Fall Service Special – $120
Due to the mail interruption please do not wait to get your reminder before you call in for your fall service.
30+
Years of Heating, Cooling and Air Quality Experience
Furnaces
Our high efficiency furnaces will make sure you enjoy years of trouble-free use thanks to our professional, no-mess installation.
Air Conditioning
We don’t just supply and install air conditioners; we work with you to find an efficient and affordable match for your home and your budget.
Humidifiers
A humidifier can relieve cracked skin, itchy eyes and sore throats, returning your home to the comfortable place it ought to be!
Air Cleaners
An air cleaner is a great way to deal with allergies and make your home a more enjoyable place to live.
Gas Fireplaces
Gas fireplaces are more exciting and affordable option, you can have great looking fireplace with just a click of switch.
Hot Water Heaters
We can install conventional or tankless hot water heaters and can repair most makes and models.
Unionville heating & air conditioning
Dependable installation, maintenance and repairs
A family owned and operated business since 1983, Unionville Heating & Air Conditioning helps homeowners throughout Unionville, North Scarborough and the surrounding areas stay comfortable year round. Our technicians install, maintain and repair all major brands of heating, air conditioning and air quality systems—at prices that are hard to beat!
Fully licensed and insured
Our technicians—fully licensed and insured—bringing over 30 years of experience to each and every installation, repair and maintenance call. What’s more, we take care around your property and take pride in our work. Give us a try; we know we will provide the first-rate service you are looking for. Like our slogan says “Craftsmanship, A Fine Tradition”.
Service that works!
Whether you’re looking for a new high-efficiency furnace or need fast airconditioner repair, you can count on Unionville HVAC for expert service.
Special Offers – Make sure to remind our booking team on call!
5% Senior discount on fall or spring Service
*Cannot be combined with any other offers.
Refer your friends for exciting offers!
A referral program for our existing customers. If a major piece of equipment is purchased from the referral, you get $50 or a free service call.
Schedule a free estimate
Get in touch with us for a FREE no obligation estimate on new equipment. Our sales people are also our service people and will provide quotes for home comfort systems that will meet your needs and budget.
Free estimates apply to equipment replacement only. Diagnostic fees apply for repairs, in depth / multiple investigations or complex system designs
We work with trusted brands
Authorized dealers and certified installers for premium HVAC equipment
Rheem
High-efficiency heating & cooling systems
Aprilaire
Whole-Home
Humidifiers,Dehumidifiers & Air Purifiers
Goodman
Affordable, Durable HVAC Units
Navien
Energy-Efficient Tankless Water Heaters & Boilers
Honeywell
Thermostats & Smart Home Comfort Controls
Kingsman Fireplaces
Custom Gas Fireplaces & Home Heating Solutions
Client testimonials
Don’t just take our word for it — see what homeowners across Unionville and the GTA say about our professional furnace, AC, and fireplace installation and service.
To inform you of one of my most pleasant tasks of home maintenance, the representatives of Unionville Heating and Air Conditioning just installed for me and my family a new Air Conditioning unit. From the first rep, to the three installers we were treated with professionalism, courtesy, total honesty, and great, great workmanship! To create a “non-descript” item, to a thing of beauty, takes craftsmanship and loyalty! Thank you and your employees for a job well done!
Continued success to you and your employees! With total satisfaction!
G.R
Unionville
Simply stated, this company is great. We had a no-heat situation. The technician (Mitchell) that showed up soon after our phone call diagnosed the problem within minutes. He’s good, really good. Unfortunately, a repair was unrealistic so a new furnace was in order. Their schedule was jam packed but they rearranged things to install a new furnace two days later. They even left us with two space heaters to tide us over until the new furnace was operational. The final result is a clean, finished look and there was no garbage left behind. Mitchell and the owner took the time to introduce themselves and made sure we were satisfied. Great experience (if one can have a great experience with a furnace install!).
Carl Lenarcic
Great service! They resolved my fireplace issue and even sourced the pilot assembly the same day. The technician was on time, knowledgeable, and very friendly. Highly recommend!
