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Steve I worry about these cooking on those hot days that spring up during the winter If I wrap the P-stem.
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You could also try wrapping the p-stem with attic insulation which doesn't really absorb heat, but insulates much better than shrink wrap.
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a candle in a coffee can will help keep them warm,well not freeze..
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Wouldn't a paraffin/ kerosene lamp be more cost effective, and give off more heat? I keep one of those in my greenhouse just in case we have extremely cold nights, and it works pretty well.