Stay cool all summer long with Durham Region’s most trusted HVAC team. From Oshawa to Clarington, we serve every community in Durham Region with professional air conditioner services you can count on.
Complete central air installation for Durham Region homes, from single-family houses to townhomes. We size your system correctly and install to TSSA standards with full permits and warranties.
Fast air conditioner repair throughout Durham Region. From refrigerant leaks to compressor failures, our TSSA technicians diagnose and fix all makes and models, often the same day you call.
Upgrade to a more efficient air conditioner with full replacement service. Perfect for Durham Region homeowners dealing with aging systems that break down frequently or struggle to keep up with demand.
Keep your air conditioner running efficiently with annual maintenance service. We clean coils, check refrigerant levels, and catch small problems before they become expensive repairs during hot Durham Region summers.
Lower your energy bills with a high-efficiency air conditioner upgrade. Modern units with SEER ratings above 16 can cut cooling costs significantly for Durham Region homeowners, especially in larger homes.
When your AC breaks down on the hottest day of the year, we’re ready to help. Emergency air conditioner service throughout Durham Region with same-day response when possible to get you cool again fast.
Durham Region homeowners choose Cassar for air conditioner service because we deliver quality work at fair prices. Every job is backed by our guarantee and completed by licensed TSSA technicians who take pride in their craft.
Most central air conditioners in Ontario last between 12-18 years with proper maintenance. However, Durham Region’s climate can affect lifespan — our hot, humid summers put extra strain on cooling systems, while temperature swings between seasons cause expansion and contraction that can stress components over time.
Signs your air conditioner is reaching end of life include frequent repairs, rising energy bills, uneven cooling, and struggling to maintain comfortable temperatures during peak summer heat. Units older than 15 years often use R-22 refrigerant, which is being phased out and becoming expensive to service.
The good news is that modern air conditioners are far more efficient than older models. Replacing a 10+ year old system can cut your cooling costs by 20-40% while providing better comfort and reliability.
New central air conditioner installation in Durham Region typically ranges from $4,500-$8,500 for a complete system, depending on home size, efficiency level, and installation complexity. Higher efficiency units (SEER 16+) cost more upfront but provide significant long-term savings on energy bills.
Air conditioner repairs usually range from $200-$800, with common issues like capacitor replacement ($250-$400), refrigerant recharge ($300-$600), and thermostat replacement ($200-$350). Major repairs like compressor replacement often cost $1,500-$2,500, at which point replacement becomes the better investment.
Remember that these are rough ranges — every situation is different. At Cassar, we work with homeowners across all budget ranges and offer financing options to make quality cooling affordable. The best way to know exactly what your job will cost is to get a free quote from David — no pressure, no obligation.
Durham Region’s diverse housing stock presents unique air conditioning challenges. Older homes in established neighbourhoods like Oshawa’s Kedron or Whitby’s Brooklin often lack existing ductwork, making ductless mini-splits an excellent option for adding cooling without major renovations.
Newer subdivisions in areas like Ajax’s Pickering Village or Clarington’s Bowmanville typically come pre-wired for central air, but may need system upgrades as families grow or finish basements. Two-story homes are particularly common in Durham Region and require careful system sizing to ensure even cooling between floors.
Durham Region’s summer heat makes air conditioner problems obvious quickly. Watch for these warning signs: system running constantly but house not cooling, warm air blowing from vents, unusual noises like grinding or squealing, strange smells, or ice buildup on the outdoor unit or indoor coils.
Rising energy bills without increased usage often indicate efficiency problems. Short cycling (turning on and off frequently) typically means the system is oversized, has refrigerant issues, or has a failing component. Don’t ignore these signs — small problems become expensive repairs when the system works harder during hot weather.
Annual maintenance catches most issues before they become emergencies. We recommend scheduling service in late spring before the cooling season begins, ensuring your system is ready for Durham Region’s demanding summer weather.
Ontario’s hot, humid summers mean your air conditioner works hard from June through September. Simple steps can reduce strain and lower energy bills: keep curtains closed during peak sun hours, use ceiling fans to circulate cooled air, and set your thermostat to 24°C when home (raising it just 2 degrees can save 10-20% on cooling costs).
Change your air filter monthly during cooling season — Durham Region’s tree pollen and summer dust clog filters quickly. Keep the outdoor unit clear of debris, leaves, and vegetation. A dirty condenser coil can reduce efficiency by 30% and lead to expensive compressor damage.
Consider a programmable or smart thermostat to automatically adjust temperatures when you’re away. With Durham Region’s variable work schedules and cottage country proximity, many families can save significantly by not cooling empty homes to comfort levels.
Electrical safety is critical with air conditioning systems. Never attempt electrical repairs yourself — air conditioners draw significant power and improper work can cause fires, electrocution, or expensive damage. Always ensure your system is properly grounded and that breakers are appropriately sized for the unit.
Refrigerant safety is equally important. Modern refrigerants are environmentally regulated and require certified technicians for handling. DIY refrigerant work is illegal in Ontario and dangerous — refrigerant leaks can cause frostbite, and improper charging can destroy your compressor.
Carbon monoxide concerns apply when air conditioners share exhaust areas with gas appliances. Ensure proper ventilation and never block exhaust vents. Annual professional maintenance includes safety checks that protect your family beyond just system performance.
Before calling for service, these quick checks might get your air conditioner running again.
Make sure it’s set to Cool and the temperature is set below current room temperature. Check the batteries too — a weak battery causes erratic thermostat behaviour.
Your AC has a breaker in the main panel and an exterior disconnect box next to the outdoor unit. Check both are on.
A clogged filter blocks airflow and causes the evaporator coil to ice up, completely stopping cooling. Replace the filter and let the unit thaw for an hour before restarting.
The condenser unit outside needs clear airflow. Remove any debris, overgrowth, or objects within 60cm of the unit. Don’t hose it down while running.
Closed vents create pressure imbalances that reduce cooling and can damage the system. Make sure every supply vent in the home is open.
If none of the above restore your air conditioner, it’s time for a licensed technician. David and his crew serve all of Durham Region and respond fast.
“David and his team installed our new air conditioner last summer and we couldn’t be happier. Professional work, fair pricing, and they kept our Ajax home cool all season long. Highly recommend for anyone in Durham Region needing AC service.”
“Called Cassar when our AC stopped working during the heat wave. David came out same day, diagnosed the problem quickly, and had us cool again within hours. Honest pricing and quality work throughout Durham Region.”
“Best HVAC service in Durham Region. David replaced our old AC with a high-efficiency unit that cut our energy bills significantly. Professional installation and great follow-up service. These guys know air conditioners inside and out.”
Professional air conditioner installation, repair and maintenance throughout Durham Region and surrounding communities.
Same-day service available. TSSA certified. Honest pricing. Call or book online.
