Furnace Repair
FURNACE REPAIR IN NORTH LOUISIANA
No heat, short cycling, or a furnace that won't stay lit? Our licensed techs diagnose and fix gas and electric furnaces fast — flat-rate, answered live 24/7.
4.9 · 3,569 reviews (2 profiles)
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4.9★ on Google
3,569 reviews · 2 profiles
24/7 Emergency
Call for current availability
Licensed & insured
LA Master Plumber #1874
North Louisiana
Ruston to Monroe
Flat-rate pricing
Quoted before we start
Overview
Heat Back On — Usually the Same Visit
When a North Louisiana cold snap rolls in and the furnace quits, you don't want a runaround — you want the licensed crew you already trust to show up, find the real problem, and fix it. Mark Johnson & Sons has kept homes warm across Ruston, Monroe, West Monroe, and Grambling since 1997, and we repair every major gas and electric furnace brand: Carrier, Trane, Lennox, Goodman, Rheem, York, American Standard, Bryant, and Amana.
Most no-heat calls come down to a handful of parts. A dirty flame sensor or a cracked hot-surface igniter kills ignition; a failed blower capacitor or motor stops air from moving; a tripped high-limit switch, a bad gas valve, a failing inducer, or a corroded control board locks the furnace out on safety. Our trucks carry the common ones, so the majority of repairs finish in a single visit — flat-rate, quoted before we start, service call waived when you do the repair.
What we repair
- Ignition faults — flame sensors, hot-surface and spark igniters, pilot assemblies
- Airflow problems — blower motors, run capacitors, and control boards
- Gas & safety controls — gas valves, pressure switches, high-limit and flame-rollout switches, inducer motors
- Thermostat & wiring faults — dead, miswired, or short-cycling thermostats
- Heat exchangers — inspected on every no-heat call for carbon-monoxide cracks
Repair vs. replace
If your furnace is under about 12 years old and the repair runs less than a third of a replacement, fixing it is almost always the smart money. Once a unit is 15+ years old, breaking down every season, or showing a cracked heat exchanger, replacement usually wins — the repeat repairs and the fuel a worn furnace wastes add up faster than most people expect. We give you the honest math and a flat-rate quote on both, with zero pressure to buy a system you don't need.
What Mark Johnson & Sons does differently
Every tech is on our payroll — no subcontractors — and every quote is flat-rate, based on the job, not an hourly meter running while we diagnose. We answer live 24/7, and no-heat calls during a hard freeze get priority dispatch. Ask about our service savings agreement plans: from $189/year, covering a Fall heating tune-up and a Spring AC tune-up, 15% off every repair, and front-of-line scheduling on the freezing nights when everyone else is calling too.
Free quote
Get your furnace fixed fast
Tell us the symptom — no heat, short cycling, a smell, a furnace that won't light — and we'll get a licensed tech out with a flat-rate quote before any work starts.
4.9★
24/7
Emergency
Free
Quote
Current coupons
View all$50 OFF
Any furnace repair
One per household. Mention at booking. Not combinable with service savings agreement discount.
Expires 12/31/2026
WAIVED
Service call with completed repair
Diagnostic fee applied to your repair.
Expires 12/31/2026
15% OFF
Repairs for service members
Requires active Service Savings Agreement Plan ($189/year).
Expires 12/31/2026
Mention coupon when booking. One offer per household.
Warning signs
Signs your furnace needs a repair
Catch these early and a small fix stays small. Ignore them and you risk a no-heat night.
No heat, or air blowing cold when the thermostat calls for heat
Furnace short cycles — turns on and off every few minutes
Loud banging, screeching, grinding, or rattling when it fires up
Burner flame is yellow or flickering instead of steady blue
Rotten-egg or burning smell (shut it off and call right away)
Heating bills jumped with no change in the weather
The blower runs constantly or never comes on at all
Furnace clicks and tries to light but won't catch
System keeps tripping the breaker when it starts
24/7 dispatch
No heat on a freezing night? We answer live and roll out.
A dead furnace in a hard freeze isn't a next-week problem — especially with kids or older family at home. Emergency heating calls get a licensed tech on-site fast, any hour, any day.
Answered live
24/7
Across Ruston, Monroe, West Monroe, and North Louisiana.
The Process
How we handle a furnace repair
On the truck
Professional tools, parts, and diagnostics — every call.
Live phone triage
A real person answers 24/7, gets your symptoms, and books the first available slot — priority for no-heat calls.
Full diagnostic
We check ignition, flame sensor, gas pressure, blower, capacitor, limit and safety controls — and confirm the actual cause, not a guess.
Flat-rate quote up front
You get the price before we touch a tool. If it's a safety issue like a cracked heat exchanger, we show you and explain your options.
Repair on the spot
Common parts are on the truck, so most repairs finish the same visit. We test the full heat cycle before we leave.
Safety verification
We confirm clean ignition, proper airflow, and safe operation, and leave your system running the way it should.
Pricing
How We Price Furnace Repair
Flat-rate, quoted before work starts. Your service call is waived when we do the repair. Service members get 15% off.
Flat rate, quoted before we start
You get the full price for the job up front — not an hourly meter you watch climb. You approve it before a tool comes out of the truck.
The quote is the price
It doesn't move once work begins. If something unexpected turns up behind a wall or under a slab, we stop and talk it through with you before going further.
