Reliable Furnace Repair and Replacement Services
Furnace Repair & Installation
London Ontario
Hawana HVAC Solutions repairs and installs gas furnaces across London Ontario and Southwestern Ontario — $175 diagnostic with same-day emergency repair, and new gas furnace installation from $3,400 including Manual J load calculation, permit, and old unit removal. The furnace is the most critical system in a London Ontario home: temperatures regularly reach minus 20°C and a furnace failure in January is a life-safety emergency, not an inconvenience. 24/7 zero after-hours surcharge. Goodman, Napoleon, Carrier, Lennox. Enbridge $650 rebate handled for qualifying 95%+ AFUE models. No rental. No monthly subscription. TSSA certified. BBB A+. 138 five-star reviews.
London Ontario Furnace Services — Repair & Installation
Whether your furnace stopped working at midnight in January or you need a planned replacement of an aging unit, Hawana covers both — with published pricing before any consultation.
🔥 Furnace Repair
Same-day emergency. Applied to repair cost. Written repair vs replace recommendation at every visit. Most common repairs completed same visit when parts available.
- Hot surface ignitor: $150–$300
- Flame sensor: $150–$250
- Inducer motor: $300–$500
- Gas valve: $300–$500
- Control board: $350–$550
- Blower motor: $300–$500
- Heat exchanger: $800–$1,500
- 24/7 zero surcharge — same rate always
🔥 Furnace Installation
Goodman, Napoleon, Carrier, Lennox. Manual J cooling load included. Enbridge $650 handled. Old unit removed. Permit included. No rental.
- Goodman / Napoleon gas: from $3,400
- Carrier / Lennox gas: from $4,200
- Propane furnace: from $3,900
- Combo furnace + AC: from $6,500
- Combo furnace + tankless: from $6,500
- Enbridge $650 rebate — 95%+ AFUE qualifying
- Free Manual J at every estimate
- No rental · No monthly subscription
How a Natural Gas Furnace Works — Key Components Explained
Understanding the heating cycle explains why specific failures happen and what each component repair costs. This is the information Hawana shares at every diagnostic visit.
The Heating Cycle — What Happens When the Thermostat Calls for Heat
When the thermostat calls for heat, the furnace control board initiates a sequence: first the inducer motor runs to purge the heat exchanger of any residual gas; the pressure switch confirms the inducer is creating the required draft; the hot surface ignitor glows red-hot (about 1,100°C); the gas valve opens and gas flows to the burners; the ignitor ignites the gas; the flame sensor confirms the burner is lit; the heat exchanger heats up; and finally the blower motor starts to circulate heated air through the ductwork. The entire startup sequence takes about 60 to 90 seconds. A failure at any step causes the furnace to shut down and display a fault code.
The Heat Exchanger — The Most Critical Component
The heat exchanger is the metal chamber that separates combustion gases from the air that circulates through your home. Combustion gases are contained inside; the blower pushes air over the outside. A cracked heat exchanger allows combustion gases including carbon monoxide to enter the air supply — this is a life-safety issue. Hawana inspects the heat exchanger at every diagnostic and maintenance visit.
Two-Stage vs Single-Stage vs Modulating
Single-stage furnaces fire at 100% output every time — on or off. Two-stage fire at approximately 65% for mild cold days, stepping to 100% only when temperatures drop significantly. Modulating units vary output continuously from 40% to 100%. Two-stage is the right choice for most London Ontario homes — the longer, quieter cycles at 65% output maintain more consistent temperature and better humidity control than single-stage, without the cost premium of modulating.
Gas Furnace — Heating Cycle Sequence
1. Thermostat Calls for Heat
Control board receives 24V signal. Initiates startup sequence. Checks safety limits first.
2. Inducer Motor Runs
Purges heat exchanger of residual gas. Pressure switch confirms adequate draft. If pressure switch fails — furnace stops here.
3. Hot Surface Ignitor Glows
Silicon carbide or silicon nitride element heats to ~1,100°C. Most common single failure point. Replacement $150–$300.
4. Gas Valve Opens — Burners Ignite
Gas flows to burner assembly. Ignitor lights the gas. Flame sensor rod in the flame proves ignition. Dirty sensor = furnace shuts down after 2–3 seconds.
5. Heat Exchanger Heats Up
Combustion gases heat the steel heat exchanger. Air circulates over the outside. A crack here = carbon monoxide risk.
