Brian, about now you should be watching for heat buildup during the day. As Worth mentioned, substantial heat buildup can occur. I baked a flat of onion seedlngs in my coldframe a couple of springs ago. If you prop open the lid, make sure you put a weight on top of the lid as well to keep it from trying to turn into a kite if the wind kicks up.
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--Ruth
Some say the glass half-full. Others say the glass is half-empty. To an engineer, it’s twice as big as it needs to be.
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