Service members save 15% on every repair
Service savings agreements start at $189 a year and take 15% off all plumbing, heating, and cooling repairs, with priority scheduling on every call. The Premium Service Savings Agreement Plan adds same-day service and drops after-hours charges entirely.
Financing available
Bigger jobs — a system replacement, a repipe, a sewer line — can be financed through GoodLeap. Apply online in a few minutes.
Every job is priced for your home and what it actually needs — tell us what's going on and we'll get you a firm number, free and with no obligation.
Service Savings Agreement Plans
Two plans. Whole-home peace of mind.
From $189 a year, service members get 15% off every plumbing, heating, and cooling repair, two complete HVAC tune-ups, a free plumbing and drain check-up, and priority scheduling on every call.
- 15% off repairs
- Priority scheduling
- 2 HVAC tune-ups/yr
- After-hours discounts
- $25 savings certificate
- Guaranteed flat-rate
Service Savings Agreement Plan
$189/year
Everything it takes to keep the house maintained and your repairs discounted.
Each additional HVAC unit is $89/year
Premium Service Savings Agreement Plan
$389/year
Everything in the Service Savings Agreement Plan, plus no after-hours charges, no travel fees, and same-day service.
Each additional HVAC unit is $89/year
Questions? (318) 319-0220
1-year term · does not auto-renew
Compare
Repair or replace your furnace?
When a repair quote lands, the age and condition of the unit decide whether fixing it or replacing it is the smarter money. Here's how we think it through with you.
| Feature | Repair | Replace |
|---|---|---|
| Best when the furnace is | Under ~12 years old | 15+ years old |
| Heat exchanger | Sound, no cracks | Cracked or corroded |
| Efficiency | Keeps current AFUE | New 80–95%+ AFUE, lower bills |
| Warranty | Part-only, short term | New manufacturer warranty |
| Right call if | Fix under 1/3 of replacement | Repeat breakdowns or safety fault |
FAQ
Furnace Repair FAQs
Do you repair all furnace brands?
Yes — every major gas and electric brand, including Carrier, Trane, Lennox, Goodman, Rheem, York, American Standard, Bryant, and Amana. We carry common ignition, flame-sensor, capacitor, and blower parts on the truck so most no-heat calls are fixed in a single visit.
How fast can you get out for no heat?
No-heat calls are a priority. Most get a same-day slot, and true emergencies during a hard freeze get fast dispatch 24/7, including weekends and holidays. Service members jump the line when the phones are slammed.
How much does a furnace repair cost?
What a repair costs comes down to the part — a flame sensor or igniter is at the cheap end, a blower motor higher, and a gas valve or control board the priciest of the common failures. The diagnostic is a flat fee, waived when you do the repair, and everything is flat-rate and quoted before we start.
My furnace turns on then shuts right off — what's wrong?
Short cycling usually points to a dirty flame sensor, an overheating limit switch from restricted airflow (often a clogged filter), or a failing control board. It's worth fixing quickly — short cycling wears parts out fast and drives up your bill.
Should I repair or replace my furnace?
If the furnace is under about 12 years old and the repair is less than a third of replacement cost, repair usually wins. Older units, repeat breakdowns, or a cracked heat exchanger favor replacement. We give you the honest math and a flat-rate quote on both.
Is a rotten-egg or burning smell an emergency?
A rotten-egg or sulfur smell can mean a gas leak — turn the system off, leave, and call us (and your gas utility) right away. A brief burning-dust smell on the season's first run is normal; a persistent electrical or burning smell is not — shut it down and call.
Can I fix my furnace myself?
You can safely swap the air filter and check that the thermostat has power and the furnace switch is on. Beyond that, no-heat repairs involve gas, high-voltage, and safety controls that are dangerous to test wrong — a bad diagnosis on a cracked heat exchanger can be a carbon-monoxide risk. Anything past the filter is worth a licensed tech.
Why does my furnace keep tripping the breaker?
A furnace that trips its breaker usually has a shorted blower motor, a seized inducer, or a control-board fault drawing too many amps. Don't keep resetting it — repeated trips can damage wiring and the board. We find the short and fix the root cause, not just reset it.
Do you offer a maintenance plan to prevent breakdowns?
Yes. The $189/year Service Savings Agreement Plan includes a complete Fall heating tune-up plus a Spring AC tune-up and an annual plumbing check-up, 15% off repairs, and priority scheduling — the cheapest way to avoid a no-heat night. See [service savings agreement plans](/quality-service-club/).
Do you offer financing if it turns out I need a new furnace?
Yes. If diagnosis shows replacement is the better call, we offer financing on system replacements so a failed furnace doesn't have to be paid all at once, and the diagnostic still applies. Ask about current terms when we quote it.
Related services
Related heating services
What furnace repair calls often lead to on the same visit.
Furnace Installation
When repair isn't the smart call — right-sized, code-compliant replacement, quoted flat-rate.
Furnace & Heating Maintenance
A Fall tune-up that heads off the no-heat call before it happens.
24/7 Emergency Heating
No heat after hours? Licensed tech dispatched fast, any day.
Available Around the Clock
Emergency?
We answer 24/7.
Burst pipe, water heater out, sewer backup? Real plumbers pick up — no answering machines. Mark Johnson & Sons Plumbing serves North Louisiana any time, day or night.
LA Master Plumbing #1874 · Backflow Cert #28131 · Master Natural Gas Fitter #LMNGF9062 · State Contractors #35794