Just to add a bit of temp info - thanks, Fusion, for the reminder - the temp in my office, where I germinate seeds, is typically 65-70 degrees - the heat mats are not variable temp but tend to run at 80 deg or so....therefore, maybe give a few degrees rise to the soil temps. When the sun shines in, the temps must get nice and toasty under the loosely draped plastic....I've never measured it. I do flip the plastic once a day at least - you get quite a bit of condensation with the delta between surface temp and room temp toward the end of the day.
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Craig
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