What is a heat exchanger and why does a crack matter?
The heat exchanger is the sealed metal chamber inside a furnace that separates the toxic combustion gases from the clean air blown into your home. A crack lets those gases — including carbon monoxide — mix into the air you breathe, which is why a suspected crack is treated as a serious safety concern.
Can a home inspector confirm a cracked heat exchanger?
A home inspection is visual, so we screen for the signs of a crack — visible damage, soot, flame disturbance when the blower starts, corrosion, and CO readings — but a definitive diagnosis requires a licensed HVAC technician with a camera and combustion analyzer. When we suspect a crack, we flag it for that specialist before closing.
What causes a heat exchanger to crack?
Repeated heating and cooling cycles fatigue the metal over years, and the long Hutchinson heating season accelerates it. Restricted airflow from dirty filters or closed registers, oversized furnaces that short cycle, and plain old age all add stress that leads to cracks.
Is it safe to run a furnace with a cracked heat exchanger?
No. If a crack is confirmed, the furnace should be shut down until it's repaired or replaced because of the carbon monoxide risk. We always recommend working carbon monoxide detectors and prompt evaluation by a licensed HVAC contractor.
Does the home inspection check for carbon monoxide?
We inspect the venting, combustion air, and visible heat exchanger for the conditions that produce carbon monoxide, and we confirm CO detectors are present. Screening for heat-exchanger problems is part of the standard 120-point inspection at no extra fee.
