WA Lic. INFINHA841B8 400+ Google reviews
Quick answer
- A cracked or corroded heat exchanger is a carbon monoxide safety issue, not a repair-vs-replace debate — that's a replace, full stop.
- Furnaces installed 12–15+ years ago are near or past the point where a major-component repair rarely makes financial sense.
- Two significant repairs inside 12–18 months on the same furnace is the real signal to stop repairing and start planning replacement.
- A single blower motor, capacitor, or igniter repair on a furnace under 12 years old is almost always worth doing.
The age line that actually matters
A well-maintained gas furnace typically runs 15–20 years. Past 15 years, replacement parts get harder to source, efficiency has usually degraded from wear, and any major-component repair is competing against a furnace that's already near the end of its expected service life.
Which repairs are 'fix it and move on'
Igniters, flame sensors, capacitors, blower motors, and control boards are common, moderate-cost repairs that don't indicate the whole unit is failing — they're wear items, and replacing one on a furnace under 12 years old is almost always the right call.
Which repairs are a hard stop
A cracked or corroded heat exchanger is a carbon monoxide risk in a furnace that's typically already aging — this is a safety decision, not a cost comparison. A rusted-through cabinet or a failed gas valve assembly on an older unit falls into similar territory.
The math beyond the repair bill
Repeated repairs, gradually declining efficiency, and the option to add cooling capacity (via a heat pump conversion) at replacement time all factor into the real decision — not just the dollar figure on the latest repair invoice.
Where this decision goes wrong
Patching a heat exchanger crack
Some cracks can technically be welded, but a cracked heat exchanger is a carbon monoxide safety issue in a system that's usually already old. Continuing to run it — patched or not — puts a real safety question ahead of a savings decision.
The repair-and-repeat cycle
Fixing the same aging furnace three times across two winters while telling yourself each repair is 'the last one' usually adds up to more money spent than the furnace was worth — and you still end up with an unreliable system.
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Family owned · WA Lic. INFINHA841B8 · 400+ Google reviews
Common questions
How do I know if my furnace has a cracked heat exchanger?
Warning signs include an unusual odor, soot near the unit, a yellow or flickering flame instead of steady blue, or a carbon monoxide detector alarm. A technician confirms it with a combustion analyzer and visual inspection — this isn't something to guess at yourself.
Is it worth repairing a furnace that's still under manufacturer warranty?
Usually yes for parts covered under the warranty — labor is still billed separately, but a covered part turns an otherwise-marginal repair into an easy call.
Can I replace just the furnace and keep my existing air conditioner?
Often, yes — but we check that your existing AC's refrigerant type and coil match the new furnace's airflow first. A mismatched pairing loses efficiency even if both pieces technically run.
Should I switch to a heat pump instead of buying another furnace?
It's worth asking at replacement time. A heat pump adds cooling capacity and can handle most South Sound heating days on electricity alone. We'll walk through both a furnace replacement and a heat pump option against your actual home before you decide.
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Infinity Heating & Air — licensed WA HVAC contractor (Lic. INFINHA841B8), family-owned in Graham. Last updated 2026-07-14.