Typical furnace repair in Central Texas lands between $150 and $500 for the common failures — igniters, flame sensors, limit switches — and $400 to $800 when a blower motor or control board is involved. A straightforward furnace replacement starts in the low $3,000s installed. Those numbers frame the whole decision, and the rule connecting them is simple: if the repair costs more than half of replacement, stop and do the bigger math.
Here’s the part-by-part version, with real ranges instead of national averages.
What furnace repairs typically cost
Ranges below are industry-typical for the Waco area, parts and labor together. Your written quote is the real number; these exist so nobody can quote you fiction.
| Problem you notice | Typical fix | Typical range | Lean |
|---|---|---|---|
| Clicks but won’t light | Hot surface igniter | $150–$300 | Repair |
| Lights, then shuts off | Flame sensor (clean or replace) | $80–$250 | Repair |
| Blows cold, keeps cycling | High-limit switch | $150–$350 | Repair |
| Weak airflow or none | Blower motor | $400–$800 | Depends on age |
| Dead, erratic, or possessed | Control board | $400–$700 | Depends on age |
Notice the shape of that table. The cheap half is ignition-side parts that wear out on every gas furnace eventually; they’re the tune-up-adjacent stuff, and they’re almost always worth fixing. The expensive half is motors and electronics, and that’s where age starts voting.
One thing before you price anything: a “broken” furnace is frequently a mis-set or suffocating one. The fan switch, the filter, and the registers solve a surprising share of no-heat mornings, and we put those free checks in order in furnace blowing cold air. For the wider symptom list across every heater type, start with 8 common heater issues.
The service call fee, explained without flinching
Every legitimate shop charges one, ours included. It covers the drive and the diagnostic time, and it’s the price of getting a real written quote instead of a phone guess. We took the whole thing apart in what an HVAC service call costs; the useful move is asking up front how the fee is handled if you approve the repair. Ask us and you’ll get a straight answer in writing.
The 50% rule, furnace edition
Take the repair quote and double it. If that beats the installed price of the furnace you’d actually buy, fix it. If it doesn’t, put the repair money toward the replacement.
A $220 flame sensor visit on a furnace of nearly any age: fix it, easily. A $700 control board on a 16-year-old builder-grade unit: that board is going into a machine whose blower, igniter, and heat exchanger all have 16 years on them too. The board might be perfect and the furnace still dies at 18. That’s the trap the 50% rule exists to catch, and the full replacement-side math (unit tiers, install variables, efficiency claims) lives in our furnace replacement cost guide.
Age brackets that break the ties
Furnaces last 15 to 20 years around here, a little longer than heat pumps because they only work one season.
Under 10 years: repair, almost regardless of the part. Even a blower motor buys you years.
10 to 15 years: the 50% rule decides. Ignition-side parts, yes. Big electronics, run the math honestly.
15 years and up: only the cheap fixes make sense. A $150 igniter on a furnace that heats well, fine. Anything north of $500, and you’re restoring a machine that’s already played its full season count.
One accelerator to know about: moisture. A furnace rusting in a humid closet or under a slow AC coil leak ages faster than the calendar says, and corrosion takes out ignition parts early. If yours is showing orange, read what furnace rust and corrosion mean before deciding which bracket you’re really in.
The repairs that shouldn’t happen
A cracked heat exchanger on an old furnace is a replacement conversation, not a repair one. The part is the furnace’s core, the job costs accordingly, and a tech who finds a genuine crack should show it to you, not describe it ominously. Ask to see it. Honest shops expect that.
The reverse scam matters just as much: nobody should sell you a new furnace over a flame sensor. It’s an $80-to-$250 fix. If a cheap ignition part somehow becomes a system-replacement pitch, that’s what free second opinions are for, and we give them.
And the second major repair in one season is the furnace telling you something. Machines fail in clusters at the end. We’d rather say that at the quote stage than collect twice.
How we’d play it
Get the diagnosis, get the number in writing, and make the age bracket break the tie. Our furnace repair visits work exactly that way: written assessment and quote before any work, price-match on the repair, and the 10% senior and military discount applies (repairs only). No surprises is the whole business model.
Common questions about furnace repair cost
What’s the most common furnace repair?
Is it worth repairing a 15-year-old furnace?
Why do furnace repairs cost more in winter?
How much is the service call fee?
Where to go from here
Furnace repair cost is a two-number question: the quote, and half the replacement price. Get both, let the age bracket vote, and don’t let anyone rush the math in either direction. When you’re ready for the real number instead of a range, request a written quote or call 254-640-2350 — straight answers are the whole point.
The On Point Team [CONFIRM byline] · On Point Service Company — family-owned HVAC & appliance repair, McGregor, TX · Serving Waco, Temple, Belton, and surrounding Central Texas towns · Licensed & insured, TDLR License TACLB00069239E · 254-640-2350
