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41 Years
experience
Emergency
services
Trusted HVAC Services in Stouffville, ON
Since 1985, Unionville Heating & Air Conditioning has been a trusted provider of residential HVAC solutions in Markham, Unionville, and Stouffville. Our team of certified technicians specializes in the installation, repair, and maintenance of heating, ventilation, and air conditioning systems, serving our community with over four decades of expertise. We prioritize customer satisfaction through reliable 24/7 emergency service, comprehensive annual maintenance programs, and a commitment to quality that has earned us 22 consecutive Readers Choice Awards for Best Business. Our locally owned and operated team ensures every service call addresses both immediate needs and long-term system efficiency.

By combining technical proficiency with personalized care, we deliver comfort solutions tailored to each homeowner's unique requirements. Our dedication to environmental responsibility is reflected in our recycling initiatives and energy-efficient product offerings. Through consistent community engagement and a focus on trust, we maintain a strong referral-based clientele. Our operational history, technical certifications, and customer-centric approach position us as a leader in residential HVAC services.
Services
Furnace Installation Air Conditioning Repair Thermostat Services Water Heater Maintenance Ductwork Solutions Indoor Air Quality Systems Gas Fireplace Service
Details
  • Year established: 1985
Highlights and features
  • 40+ years serving residential HVAC needs in Markham and Stouffville
  • 24/7 emergency service with prompt response times
  • Certified technicians with specialized HVAC expertise
  • Comprehensive annual maintenance programs
  • Recipient of Readers Choice Best Business award 22 consecutive years
What people say
Prompt appointment scheduling Knowledgeable technicians Professional crew Efficient service Reliable repairs
Services
Furnace Installation
We provide professional furnace installation services for residential properties. Our certified technicians specialize in selecting and installing energy-efficient heating systems that meet specific home requirements. The process includes proper sizing calculations, compatibility assessments, and expert implementation to ensure optimal performance and energy savings. Our installation services come with comprehensive warranties and post-installation support.
Air Conditioning Repair
Our emergency air conditioning repair services address cooling system malfunctions promptly. Technicians perform diagnostic evaluations, identify root causes, and implement effective repairs using manufacturer-approved parts. We handle all brands and models while maintaining system warranties. Our 24/7 availability ensures homeowners receive timely assistance during peak summer periods.
Thermostat Services
We offer thermostat installation, repair, and programming services for modern climate control systems. Our expertise covers both traditional and smart thermostat technologies. Services include proper calibration, integration with existing HVAC systems, and energy-efficient programming guidance to optimize comfort while reducing utility costs.
Water Heater Maintenance
Our water heater maintenance programs extend equipment lifespan and ensure safe operation. Services include tank flushing, anode rod inspection, pressure relief valve testing, and efficiency checks. We service both traditional tank and tankless systems, providing tailored maintenance protocols based on specific system requirements and usage patterns.
Ductwork Solutions
We design and install custom duct systems that optimize HVAC performance. Services include duct sizing calculations, material selection, and installation techniques that minimize energy loss. Our solutions address airflow imbalances and noise reduction while ensuring proper ventilation throughout residential properties.
People
John St Germain
President
With over 35 years in the HVAC industry, John leads our company's strategic direction while maintaining focus on customer satisfaction and operational excellence. He ensures our technical standards remain at the forefront of industry developments.
Dave Mainland
Chief Operations Manager
Dave oversees daily operations with 25+ years of HVAC management experience. He coordinates service delivery, maintains quality control, and ensures efficient resource allocation to meet customer needs promptly.
Eric Ranchigoda
Service Manager
As Service Manager, Eric supervises our technical team with 18 years of HVAC expertise. He focuses on service quality, technician training, and resolving complex system issues across residential installations.
Todd Nesbitt
Installation Technician
Todd brings 12 years of hands-on HVAC experience to our installation team. He specializes in system upgrades and new installations, maintaining precision while minimizing property disruption during projects.
Brenson Anistan
Service Technician
Brenson provides emergency repair services with an eight-year track record of resolving urgent HVAC issues. His focus on clear communication and thorough diagnostics has earned consistent customer satisfaction ratings.
Questions
What HVAC services do you offer?
We provide furnace and air conditioning installation, repair, and maintenance, along with thermostat services, water heater maintenance, ductwork solutions, and indoor air quality systems.
Do you offer 24/7 emergency service?
Yes, we provide 24/7 emergency HVAC service with technicians available year-round for urgent heating and cooling issues.
Which areas do you service?
We serve Stouffville, Markham, Unionville, Uxbridge, Pickering, Ajax, Whitby, Oshawa, Brooklin, and Aurora, with a focus on residential properties.
How often should HVAC systems be maintained?
We recommend annual maintenance for both heating and cooling systems to ensure optimal performance and extended equipment lifespan.
Are your technicians certified?
All our technicians are licensed, insured, and receive ongoing training to maintain expertise with current HVAC technologies.
Do you offer maintenance programs?
Our We Care annual service program includes scheduled maintenance visits and priority emergency service for furnace and air conditioning systems.