Why this post exists
Homeowners are often told that any cracked heat exchanger is an immediate life-safety emergency that requires instant furnace replacement. This message is usually delivered with alarming language, unclear camera images, and very little explanation of how furnaces actually work.
This article is not arguing that cracked heat exchangers are harmless or should be ignored. Instead, it explains why continuous carbon monoxide (CO) monitoring can be a more practical, objective, cost-effective and homeowner-friendly safety strategy than routine, speculative heat-exchanger inspections — especially in modern homes with modern furnaces. The goal is simple: focus on real risk, not fear.
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