6. Blower Motor Starts
After heat exchanger reaches set temperature, blower pushes warm air through ductwork. Air returns through return grilles and the cycle continues.
8 Most Common Furnace Failures — Symptoms & Repair Costs
These cover over 90 percent of furnace repair calls in London Ontario. Each repair cost includes parts and labour. $175 diagnostic applied to repair cost.
Hot Surface Ignitor Failure
$150–$300The most common furnace failure in London Ontario. The silicon carbide ignitor cracks or loses resistance and cannot reach ignition temperature. Furnace goes through startup, gas valve opens, but no ignition occurs. Typically same-visit repair. Ford K.'s review: diagnosed in 15 minutes, repaired same evening.
Flame Sensor Dirty / Failed
$150–$250The flame sensor rod accumulates oxidation from combustion. A dirty sensor cannot generate sufficient microamp signal to prove the flame is lit — the control board shuts off gas within seconds as a safety measure. Cleaning or replacement. Annual maintenance prevents this. Mire B.'s review: furnace firing and shutting down every few minutes — diagnosed and repaired in under 30 minutes.
Inducer Motor Failure
$300–$500The inducer motor creates the draft that vents combustion gases and proves to the pressure switch that venting is working. A failed inducer means the furnace will not complete the startup sequence. A grinding or squealing noise from the furnace before shutdown is often an inducer bearing failing. Part may require sourcing — 1 to 2 days in some cases.
Pressure Switch Failure
$150–$300The pressure switch confirms the inducer is creating adequate draft. A failed switch — or a blocked condensate drain on high-efficiency furnaces that floods the pressure switch port — prevents the startup sequence from proceeding. Blocked condensate line is a common London Ontario winter repair when the drain line freezes or clogs.
Gas Valve Failure
$300–$500The gas valve is a solenoid-controlled valve that opens to allow gas to the burners. A failed gas valve means the ignitor glows, the pressure switch proves, but no gas flows and no ignition occurs. On furnaces under 15 years old, gas valve replacement is worthwhile. On furnaces over 15 years old with this failure, replacement of the entire furnace is usually more cost-effective.
Control Board Failure
$350–$550The control board is the furnace's brain — it sequences the startup and monitors safety inputs. Failed control boards cause unpredictable symptoms including random fault codes, failure to initiate startup, and components running out of sequence. On furnaces under 12 years old, control board replacement is worthwhile. On older furnaces with this failure, the repair vs replace calculation is close.
Blower Motor Failure
$300–$500The blower motor circulates heated air through the ductwork. A failed blower means the heat exchanger heats up but no air moves — the furnace overheats and shuts on the high-limit switch. ECM (variable-speed) blower motors on modern furnaces are more expensive to replace than PSC motors on older units. Annual lubrication on older motors extends motor life.
Cracked Heat Exchanger
$800–$1,500 repair or replaceA cracked heat exchanger allows combustion gases including carbon monoxide into the air supply. On a furnace under 15 years old, heat exchanger replacement ($800 to $1,500) is an option. On a furnace over 15 years old, replacement of the entire furnace is almost always more cost-effective and safer. If you suspect a cracked heat exchanger (yellow/orange flame, soot, headaches), shut down the furnace and call Hawana immediately.
Repair vs replace threshold: If any furnace repair exceeds $1,700 (50% of a $3,400 new gas furnace), or if the furnace is over 15 years old and requires a significant repair, Hawana recommends replacement and provides written quotes for both options at the same $175 diagnostic visit. A new 96% AFUE Goodman with the Enbridge $650 rebate nets at approximately $2,750 — making the repair vs replace calculation particularly important. Call (647) 550-4220.
Furnace AFUE Ratings Explained — Ontario 2026
AFUE (Annual Fuel Utilization Efficiency) is the percentage of gas that is converted to usable heat. The rest is wasted as exhaust. In London Ontario where furnaces run 5 to 6 months a year, AFUE matters significantly.
Standard Efficiency
20 cents of every gas dollar wasted as exhaust through a chimney flue. Uses metal B-vent chimney. Lower upfront cost but higher operating cost. Does not qualify for Enbridge $650 rebate. Rare in new London Ontario installations since 2015.
