There's a whole group on this forum that have hatched refrigerated eggs purchased from the supermarket (see Trader Joe's Hatching Club), so it is not unheard of to get little cheepers from chillin' eggs.
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Different Still-Air topic:
I've found with winter weather that draping a folded beach towel around the incubator helps to stabilize the temperature within. Wasn't so much of an issue in the summer, but we've got a huge temp swing at night. Just bundle up the incubator except for the red plugs and vent holes and make sure the drape is down past the seam of top and bottom.
- - -
Different Still-Air topic:
I've found with winter weather that draping a folded beach towel around the incubator helps to stabilize the temperature within. Wasn't so much of an issue in the summer, but we've got a huge temp swing at night. Just bundle up the incubator except for the red plugs and vent holes and make sure the drape is down past the seam of top and bottom.