Canada Online

Top 10 Best HVAC contractors in Markham, ON

Updated July 12, 2026

Keeping your home comfortable year-round starts with a reliable HVAC contractor. Our 2026 ranking highlights the 10 best heating and cooling companies in Markham, ON, chosen for verified reviews, service consistency, and local reputation. Each listing includes up-to-date contact information, operating hours, and company details — helping you quickly find licensed professionals for installation, repair, or emergency service. Whether you need furnace maintenance before winter or an AC tune-up in summer, trusted experts are ready to serve your neighborhood.

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Frequently Asked Questions — HVAC contractors in Markham, ON

How much does HVAC service cost in Markham, ON?
Routine maintenance visits usually cost $150–$300, depending on the size of your system and the type of service. Full installations or emergency repairs can range from $3,000 to $8,000, depending on the equipment and labor required.

Do HVAC contractors offer emergency repair services?
Yes, many local HVAC companies provide 24/7 emergency heating and cooling repairs. Listings marked with "24/7 Service" are available after hours to handle urgent issues like furnace failures or AC breakdowns.

Are HVAC technicians certified and insured?
All reputable HVAC contractors across Ontario employ licensed and certified technicians, often holding Red Seal or TSSA accreditation. Working with certified professionals ensures compliance with provincial safety and efficiency standards.

How was this Top 10 list created?
Our ranking is based on a 30-point evaluation system developed by the editorial team at Canada Online. Each business is verified for NAP accuracy, review quality, service reputation, and business completeness (photos, website, operating hours). Additional factors include responsiveness, consistency, and complaint history. Rankings are manually reviewed and updated quarterly to reflect current customer satisfaction and service quality.

Can I add my HVAC company to this list?
Yes — HVAC contractors operating in Markham, ON can claim or add their business through our "Add Company" page. Verified listings with accurate information and strong reviews may be featured in future updates of this ranking.