Top 5 HVAC Companies
in Markham
We compared 5 HVAC Companies serving Markham, Ontario using publicly available business information, including customer reputation, local presence and documented services. Across the businesses featured here, documented specialties include Heat pump installation, Air conditioner repair and installation, and HVAC installation.
≈ Markham’s featured hvac companies have a FiveBest Score in line with the Ontario benchmark.
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High Efficiency Cooling & Heating Inc. fits the HVAC category through documented installation, repair and preventive-maintenance work for heating, cooling and ventilation systems. Its published materials cover residential homes, condominium suites and commercial equipment from its Markham office.
HVAC installation · HVAC repair · Preventive maintenance
ICare Home Comfort operates from Denison Street in Markham and documents HVAC installation and repair for furnaces, air conditioners and heat pumps. Its offering also includes ductless mini-splits, ventilation and indoor-air products, making it relevant for home heating, cooling and system-upgrade projects.
Furnace installation and repair · Air conditioner installation and repair · Heat pump installation
Unionville Heating & Air Conditioning provides residential HVAC installation, repair and maintenance for Markham and nearby communities. Its documented work includes furnace and air-conditioner service or replacement, custom ductwork, and indoor-air-quality equipment. The company also states that emergency service is available and offers 24/7 customer support access.
Furnace repair and replacement · Air conditioner repair and installation · Annual HVAC maintenance
Based at Don Park Road, Constant Home Comfort provides Markham HVAC work covering furnace and air-conditioner installation, service and replacement, plus heat-pump installation. Its official Markham page documents 24/7 emergency service, while its ductless mini-split systems are positioned for additions and rooms without ductwork.
Furnace installation, replacement and service · Air conditioner installation, repair and maintenance · Heat pump installation
From furnace and heat pump repair and installation to air-conditioning service, Eco Star Home Services Co. operates from its Markham headquarters. The company documents 24/7 emergency HVAC repairs, maintenance plans and ductless mini-split systems for equipment breakdowns, seasonal upgrades and ongoing heating and cooling upkeep.
Furnace repair and installation · Heat pump repair and installation · Air conditioner repair and installation
Markham hvac companies are in line with the Ontario benchmark
Featured hvac companies in Markham have a median FiveBest Score™ of 86/100, compared with 86/100 for featured hvac companies across Ontario.
Among nearby FiveBest markets, hvac companies in Vaughan (89/100) and hvac companies in Toronto (91/100) score higher, while Richmond Hill (85/100) scores below Markham.
Comparison based on profiles currently featured by FiveBest in this category with an available FiveBest Score™.
How we researched HVAC Companies in Markham
FiveBest reviews publicly available information for HVAC Companies serving Markham.
- Google rating and review history
- Documented services
- Years in business when available
- Markham and surrounding service coverage
- Business website and online presence
- Independent reputation signals when available
Research last updated: September 2026
Typical HVAC Service Price Ranges
Price ranges are based on typical industry averages. Actual costs may vary according to equipment type, system capacity, installation complexity, property characteristics, labour, permits and local market conditions.
- Service call $120–$250
- Furnace repair $250–$1,200
- AC repair $250–$1,500
- Heat pump install $4,000–$9,500+
- Furnace replacement $4,000–$8,500+
Common Services
- Furnace repair and installation in Markham
- Air conditioner repair and installation in Markham
- Heat pump installation and repair in Markham
- Boiler repair and replacement in Markham
- Ductless mini-split systems in Markham
- HVAC maintenance and tune-ups in Markham
How to Choose an HVAC company in Markham
Compare HVAC contractors in Markham for furnace and boiler repair, air conditioner installation, heat pump service, ductless mini-split systems, ventilation, thermostats, indoor air quality, seasonal maintenance and emergency heating or cooling. FiveBest helps homeowners and businesses compare selected local HVAC companies in one place.
Compare selected HVAC companies in Markham for furnace repair, air conditioning, heat pumps, boilers, ductless systems, maintenance and emergency heating or cooling service.
For repairs, ask what testing supports the diagnosis before replacing major components or equipment.
For replacement, ask how heating and cooling capacity is determined rather than automatically matching the old unit.
Confirm equipment, labour, controls, electrical work, drains, line sets, disposal and commissioning.
Confirm the contractor and technicians meet applicable requirements for HVAC, gas, refrigerant or electrical work.
Ask about permits, inspections and documentation needed for any available efficiency rebates or incentives.
Compare parts, compressor or heat-exchanger, labour warranties and maintenance requirements.
What Affects HVAC Costs
- Type of system
- Heating and cooling capacity
- Efficiency rating
- Ductwork condition
- Electrical or gas upgrades
- Refrigerant and line-set requirements
- Controls and thermostat
- Installation complexity
- Permits and commissioning
- Warranty and maintenance plan
Questions to Ask an HVAC Contractor
- How did you determine the required system capacity?
- What exact equipment model and efficiency rating are included?
- Does my ductwork need changes?
- Are electrical, gas or drainage changes included?
- What permits or inspections apply?
- Is commissioning and system testing included?
- What manufacturer and labour warranties apply?
- What maintenance is required to keep warranty coverage?
Frequently Asked Questions
HVAC costs in Markham depend on the equipment, system capacity, diagnosis, required parts, labour, accessibility and whether the work is an emergency repair or a complete installation. Request a written estimate that identifies equipment and warranty details.
Repair may make sense for a newer system with a limited problem. Replacement may be more practical when equipment is old, inefficient, unreliable, expensive to repair or unable to heat or cool the property properly.
Heat pumps can provide efficient heating and cooling, but the appropriate model and backup-heating strategy depend on the local climate, home insulation, electrical capacity and existing HVAC system.
Many contractors recommend seasonal inspection and maintenance, typically before the main heating or cooling season. Follow the manufacturer’s requirements to protect performance and warranty coverage.
Many companies provide emergency service for loss of heat, system failure, unusual smells, electrical issues or other urgent heating and cooling problems. Confirm hours, response area and after-hours fees.
Compare applicable licences, insurance, equipment brands, system-sizing methods, written estimates, efficiency ratings, labour and manufacturer warranties, maintenance plans, financing and recent local reviews.