I've got a 2 ft x 4 ft heat mat that gets too hot, so I connected a dimmer switch to it and I can raise and lower the temp, although it is pretty much a shotgun adjustment. I also place some plastic covers under my trays that provide about 1/2" space between the mat and the trays and that buffers the heat. I'm getting good, speedy germination with my peppers and tomatoes.
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