Thermostat Repair in Mississauga – Smart, Fast & Reliable Service

We provide fast, expert thermostat repair in Mississauga. From Nest to Honeywell, we fix all models. Same-day service for smart, manual, or furnace thermostats with fair pricing and guaranteed comfort.

Smart Temperature Control

Heating or Cooling Issues? We Fix Thermostats Across Mississauga

A faulty thermostat can mean cold nights, high bills, or random on-off cycling. We troubleshoot, repair, or install thermostats fast, right at your home or business. Whether it’s wiring, sensor faults, or power issues, we provide accurate diagnostics and HVAC thermostat repairs that restore comfort and system efficiency.

HVAC-GROUP

5.0

Based on 216 reviews

review us on

michael wickeler

16:50 06 Aug 25

HVAC GROUP punctual and very efficient at their job. Figured out the problem quickly and fixed the Air conditioner.

Response from the owner 17:07 06 Aug 25

Thank you, Michael, for the great review! We’re glad we could quickly diagnose and repair the rooftop unit at your Etobicoke property. From clearing the clogged drain tube and drain plate to cleaning the dirty coil fins and fixing the A/C relay connection — our goal is always fast, reliable service. We appreciate your trust in HVAC GROUP for your rooftop repair needs in Etobicoke. Don’t hesitate to reach out anytime you need us!

Erica Larry

22:45 01 Aug 25

Amazing service from Yuri! We will be using you again in the near future. Thank you again.

Response from the owner 23:14 01 Aug 25

Thank you so much for the 5-star review, Erica! We’re glad we could help with your A/C not cooling at your home on Ferndale Ave in Toronto. Our team at HVAC-GROUP quickly cleared the blocked furnace room drain and recharged your A/C unit with the proper level of R410A refrigerant for efficient cooling. Your comfort is our priority. If you ever need HVAC service in Toronto again, we’re just a call away!

Max Peters

15:47 31 Jul 25

Yuri and team quickly diagnosed my A/C issue and had the system back and running, with a very quick response time. Would recommend to anyone.

Response from the owner 16:19 31 Jul 25

Thank you Max so much for your kind words and 5-star review! We’re glad we could help get your AC back up and running quickly. Replacing the failed start/run capacitor was a simple fix, and we’re always happy to provide fast, reliable air conditioning repair service in the Etobicoke area. If you or anyone you know ever needs HVAC service in Etobicoke or the surrounding areas, HVAC Group is here to help!

Dave Neeb

16:03 30 Jul 25

Excellent and thorough, great pricing. Thanks again.

Response from the owner 17:28 30 Jul 25

Thank you, David! We’re glad we could help get your AC up and running again. We appreciate your kind words about our service and pricing—it means a lot. If you ever need anything in the future, don’t hesitate to reach out. Stay cool!

John Hamilton

19:58 25 Jul 25

The HVAC Group did a fantastic job restoring our broken AC . Quality professional workmanship at a fair price .We will definitely call them back next time .

Response from the owner 20:48 25 Jul 25

Thank you, John, for the 5-star review! We’re glad we could help with your AC repair and get your system back up and running. It’s great to hear you appreciated the quality workmanship and fair pricing. We look forward to helping you again whenever you need us! – HVAC Group

Katie Ogiba

01:17 25 Jun 25

HVAC Group came recommended by a friend when our AC stopped working on a 38 degree day. We had called other services and either couldn't get through or everyone was booked. When I spoke to Yiri he said it was so busy they were booked until next week (which I expected as every other place said the same thing). But he stayed on the phone to ask a few questions about the unit. He was kind, and you can just tell when someone actually cares - he didn't have to talk me through the possible issues etc. He ended up sending someone out that evening who fixed it within 15 minutes. We are so appreciated of the service- both the actual work done and the customer care. Highly recommend. Thank you to both Yiris!

Response from the owner 01:59 25 Jun 25

Thank you, Katie, for taking the time to leave us a 5-star review!We’re glad we could help with your AC not cooling issue — it really means a lot to us.At HVAC Group, we’re always happy to assist both returning and new customers with air conditioning repairs, new AC installations, or furnace service during the heating season. Don’t hesitate to reach out if you ever need help again.Thanks for trusting us!— HVAC Group

Andre

02:52 19 Jun 25

Great service - fast, knowledgeable, thoughtful, very professional! Helped me well and fast!

Response from the owner 11:41 19 Jun 25

Thank you, Andre, for taking the time to leave a review! We truly appreciate your support. Don’t hesitate to reach out if you ever need air conditioning or furnace repair in the future — we’re always here to help!

thariyor@gmail.com ariyo

22:47 10 Jun 25

HVAC Group responded quickly and had my noisy air conditioner fixed within a day. Their professionalism and customer-first approach really stood out. They go above and beyond—highly recommended!