Shreeya Malhotra
Markham Heating offered reliable and timely service to our leaking furnace. Mitch, the technician who attended to the furnace immediately identified the concern and was able to secure the parts and arrange the repair within 24 hours. I appreciated his consideration to remove his shoes in my house and they arrived within the agreed timeframe. Mitch provided a detailed description of the repair, the costs involved and did not try to upsell any further services. They cleaned up the leak and disposed of the trash. We definitely recommend this company for furnace maintenance and repair!
Jean Chow
Professional Affiliation:
Ready to stay comfortable year-round?
Contact Unionville’s trusted HVAC experts for fast, reliable heating, cooling, and indoor air quality service
Available 7 days
Fast local hvac service when you need it most
Licensed & Insured
Certified Technicians You Can Trust
Over 30 Years Serving Unionville Homes
Trusted for Heating, Cooling & Air Quality Expertise
Unionville Heating & Air Conditioning Experts You Can Trust
When it comes to comfort, nothing matters more than keeping your home warm in winter and cool in summer. In Unionville — where historic charm meets modern living — homeowners expect comfort systems that perform flawlessly in every season. Markham Heating & Air Conditioning is proud to serve the Unionville community with dependable, professional, and high-quality HVAC services designed for our Ontario climate.
With decades of experience, licensed technicians, and a commitment to energy-efficient comfort, we provide heating, cooling, and air quality solutions that keep Unionville families comfortable all year round.
Your Local HVAC Partner in Unionville
Unionville is more than just a picturesque Main Street and heritage homes — it’s a vibrant, growing community that blends tradition with innovation. Whether you live in an older character home, a newer subdivision, or a modern condo, every property has its own heating and cooling needs.
That’s where we come in.
Markham Heating & Air Conditioning understands the challenges of Unionville homes — older duct systems, insulation concerns, humidity control, and the need for quiet, efficient comfort systems. We take pride in delivering custom HVAC solutions that perfectly suit your home’s design and your family’s comfort preferences.
Comprehensive HVAC Services in Unionville
We offer a full range of heating, cooling, and indoor air quality services, ensuring your entire system is covered from installation to long-term care.
1. Furnace Installation & Replacement
When temperatures drop below freezing, you need a furnace that’s powerful, efficient, and reliable. Our experts specialize in installing high-efficiency gas furnaces from leading manufacturers, ensuring quiet operation and energy savings.
We’ll assess your home’s size, insulation, and duct layout to recommend the right system — not just any furnace, but the one that keeps your Unionville home warm for years to come.
2. Furnace Repair & Maintenance
If your furnace starts making strange noises, blowing cool air, or cycling too often, don’t wait for a full breakdown. Our Unionville furnace repair technicians are trained to diagnose and fix problems quickly, restoring comfort and preventing costly future repairs.
Regular maintenance, including annual tune-ups, helps extend the lifespan of your furnace and ensures optimal performance when you need it most.
3. Air Conditioning Installation & Service
Unionville summers can be hot and humid, and an efficient air conditioning system makes all the difference. We install central air conditioners, ductless mini-splits, and heat pumps — all designed for energy savings and powerful cooling.
We also provide routine AC maintenance, ensuring your unit runs quietly and efficiently all summer long.
4. Emergency HVAC Repairs
Comfort emergencies don’t wait for business hours — and neither do we. Our team provides 24/7 emergency HVAC repairs in Unionville, so you’re never left without heating or cooling when you need it most.
We respond quickly, carry a full range of replacement parts, and ensure your system is back up and running safely in no time.
5. Indoor Air Quality Solutions
Today’s Unionville homes are built to be energy-tight, which is great for efficiency but not always for air quality. Dust, allergens, and humidity imbalances can affect your health and comfort.
We offer advanced air purification systems, whole-home humidifiers, and ventilation solutions that keep your indoor environment fresh, balanced, and healthy year-round.
Why Unionville Homeowners Choose Markham Heating & Air Conditioning
Unionville homeowners have trusted our name for generations because we combine expert craftsmanship, transparent pricing, and a local touch.
Here’s what sets us apart:
✔ Local Expertise
We know Unionville — its heritage homes, modern subdivisions, and everything in between. We understand how local weather patterns, construction styles, and building codes affect HVAC performance.
That means we don’t offer one-size-fits-all solutions; we tailor every installation and service call to the unique needs of your property.
✔ Licensed & Insured Technicians
Every technician is fully certified, insured, and trained to work with the latest heating and cooling technologies. We’re committed to safety, efficiency, and precision workmanship on every job.
