Same-day Markham AC service
AC Repair in Markham — Cool Comfort, Same-Day
When your air conditioner gives up in the middle of a Markham heat wave, you don't have time to wait. Ontario Air Services repairs central AC, ductless mini-split and heat pump cooling systems across Markham, Unionville, Cornell, Markville and the rest of the north GTA — usually the same day you call.
Why Markham picks us
Cool, fast and honest
Same-day Markham AC
Priority dispatch during heat waves.
Licensed & insured
Refrigerant-handling certified technicians.
Every AC system
Central, ductless, heat pump and window units.
Upfront pricing
Written quote before any repair starts.
Time to call us if
Common AC problems we fix daily across Markham
- AC blows warm air or barely cools
- Outdoor unit won't start or trips the breaker
- Loud rattling, buzzing or grinding noises
- Ice forming on refrigerant lines or coil
- Water pooling around the indoor unit
- Sudden spike in your hydro bill
- Musty or burning smell when AC runs
- Short-cycling — system turns on and off rapidly
- AC over 12 years old and underperforming
What's included
A full Markham AC repair visit
We diagnose the real cause — not just the symptom. Every visit starts with a full system check (refrigerant pressures, electrical, airflow, drainage) so you don't pay twice for the same problem.
- Full system diagnostic with refrigerant and electrical check
- Capacitor, contactor, fan motor and compressor service
- Refrigerant leak detection, repair and top-up (R-410A and others)
- Evaporator and condenser coil cleaning
- Condensate line clearing and drain repair
- Smart thermostat installation and Wi-Fi setup
Old AC?
Replace with a heat pump and earn rebates
A modern heat pump cools just as well as central AC and heats your home in winter — qualifying Markham homeowners can claim up to $7,500 cash back. See our heat pump installation in the north GTA page or the full Heat Pump Rebate Ontario breakdown.
See cooling servicesNorth GTA cooling
AC repair across every Markham neighbourhood
From the heritage homes of Old Unionville and the larger executive properties in Cathedraltown, to family streets in Markville, Cornell and Berczy Village, we've serviced every cooling setup Markham has. Newer Markham builds frequently use multi-zone ductless systems and we work on all of them, while older homes with retrofitted ductwork get extra attention to airflow balance — often the real reason a system seems "weak" rather than the AC itself.
Outside Markham we cover Richmond Hill, Vaughan, Aurora, Newmarket and Scarborough with the same priority response. Need related help? Read about our AC repair in Toronto, browse all cooling services, or check heat pump repair if your system handles both heating and cooling.
FAQ
AC repair in Markham — common questions
How fast can you repair my AC in Markham?
During heat waves we keep priority slots open and most Markham AC repair calls are completed the same day. Our trucks are stocked with the common parts — capacitors, contactors, fan motors, refrigerant — so we can usually finish the job in one visit across Unionville, Cornell, Markville, Cathedraltown and Berczy Village.
How much does AC repair cost in Markham?
Typical Markham AC repairs run from $150 for a simple capacitor swap up to $900+ for a compressor or evaporator coil issue. We always quote in writing before starting work, and the diagnostic charge is rolled into the repair if you proceed.
Do you repair all AC brands and ductless mini-splits in Markham?
Yes. We service every major central AC brand sold in the GTA — Lennox, Carrier, Trane, Goodman, Rheem, Amana, York and more — plus all major ductless mini-split brands including Mitsubishi, Daikin, LG, Samsung and Gree. Many newer Markham builds use multi-zone ductless systems and we work on all of them.
My AC is leaking water — is it an emergency?
It can be. A clogged condensate drain is a same-day fix, but a frozen evaporator coil or refrigerant leak gets worse fast and can damage your compressor. Shut the system off and call us — we'll triage over the phone and dispatch quickly across Markham and the north GTA.
Should I repair or replace my AC in my Markham home?
If your unit is more than 12 years old, uses R-22 refrigerant, or the repair is over 50% of a new system's cost, replacement is usually the smarter long-term move — and a heat pump replacement may qualify for Ontario rebates up to $7,500. We'll quote both options honestly.
Which Markham and surrounding areas do you serve?
We provide AC repair across all of Markham — including Unionville, Cornell, Markville, Cathedraltown, Berczy Village, Milliken and Thornhill — and throughout the north GTA in Richmond Hill, Vaughan, Aurora, Newmarket and Scarborough.
Book a service call
Request AC repair in Markham
For same-day cooling emergencies during heat waves, calling is fastest. Otherwise drop your details below and we'll be in touch within the business day.
Service Areas
Ontario Air Services provides ac repair across Toronto and the GTA, including Vaughan, Markham, Richmond Hill, North York, Scarborough, Etobicoke, Mississauga, Brampton, Newmarket, Aurora, Oakville, and Burlington. No matter where you are located, our experienced technicians are ready to help.
- Toronto
- Vaughan
- Markham
- Richmond Hill
- North York
- Scarborough
- Etobicoke
- Mississauga
- Brampton
- Newmarket
- Aurora
- Oakville
- Burlington