & Handling: $6.65 (Boise Idaho -> Dublin Ohio USA) Tax: $0.00 Total: $27.31 ---------------------------------------- When placed on the concrete floor of our basement (ambient temp = 20degC/68degF) the seed tray stabilized at 27degC/80degF. When a sheet of 1" thick laminated counter top (chipboard) was put on the floor under the mat the tray stabilized at 32degC/90degF. I hope this helps you find your preferred temperature of germination. [I have no connection with Dogstarlabs or Hydrofarm] -- --- Regards, Cameron.