✔ Honest, Transparent Service
There are no hidden fees, upselling, or surprise charges. Before any work begins, we provide a clear, written estimate and explain your options — so you stay in control of your budget.
✔ Energy Efficiency & Savings
Unionville homeowners value sustainability and energy efficiency. Our team helps you choose ENERGY STAR® rated systems, access government rebates, and design solutions that lower monthly utility costs without sacrificing comfort.
✔ Long-Term Reliability
Our goal isn’t just a single repair — it’s to be your trusted HVAC partner for life. We back our work with manufacturer warranties and satisfaction guarantees, giving you peace of mind for every season.
Tailored Comfort for Every Unionville Home
Whether you live near the historic core of Main Street Unionville, in the Toogood Pond neighbourhood, or in a newer development near Kennedy Road, your home’s HVAC needs are unique.
Older homes may require upgraded ductwork and insulation to accommodate high-efficiency systems, while newer properties might benefit from smart thermostats and zoning technology.
At Markham Heating & Air Conditioning, we take a personalized approach. We assess your property, discuss your comfort preferences, and design a system that balances performance, efficiency, and budget.
Preventive Maintenance for Year-Round Reliability
Regular HVAC maintenance isn’t just a recommendation — it’s the key to system longevity and efficiency.
Our Unionville HVAC maintenance plans include seasonal inspections, filter changes, system cleaning, and performance testing. These proactive visits help you avoid unexpected breakdowns and keep your home comfortable all year.
A well-maintained system means:
- Lower energy bills
- Fewer emergency repairs
- Consistent indoor comfort
- Longer equipment lifespan
Our maintenance clients also enjoy priority scheduling and discounts on repairs, making it easy and affordable to protect your investment.
Energy Efficiency and Green Comfort Solutions
Unionville homeowners are increasingly conscious of their carbon footprint. That’s why we specialize in energy-efficient HVAC systems that deliver both comfort and sustainability.
We can help you upgrade to:
- High-efficiency furnaces and air conditioners
- Heat pumps and hybrid systems
- Smart thermostats and zoning controls
- Properly sealed and balanced duct systems
Not only will these upgrades reduce your environmental impact, but they’ll also lower monthly operating costs and qualify for available rebates through Ontario energy programs.
Commercial HVAC Services in Unionville
We don’t just serve homes — we also help local Unionville businesses maintain comfortable, productive indoor environments.
From office buildings and restaurants to retail spaces and clinics, we provide commercial HVAC installation, maintenance, and repair services. Our commercial clients value our reliability, efficiency, and fast response times — so their operations never skip a beat.
Trusted in Unionville — Backed by Experience
As part of the Markham community for decades, we’ve proudly supported homeowners throughout Unionville and the surrounding areas. Our reputation is built on trust, professionalism, and results.
From the first phone call to the final inspection, we treat every home as if it were our own. Our friendly technicians arrive on time, respect your space, and deliver work that meets the highest standards of quality.
When to Call for HVAC Service
If you notice any of the following, it’s time to contact our Unionville HVAC team:
- Uneven temperatures between rooms
- Weak airflow or warm air from vents
- Rising energy bills
- Unusual noises or odors
- Frequent cycling or poor humidity control
Even minor issues can develop into major repairs if left unaddressed. Our technicians will quickly diagnose the problem and restore your comfort.
Proudly Serving Unionville and Beyond
We’re proud to serve Unionville and nearby communities throughout Markham and York Region, including:
- Angus Glen
- Berczy Village
- Greensborough
- Raymerville
- Wismer Commons
Wherever you are in Unionville, you can count on fast, friendly, and professional service backed by a company that truly cares about your comfort.
Your Comfort, Our Commitment
At Markham Heating & Air Conditioning, we believe your home should always feel like a haven — cool in the summer, warm in the winter, and fresh every day in between. Our mission is simple: to provide honest, reliable, and expert HVAC service that Unionville homeowners can depend on.
When you work with us, you’re not just getting a technician — you’re getting a partner in home comfort.
Get in Touch Today
Ready to experience the difference of a trusted local HVAC company? Whether you need a new furnace, an air conditioner tune-up, or an urgent repair, our Unionville team is here to help.