Response from the owner 03:37 11 Jun 25

Thank you for the great review! We’re glad we could help with your noisy air conditioner so quickly. When you contacted us about your Lennox AC making unusual noise, our technician arrived the same day and found the outdoor condenser was clogged and the fan motor was extremely noisy. Since the AC parts warranty was still valid, we replaced the faulty motor and thoroughly cleaned the unit to restore quiet and efficient operation.We appreciate you choosing HVAC Group for your local AC repair in Mississauga. Your comfort is our priority!

Daniel Liu

19:04 04 Jun 25

HVAC group has been absolutely fantastic to help us replace our air conditioner. From diagnosing to replacement took only 2 days (since the replacement unit was in stock). This is especially appreciated as the weather was getting hot fast and I have a newborn baby that cries in the heat. Yura is extremely knowledgeable and Yuriy installed the unit professionally with no interruption and minimal noise to our house’s activities. Thank you for your help! HVAC group comes highly recommended and I’ll be reaching out to them for routine maintenance!

Response from the owner 22:00 04 Jun 25

Thank you so much for the wonderful 5-star review! We’re thrilled to hear you were happy with your Lennox AC installation experience. We understand how important a cool home is—especially with a newborn—and we’re glad we could respond quickly and get everything running smoothly in just two days. Yura and Yuriy truly appreciate your kind words. We’re always here when you need us, and we look forward to helping with your future maintenance needs. Thanks again for trusting HVAC Group!

Pranav Kumar

22:15 01 Jun 25

Got my thermostat changed and replaced the AC too. The price point is completely trust worthy and the service highly professional!

Response from the owner 22:57 01 Jun 25

Hi Pranav,Thank you so much for the great review! We’re glad you’re happy with the Lennox AC installation and thermostat replacement. It means a lot to hear that you found our pricing trustworthy and our service professional. We truly appreciate your support and look forward to helping you again in the future!— HVAC Group

Olena M

21:03 01 Apr 24

Amazing service, quick and clean replacement of the old water tank, we definitely recommend this team to anyone who would need installation or replacement

Daniel Campana

16:25 23 Mar 24

I had an issue with my Rheem furnace not heating, so I reached out to HVAC-group for assistance. The technician was quick to identify the problem as a faulty flame sensor. The service was prompt, efficient, and ultimately effective. I'm very pleased with their work and would highly recommend their services to anyone facing HVAC issues.

lakhbir phull

16:34 10 Mar 24

Excellent service, immediate response, reasonable price, very happy with their services.

Tina Obersnel

12:18 29 Jan 24

I highly recommend calling HVAC-GROUP for your maintenance and service needs. Yuriy was great. Quick to respond and resolve the issue. I am very happy with the outcome.

VIKKY

19:29 17 Jan 24

I was having problem with a tankless water heater here in edmonton !
I just googled about it and i found his contact number , and i got my problem solved , because i called him and he actually explained everything very clearly and amazingly! Thank you so much
My tankless water heater was showing E110 , i was unable to get that, but he told me that you need clean the air intake filter then i open the panel and did exactly what he told me to do. By that why i got my problem solved!
Thanks buddy

Stan Ivanov

15:37 20 Dec 23

I came from vacation to a broken furnace and a cold house. I called HVAC group late at night and they were able to send someone the next morning.

Technician was very professional, found that I had an igniter problem, had a spare part with him and solved the problem within an hour.

Reasonable pricing and very professional. Highly recommended!!!

Ingrid Turner

07:26 13 Dec 23

Yuri is a true professional and is a very knowledgeable expert about furnaces.
I called him for advice when another well known Hvac company wrongly diagnosed my Trane furnace blower noise and told me I needed to undergo a $1500 repair. Yuri quickly assessed the problem and voila no more blower motor problems. All for $140!!
Thank you Yuri! I highly recommend your service, honesty and expertise.

Anisha Mathews

18:19 29 Sep 23

Yuriy was very informative and helpful in selecting and installing our new furnace. His prices are very reasonable and the work was completed on time. He was also helpful in setting up our thermostat. I highly recommend his services!

Marah Di Nola

21:36 14 Aug 23

Exceptional customer service, immediate response by phone & text, professional workmanship!! Clean respectful, very impressed with the workmanship. Thank you once again. Highly recommend for HVAC, water heater replacement. Answered all my queries without hesitation or reservation. Will definitely 💯 use again!!

