This is a really good reason to burn books
Funny signs make me laugh, and this sign is witty, funny, humorous. This is true, but you could always check out a bunch and burn books after you read them. Become informed and learned, and keep warm at the same time. It’s straight to the point, tells the truth, is hopelessly optimistic, absurd as it is, but it left something out of the list of possibilities: You could burn the book and be warm. Not if it was a kindle of course, that would be stupid. I wonder if this actually got them any business? I’ll bet it did, people love witty signs.