I like your idea of keeping the soil warm. My peppers didn't want to grow last year either. I ended up buying about a dozen transplants. Eventually the plants I started caught up in size, and they produced like crazy but all were very late. Wish I had been more patient and saved $$.
Foam boards (I use the lid of a foam beach cooler) placed under a heat mat helps to direct the heat upwards to the soil, rather than heat the table or shelf beneath the mat. The gain is only2-3 degrees, not anywhere near 90 degrees, but better than wasting that heat - Lisa.
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