Introduction: The Hidden Heart of Your Heating System When the freezing winter winds whip off Lake Ontario and funnel through the lower city of Hamilton, your residential heating system becomes the absolute lifeline of your home. You rely on your furnace to ignite flawlessly, distribute warmth evenly, and shut down safely thousands of times over the course of a single winter season. Yet, despite interacting with the thermostat daily, most homeowners never give a second though