Mid-Efficiency
8 cents of every gas dollar wasted. Still uses a chimney flue. Qualifies for some rebates. Uncommon in new installations — the cost premium over 80% is rarely worth it given how close 96% is in price.
High Efficiency — Recommended
Only 4 cents of every gas dollar wasted. Uses PVC condensate exhaust — no chimney required. Qualifies for Enbridge $650 rebate (95%+ AFUE). Standard Hawana installation for all new London Ontario furnaces. Annual gas savings of $250–$500 vs 80% AFUE.
🌿 Enbridge Home Efficiency Rebate — Gas Furnace
The Enbridge HER provides up to $650 for qualifying natural gas furnace installations in Ontario. Hawana handles all rebate documentation after installation at no charge. The cheque goes directly to you. This rebate applies to furnaces only — not heat pumps, air conditioners, or water heaters.
Gas Furnace Brands — What Hawana Installs in London Ontario
All brands at published pricing. No brand lock. Manual J at every installation. Enbridge $650 rebate handled for all qualifying 95%+ AFUE models regardless of brand.
Made in the USA. 96% AFUE. 10-year parts warranty. Strong dealer network. Hawana's most recommended brand for London Ontario homeowners — best value for quality. Most common replacement choice for homeowners upgrading from any brand.
Manufactured in Barrie, Ontario. 96% AFUE. Strong warranty. Good parts availability in Canada. Popular choice for homeowners who prefer a Canadian-manufactured product. Propane-rated models available — particularly suited for rural Southwestern Ontario properties.
One of the most recognized HVAC brands in North America. Infinity series modulating furnaces offer the highest comfort and efficiency. Strong Canadian dealer network for parts. Premium build quality with a price premium to match. Good choice for homeowners who want the brand name and premium comfort features.
SLP98V modulating furnace is among the quietest and most efficient available (up to 98% AFUE). iComfort smart thermostat integration. Lennox has a strong dealer network in London Ontario. Premium pricing reflects premium build and feature quality. Comparable to Carrier for quality — choice often comes down to dealer relationship and thermostat preference.
York and Trane occupy the middle tier — above Goodman in pricing but below Carrier and Lennox. Both have solid reliability records in Ontario. Trane is particularly well-regarded for heat exchanger durability. Available through Hawana at published pricing.
Hawana's recommendation for most London Ontario homeowners: Goodman 96% AFUE two-stage from $3,400. The value-to-quality ratio is excellent — US-manufactured, 10-year parts warranty, 96% AFUE qualifying for the Enbridge $650 rebate, and two-stage output for better temperature consistency than single-stage. Net cost after the Enbridge rebate: approximately $2,750 for a 40,000 BTU two-stage Goodman fully installed. All other brands quoted with published pricing at the same estimate visit so you can compare.
Single-Stage vs Two-Stage vs Modulating Furnace — Ontario Guide
The output stage configuration affects comfort, noise, humidity control, and price. Here is the honest comparison Hawana gives at every estimate visit.
Single-Stage
- Lowest upfront cost
- Simplest controls — fewest components to fail
- Fires at full output even on mild days
- Short cycles in autumn — temperature swings
- Less effective humidity control
- Louder operation per cycle
- Best for: tight budgets, simple mechanical rooms
Two-Stage ⭐
- Hawana's recommendation for most London Ontario homes
- 65% output for mild weather — longer, quieter cycles
- 100% output in deep cold (minus 15°C to minus 20°C)
- More consistent temperature throughout home
- Better humidity control in shoulder seasons
- $200–$400 premium over single-stage
- Best for: most London Ontario homes with standard ductwork
Modulating
- Best comfort — output matches demand precisely
- Highest efficiency in mild weather
- Near-silent operation at low output
- Best humidity control available
- $600–$1,000 premium over single-stage
- More complex controls — more to service
- Best for: large homes, zoned systems, comfort-first budget
🚨 Cracked Heat Exchanger — Carbon Monoxide Risk. Do Not Ignore.
A cracked heat exchanger is the most serious safety issue in a residential gas furnace. The heat exchanger separates combustion gases from the air that circulates through your home. When it cracks — which happens through thermal stress over years of heating cycles — carbon monoxide and other combustion gases can enter the air supply.
Carbon monoxide is colourless, odourless, and extremely dangerous. It causes headaches, nausea, confusion, and at high concentrations, unconsciousness and death. Every London Ontario home with a gas furnace should have a working carbon monoxide detector on every floor.
