Eggs will hatch at just about any "room" temperature. Between 80 and 85F, you get much quicker hatches, though, and the worms grow much faster, too. The beetles are far more active and will lay more eggs. Yes, it does require additional heat or keeping your worm farm near a heat source IF you desire speeded up life cycles. I have mine beside my wood stove so it stays around 80-85 when the stove is going in the winter. I heat tubs of hot water to place under the worm and beetle trays to keep them warm all night until I start the fire in the wood stove in the morning again.
Note: I went back and edited my original post to reflect this clarification.
Note: I went back and edited my original post to reflect this clarification.
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