In 1991 I camped with five other guys on an elk mule deer hunt in the Arapaho Natl. Forrest near Kremling Colo. two weeks in a very large cabin tent. Daytime temp hovered around 30 degrees, nights were bitter cold, but in the tent we were in tee shirts. very comfortably. We had a propane heater that kept the inside temp, I'm guessing around 70 degrees. Hope this helps. I would definitely do it again if I wasn't so darn old.