Serving Oshawa homeowners and businesses with expert furnace service since 2015. David Cassar and his team provide same-day furnace repair and professional installation throughout Durham Region.
Complete furnace installation for Oshawa homes, from older neighbourhoods like Lakeview to new builds in Windfields. We install high-efficiency gas and electric furnaces with proper sizing calculations and full warranty coverage.
Fast, reliable furnace repair for all makes and models throughout Oshawa. Same-day service available for no heat calls. We stock common parts and provide honest diagnostics with upfront pricing for every repair.
When repair isn’t economical, we help Oshawa homeowners choose the right replacement furnace. Free in-home consultations, proper load calculations, and complete removal of old equipment with installation of your new high-efficiency system.
Comprehensive furnace maintenance to keep your system running efficiently all winter long. Multi-point inspection, cleaning, filter replacement, and safety checks ensure peak performance and help prevent unexpected breakdowns.
Upgrade to a 90%+ AFUE furnace and qualify for energy rebates. Modern high-efficiency furnaces reduce heating bills, provide more consistent comfort, and often include advanced features like variable-speed blowers and modulating burners.
No heat in the middle of an Oshawa winter? We provide 24/7 emergency furnace repair to get your heating restored quickly and safely. Priority scheduling for urgent calls with transparent emergency service rates.
For nearly a decade, Oshawa homeowners have trusted Cassar Heating & Air Conditioning for honest, professional furnace service. We understand the unique heating needs of homes throughout the Durham Region and always put your family’s comfort first.
In Ontario’s climate, a well-maintained furnace typically lasts 15-20 years, though this varies significantly based on usage, maintenance, and quality of installation. High-efficiency furnaces installed after 2010 often include better components and more sophisticated controls that can extend their lifespan with proper care.
The key to maximizing furnace life in Ontario is consistent annual maintenance. Our harsh winters put significant stress on heating systems, making regular tune-ups essential. Signs your furnace may be nearing replacement include frequent repairs, rising energy bills, uneven heating, and age over 15 years combined with declining efficiency.
If your furnace is approaching 12-15 years old, it’s wise to start planning for replacement rather than waiting for complete failure during the coldest part of winter when emergency installation costs more and equipment availability may be limited.
Complete furnace installation in Oshawa typically ranges from $3,500-$8,000 depending on the unit size, efficiency rating, and complexity of installation. Basic mid-efficiency units start around $3,500-$4,500 installed, while high-efficiency systems with advanced features can reach $6,000-$8,000 for larger homes or complex installations.
Repair costs are generally much more affordable, with most common fixes ranging from $200-$600. Simple repairs like thermostat replacement, filter changes, or minor component fixes usually cost $150-$350, while more significant repairs involving heat exchangers, blower motors, or control boards can run $400-$800.
Remember, Cassar works with homeowners across all budget ranges and offers flexible financing options to make furnace replacement affordable. Every job gets a free upfront quote with no obligation, so you know exactly what to expect before any work begins. The best way to know exactly what your job will cost is to get a free quote from David — no pressure, no obligation.
Oshawa’s diverse housing stock presents unique furnace challenges. Older homes in established neighbourhoods like Lakeview and downtown often have aging ductwork and may require furnace downsizing due to improved insulation upgrades. These homes frequently benefit from high-efficiency furnaces that provide more consistent heating with less energy consumption.
Newer subdivisions in areas like Windfields and north Oshawa typically have modern ductwork but may have been built with minimal furnace capacity to meet code requirements. Homeowners in these areas often find upgrading to a variable-speed or two-stage furnace significantly improves comfort by providing more consistent temperatures and better humidity control.
Oshawa’s proximity to Lake Ontario creates unique humidity challenges that can affect furnace performance. Proper sizing and equipment selection helps manage both heating and humidity for optimal indoor air quality throughout the heating season.
Several warning signs indicate your Oshawa furnace needs professional attention. Unusual noises like banging, squealing, or rattling often signal mechanical problems that should be addressed quickly to prevent more expensive damage. If your furnace is cycling on and off frequently, struggling to maintain temperature, or producing weak airflow, it’s time for a diagnostic.
Rising energy bills without increased usage can indicate declining efficiency, while yellow or flickering burner flames (instead of blue) suggest combustion problems requiring immediate attention. Any smell of gas, burning, or musty odours warrants shutting off the system and calling for service immediately.
Uneven heating throughout your home, excessive dust, or frequent filter clogging can indicate ductwork issues or improper system sizing. During Oshawa’s cold winters, don’t ignore these signs — early intervention usually costs far less than emergency repairs or complete system failure.
Durham Region’s variable winter weather — from mild periods to extreme cold snaps — requires furnace optimization strategies. Installing a programmable or smart thermostat helps manage energy costs during milder periods while ensuring comfort during temperature extremes. Set temperatures back 7-10 degrees when away or sleeping to reduce energy consumption without affecting comfort.
During extreme cold periods common in our area, avoid dramatic thermostat adjustments that can strain your furnace. Instead, maintain consistent temperatures and ensure all vents remain unblocked. Check and replace filters monthly during heavy-use periods, as our region’s mix of urban and rural areas can create higher dust loads.
Consider upgrading to a variable-speed furnace if you experience comfort issues. These systems adjust output to match demand, providing better temperature control and improved efficiency during the shoulder seasons typical in Durham Region’s climate.
Ontario homeowners should prioritize annual furnace safety inspections, especially for units over 10 years old. Carbon monoxide risks increase with furnace age and improper maintenance. Install CO detectors on every level of your home and test them monthly — this simple step can prevent tragic consequences from furnace malfunctions.
High-efficiency furnaces require specific maintenance attention to condensate drains and venting systems. These systems produce moisture that must drain properly, and plastic vent pipes can become blocked by ice during extreme cold periods. Professional maintenance ensures these critical safety systems function properly year-round.
Energy efficiency improvements like sealing ductwork, upgrading insulation, and proper furnace sizing can reduce heating costs by 20-30%. However, these improvements should complement, not replace, regular professional maintenance to ensure safe, efficient operation throughout Ontario’s demanding heating season.
Before calling for service, these quick checks resolve many common furnace issues.
Make sure it’s set to Heat, the temperature is above room temperature, and the batteries are fresh. This resolves more calls than you’d expect.
Your furnace has a dedicated circuit breaker in your electrical panel and usually a wall switch nearby. Check both are on.
A clogged filter restricts airflow and can trigger a safety shutoff. If you can’t see light through it, replace it before calling.
High-efficiency furnaces have plastic pipes exiting near the foundation. Snow or ice blocking these causes an automatic shutoff — clear them and restart.
Many furnaces have a safety switch that cuts power if the access panel isn’t fully closed. Make sure it’s secured properly.
If none of the above restore your furnace, it’s time for a licensed technician. David and his crew serve all of Durham Region and respond fast.
“David replaced our old furnace in our Lakeview home and the difference is incredible. Much more consistent heat throughout the house and our gas bills dropped noticeably. Professional installation and great follow-up service.”
“Called Cassar when our furnace died during that cold snap in January. David came out same day and had us back up and running quickly. Fair pricing and honest advice — highly recommend for Oshawa furnace repair.”
“Excellent furnace maintenance service. David is thorough, explains everything clearly, and always leaves our basement cleaner than he found it. Been using Cassar for three years now and couldn’t be happier.”
Serving Durham Region communities with expert furnace installation, repair and maintenance.
Same-day service available. TSSA certified. Honest pricing. Call or book online.
