Family-owned · Furnace Repair
Furnace Repair Service — Same-Day, Written Quotes
Your home is your fortress. We protect your comfort. No heat doesn't wait for business hours, and neither do we — 24/7 emergency furnace repair across Plainfield and Chicago's western suburbs.
Family-owned
Built on trust. Not private equity.
Premium service
Quality workmanship you can rely on.
Honest pricing
Straightforward. No games.
Always on call
Emergency calls answered 24/7 — even Sundays.
Heating
Furnace Repair Service
Same-day diagnostics whenever availability allows, a written quote before work starts, and a combustion safety check on every visit — not an upsell.
Other heating services
Furnace Repair
$150–$600Furnace Installation & Replacement
From $3,500Heat Pump Repair & Installation
From $4,500Heating Maintenance & Tune-Up
$89–$150
Furnace Repair
No heat on the coldest night of the year is an emergency. We answer the phone at 2 AM.
Ignitors, flame sensors, pressure switches, and inducer motors cause most no-heat calls. We stock all four. Every visit includes a combustion safety check at no extra charge.
- Ignition and flame-sensor diagnosis
- Heat exchanger inspection
- Carbon monoxide safety test
- Gas pressure verification
FortHouse's furnace repair service starts with same-day diagnostics whenever availability allows and a written quote before any work begins. Every visit includes a combustion safety check — not optional on a system that burns gas indoors.
Four parts cause most no-heat calls, in order of how often we see them: ignitors, flame sensors, pressure switches, and inducer motors. We stock all four on every truck, which is the difference between a same-visit repair and a second appointment.
Signs you need furnace repair, not just a filter change
A few of these point straight at a specific failed part; check the filter first regardless, since it's the cheapest possible cause and rules itself out in under a minute:
- [No heat at all](/blog/furnace-wont-turn-on), especially if the blower runs but no warm air follows — usually an ignition failure, not a total system death.
- Blowing cold or lukewarm air instead of shutting off cleanly between cycles.
- [Short cycling](/blog/furnace-short-cycling) — firing for a few minutes, shutting off, repeating — one of four specific, diagnosable causes, not random wear.
- Banging, screeching, or a repeated clicking that doesn't resolve on its own — usually an ignition or blower problem that won't fix itself.
- A yellow or flickering flame instead of steady blue — a combustion issue, and worth knowing the carbon monoxide signs that can come with it.
- A gas bill that's climbed with no change in weather or thermostat schedule — a furnace losing efficiency as a part starts to fail.
What a real furnace repair visit actually checks
Four things, every visit, not as an upsell: ignition and flame-sensor diagnosis (the two most common no-heat causes), a heat exchanger inspection (the one failure that can put combustion gases into the air), a carbon monoxide safety test, and gas pressure verification. A visit that skips straight to "it needs a part" without checking these isn't a shorter version of the same service — it's a different, less thorough one wearing the same name.
What furnace repair actually costs
Most furnace repairs run $150–$600, and the range comes down to which part failed and how accessible it is — an ignitor swap sits at the low end, a inducer motor replacement runs higher. Every repair gets a written quote naming the specific part before any work starts, not a phone estimate and not a vague number that grows once someone's inside the cabinet.
The four parts behind most no-heat calls
Worth knowing what's actually failing, not just that something is:
- Ignitors — the component that lights the burner. A cracked or weakened ignitor is the single most common cause of a furnace that won't start at all.
- Flame sensors — confirm the burner actually lit. Carbon buildup over a season makes them unreliable, which the control board reads as an ignition failure and responds to with a safety lockout, not a fire.
- Pressure switches — verify the venting is actually pulling exhaust before the gas valve opens. A stuck or miswired switch is a safety feature doing its job, even though it presents as "the furnace won't turn on."
- Inducer motors — pull combustion air through the system before ignition. When one fails, the furnace often won't attempt to light at all, since the pressure switch never confirms proper draft.
Emergency furnace repair: what's actually urgent
No heat with dangerously cold weather outside, especially with anyone vulnerable to cold in the house, is a real emergency — see the full breakdown of what qualifies and what can wait. A furnace that's still running, just less effectively, almost always can wait for a normal appointment instead of an after-hours one.
Furnace repair or replacement — the actual math
Not every furnace problem is worth fixing indefinitely. The 50% rule is the actual industry shorthand: if a repair costs more than half of what a new furnace would, or the furnace's age times the repair cost tops $5,000, replacement usually wins on value. A cracked heat exchanger or a second repair in one season both push that decision even when the math is close — real replacement pricing and what installation day covers is the other side of that math.
What to check before you book a furnace repair company
A few real questions separate a company solving your problem from one selling you a furnace:
- Will they name the specific failed part before quoting a price? A company that skips straight to a number without diagnosing anything is guessing, not repairing.
- Is the diagnostic visit itself real, or a loss leader? A price far under the cost of an honest visit isn't a discount — it's a sales call with a wrench in hand, and the upsell is the actual product.
- Are they licensed to pull permits in your specific township? Furnace repair involving gas line or venting work often requires one, and a company that doesn't know your township's process is a company still learning it on your job.
- Who actually owns the company? We're family-owned, not backed by private equity — a distinction that shows up in whether the incentive is to fix your furnace or hit a sales quota.
Furnace repair across the western suburbs
We run furnace repair calls across the whole service area every week, not occasionally — which means the crew showing up already knows the housing stock, the local permit process, and what a normal reading looks like for a furnace built the way yours was. Based in Plainfield? See our Plainfield-specific furnace repair page for that city's housing stock and response-time detail.
Service area
Furnace Repair across Chicago's western suburbs.
Common questions
Furnace Repair — frequently asked.
How much does furnace repair cost?
Most repairs run $150–$600 depending on the part and how accessible it is. Every visit gets a written quote naming the specific failed part before work starts, not a phone estimate.
How do I know if my furnace needs repair or replacement?
Run the 50% rule: if a single repair costs more than half of a new furnace, or the furnace's age times the repair cost tops $5,000, replacement wins on value. A cracked heat exchanger or a second repair in one season pushes the decision toward replacement even when the math is close.
What are the most common furnace problems?
A failed ignitor, a dirty flame sensor, a stuck pressure switch, or a failed inducer motor account for most no-heat calls. All four are diagnosable and usually fixable in a single visit.
Is no heat always an emergency?
It's a real emergency when it's dangerously cold outside, especially with anyone vulnerable to cold in the house. A furnace that's still heating, just less effectively, can typically wait for a scheduled appointment instead of an after-hours call.
Do you offer same-day furnace repair?
Yes, in most cases, plus 24/7 emergency service for genuine no-heat situations. We stock the parts behind most common failures — ignitors, flame sensors, pressure switches, inducer motors — on every truck.
What areas do you cover for furnace repair?
Plainfield, Naperville, Oswego, Yorkville, Bolingbrook, Wheaton, Lisle, Minooka, Shorewood, and Aurora, plus the rest of Chicago's western suburbs. If you're just outside that list, call anyway — we make exceptions for a reasonable drive.
How we work
You call, we diagnose with real measurements, you get a flat written number before anything starts, then we fix it and put the post-repair readings on the invoice next to the originals. See the full four-step process.
Book a visit
Tell Us What the System Is Doing
Describe the symptom and we will tell you what it usually means, what it typically costs, and the earliest available appointment. No obligation on the call.
- Weekdays
- 7:00 AM – 7:00 PM
- Saturday
- 8:00 AM – 4:00 PM
- Emergency
- 24 hours, 7 days
- Ownership
- Family-owned