Harsh Northern Ontario winters can push your furnace to the limit. But how do you know when it's time to replace it — before you're left in the cold? In this post, we break down 5 clear signs that your furnace might be on its last legs, especially for homes in Sault Ste. Marie and the Algoma Region. From rising energy bills to strange noises, learn what to watch for — and how to stay warm, efficient, and worry-free.