If Hawana finds a cracked heat exchanger during a diagnostic or maintenance visit, the furnace is shut down for safety and the options are presented clearly: heat exchanger replacement ($800 to $1,500 on furnaces under 15 years old) or full furnace replacement (from $3,400). The decision is yours — the furnace does not run until it is safe.
Your Furnace Repair & Installation Specialist — London Ontario & Southwestern Ontario
Abdullah Ghzail — Lead HVAC Technician & Founder
Abdullah has repaired and installed gas furnaces across London Ontario and Southwestern Ontario since 2018 — emergency ignitor replacements at 2am in January when temperatures are minus 20°C outside, Goodman two-stage installations with Manual J load calculations confirming the correct BTU output for the specific home (not rule-of-thumb oversizing that creates short cycling and comfort problems), honest repair vs replace advice that tells a homeowner when a $200 flame sensor cleaning is genuinely the right answer instead of a $3,400 replacement, and Enbridge $650 rebate applications handled after every qualifying installation so the homeowner receives the cheque without any paperwork. TSSA certified for both natural gas and LP propane. BBB A+. 138 five-star Google reviews. No rental. No monthly subscription. 24/7 zero surcharge.
Furnace Reviews — London Ontario
138 five-star reviews — 11pm January ignitor repair, Goodman two-stage install with Enbridge rebate, flame sensor cleaning and maintenance plan. Read all ↗
"Furnace stopped working at 11pm on a Tuesday in January — temperature outside was minus 18. Called Hawana. No surcharge for 11pm. Technician arrived within 90 minutes. Diagnosed a failed hot surface ignitor in under 20 minutes, replaced it on the spot. Furnace running by 1am. $175 diagnostic applied to repair cost, total under $300. Technician also checked the heat exchanger and flame sensor while there. This is exactly what you need in January in London Ontario."
"New Goodman 96% AFUE two-stage installed October to replace our 19-year-old single-stage. Hawana had the price from $3,400 online — the only London HVAC company that published a number. Technician did a Manual J load calculation, confirmed existing ductwork was correctly sized, recommended two-stage over single-stage explaining the comfort difference. The Enbridge $650 rebate was handled entirely by Hawana — cheque arrived about 6 weeks later. No rental. Invoice matched the written quote exactly. The two-stage runs so much quieter and temperature is noticeably more even throughout the house."
"Furnace starting and immediately shutting down every few minutes. Called Hawana. Technician came same day, diagnosed a dirty flame sensor in under 15 minutes. Cleaned it on the spot — furnace ran perfectly. $175 diagnostic, total around $175. He explained that flame sensors accumulate oxidation from combustion and should be cleaned annually — ours had not been cleaned in 8 years. Enrolled in Hawana's annual maintenance plan at $149 per year so this does not happen again."
Furnace Service — Southwestern Ontario
Same published pricing across the entire service area. No distance surcharge. 24/7 zero after-hours surcharge everywhere.
Furnace FAQ — London Ontario 2026
Every question London Ontario homeowners ask about furnace repair cost, installation price, AFUE, Enbridge rebate, heat exchanger cracks, brands, emergency service, and lifespan.
Furnace Not Working in London Ontario?
$175 diagnostic, same-day emergency, 24/7 zero surcharge. Gas furnace installation from $3,400. Enbridge $650 rebate handled. Goodman, Lennox, Carrier, Napoleon. Manual J every install. No rental. TSSA certified. BBB A+. 138 five-star reviews.
More Heating & HVAC Services — London Ontario
🔥 Furnace Installation — Full Guide
Gas from $3,400. Propane from $3,900. Manual J, Enbridge $650, brands compared.
🔧 Furnace Repair & Maintenance
$175 diagnostic. Annual tune-up $149/yr. All 8 common failures covered.
🌡️ Heat Pumps London Ontario
OHRSP $7,500 + Greener Homes $5,000. Cold-climate rated. From $3,700.
❄️ Air Conditioning London Ontario
Central AC from $3,500. Combo furnace + AC from $6,500. Manual J every install.
📋 Annual Maintenance Plans
$149/yr Basic. $249/yr Premium. Furnace + AC covered. Prevents emergency failures.
💇 Gas Line Services
TSSA certified. Gas line installation, upgrades, pressure testing, appliance connections.