How Your Furnace Actually Works
The combustion cycle, heat exchanger, and blower assembly — explained simply.
Your furnace pulls in cold air, sends it past a heat exchanger warmed by burning natural gas, and pushes the heated air back through your ducts. The heat exchanger is the critical component: if it cracks, carbon monoxide can leak into your home. That is why we pressure-test it every single visit.
Takeaway: Schedule a furnace inspection every fall before heating season. A cracked heat exchanger is a CO risk — don't skip it.