It is great that we no longer have to try to keep ourselves warm by lighting up a fire in the middle of our living rooms, or in each room. The safety, comfort, and efficiency that we get to enjoy thanks to modern heating systems like the furnace are pretty incredible when compared to anything that was used to provide comfort 200 years ago.
With that said, your furnace isn’t perfect. It will eventually need repairs and while some repairs are relatively simple, there are others that are best addressed by a professional as quickly as possible. Why? Because there is one repair need in particular that your furnace can develop that is flat out dangerous.
This is your reminder that a cracked heat exchanger is not a furnace malfunction to be ignored.