"There are some things beyond the ken of mortal man that shouldn't be tampered with. We don't know everything. There's plenty goin' on right now in the Twilight Zone that we don't know anything about and I think we oughta stay clear.
"They did have a fireplace. In the episode "Andy Saves Gomer", Gomer brings in enough firewood for many winters.
Not sure why they would need to keep the wood box filled during the summer months of this episode however!