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 · 4,400+ reviews
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4.9★ on Google
4,400+ reviews
24/7 Emergency
60–90 min dispatch
Licensed & insured
LA Master Plumber #1874
North Louisiana
Ruston to Shreveport
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, Shreveport, Bossier City, 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 Classic Membership: $189/year covers 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 membership discount.
Expires 12/31/2026
WAIVED
Service call with completed repair
$89–$129 value, applied to your repair.
Expires 12/31/2026
15% OFF
Repairs for Classic Members
Requires active Classic Membership ($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, Shreveport, Bossier City, 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
What furnace repair costs in North Louisiana
Flat-rate, quoted before work starts. Your service call is waived when we do the repair. Classic Membership members get 15% off.
Diagnostic / service call
Waived with repair
Standard
$89–$129
Member · save 15%
$76–$110
Flame sensor or igniter replacement
Most common no-heat repair
Standard
$150–$350
Member · save 15%
$128–$298
Blower motor capacitor
Standard
$150–$300
Member · save 15%
$128–$255
Pressure switch or limit switch
Standard
$150–$350
Member · save 15%
$128–$298
Inducer motor replacement
Standard
$450–$850
Member · save 15%
$383–$723
Blower motor replacement
Standard
$400–$900
Member · save 15%
$340–$765
Gas valve or control board
Standard
$450–$1,100
Member · save 15%
$383–$935
Thermostat replacement
Smart thermostats $250–$600
Standard
$150–$450
Member · save 15%
$128–$383
Heat exchanger replacement
Often favors full replacement on older units
Standard
$1,500–$3,000
Member · save 15%
$1,275–$2,550
After-hours emergency repair
Nights, weekends, holidays
Standard
$175–$950
Member · save 15%
$149–$808
Member pricing reflects the Classic Membership 15% repair discount. Service call fees are separate.
Ranges are typical for North Louisiana homes. Your exact price is quoted flat-rate after diagnosis, before any work begins.
Classic Membership
One plan. Whole-home peace of mind.
For $189 a year, members get 15% off every HVAC and plumbing 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
Classic Membership
$189/year
One flat yearly price covers your whole home — everything listed, no per-visit fees, no surprises.
Questions? (318) 319-0220
Cancel anytime · 1-yr min
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 |
| Typical cost | $150 – $1,100 | $3,200 – $8,500 installed |
| 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
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.
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