Seedling heat mats
I am new to starting seeds indoors using a seedling heat mat, I bought the heat mat and the automatic thermastat. I have the setup in the basement which is around 55-60 degrees. The thermastat states that if the heat mat stays on for more than 5 hours at a time to add something under the mat to hold in the heat. Any suggestions?
The setup: Sunlight table growlight, 4' L heat mat on top of the growlight base (the base is partially filled in with ceramic tile because the mat is larger than the base and doesn't fit inside the base). I put a cardboard box over the trays (because the seeds need the dark to germinate).