We heat via wood stove. When loaded and cranking it can hit 90, and overnight drop to 60 before the furnace kicks in if some one forgets to load it.That's a tough one, I don't remember testing mine against that low of a temperature. I do think it might struggle to hold temps. Maybe someone else will chime in. My incubators held their own in a room around 60-65°F but unless I'm forgetting, I don't recall anyone mentioning keeping it in a room that cold.