Re: comparisons of heat mat costs and performance
From a different angle: what about cooling, or more specifically, keeping the the temps reasonable? Cincy and SD or different (for one thing, your football team beat mine!), but one major concern I have run across in spring is the wide variety of temps. Overnight, it may well be 35 degrees, but then during the day 60, maybe 70. Inside a grow box, if it isn't open, it could easily get to 135, frying your seeds/seedlings.
Mike
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