Perfect Climate, Always

Full-Service Thermostat Repairs from Local Experts

Thermostat Diagnostics and Troubleshooting

We locate and fix faults using digital sensors, multimeters, and voltage testers. Whether it’s a blown fuse, power issue, or control board failure, we get to the root of the problem fast.

Thermostat Wiring Repairs

Loose connections or damaged low-voltage wires can cause miscommunication with your furnace or air conditioner. Our thermostat technicians repair all standard wires, including R, C, W, and Y terminals.

Thermostat Replacement

If the thermostat is beyond repair, we offer thermostat replacement near Mississauga for all types—manual, programmable, and smart. We match your system’s voltage and HVAC compatibility for seamless upgrades.

Nest Thermostat Repair & Connectivity Fixes

Smart thermostats like Nest may suffer from Wi-Fi issues, syncing errors, or app failures. We fix Nest thermostat problems and restore full integration with your HVAC system and mobile app.

Honeywell Thermostat Repair

HVAC Group provide expert Honeywell thermostat repair for digital and smart models. Whether it’s a display issue, faulty sensor, or failed settings, we restore accurate, reliable control.

Power & Battery Repairs

No power? Our techs check for transformer failures, dead batteries, and C-wire problems. We restore your thermostat’s power source and correct voltage issues safely.

Calibration & Accuracy Testing

Inconsistent temperatures? We recalibrate heat anticipators, temp sensors, and differential settings to maintain accurate climate control and reduce HVAC cycling.

Having a HVAC problem? We’ll FIX it today!

We’re available 24/7 to restore your comfort. Call now for same-day service!

24/7 Service

(416) 807-2752

Energy-Saving Technology

Signs You Might Need Thermostat Repair

Thermostat Not Powering On

Blank screens usually mean power failure, low battery, or internal damage. We test circuits, replace batteries, and restore power to get your HVAC back on track.

Inaccurate Room Temperatures

If it feels hotter or colder than your settings, you might have sensor misalignment or poor placement. We fix and calibrate for accurate readings.

HVAC Not Responding to Thermostat

If your furnace or AC won’t start or shut off properly, the thermostat may not be communicating with the system. Our pros inspect relays and circuit boards to fix thermostat problems quickly.

Rapid On/Off Cycling

Short cycling wastes energy and wears down your HVAC. We adjust anticipators, replace sensors, and stop the frequent cycling for steady system performance.

Wi-Fi & App Issues with Smart Thermostats

Losing connection with your app or Wi-Fi? Our team handles Nest thermostat repair, router interference issues, and firmware updates for smooth operation.

Qulaity Brands We Work With

From Carrier to Trane – The Best AC Brands We Work With

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Beat the Heat with HVAC-Group

We Repair All Thermostat Types

Manual Thermostats

Basic dial or slide thermostats can fail from old wiring or worn-out contacts. We repair or replace for steady temperature control.

Programmable Thermostats

We fix misconfigured schedules, battery issues, and display problems in programmable models to ensure energy savings and consistent comfort.

Smart Thermostats

From Nest to Ecobee, we repair connectivity, app sync, and integration issues with HVAC systems and home networks.

Digital Thermostats

LCD issues or faulty buttons? We repair or replace digital models with precision and check for accurate sensor function.

Wireless Thermostats

RF or Bluetooth models can suffer from range issues or signal loss. We restore connections and battery life for stable communication.

Zoned Thermostats

Multi-zone systems need accurate communication between dampers and thermostats. We test each zone for proper airflow and temperature regulation.

Heat Pump Thermostats

Specialized systems like heat pumps require dual-mode compatibility. We fix setting errors, wiring faults, and defrost cycle malfunctions.

Stay in Control

From Homes to Businesses, We Provide Expert Thermostat Repairs For All Types of Properties

Residential

We repair and upgrade thermostats in Mississauga homes, condos, and apartments. Whether you need to fix a Nest thermostat, recalibrate your heat anticipator, or replace a failing unit, we ensure comfort all year long. We also ensure compatibility with zoned systems, furnaces, and central ACs.

Commercial

Our thermostat repair service also supports retail, office, and warehouse environments. We troubleshoot BMS-connected systems, multi-zone controls, and programmable commercial thermostats to maintain optimal temperatures for customers and staff.

Smart Home Comfort

Emergency Thermostat Repair – 24/7 Service in Mississauga

Thermostat failures can leave your HVAC system stuck or completely unresponsive. That’s why we provide emergency thermostat repair across Mississauga. Our team responds fast to diagnose power failures, loose wires, or failing smart thermostats—getting your system running again without delay.

Cut Energy Waste with Efficient Thermostat Repairs

A faulty thermostat can cause high bills and system strain. We improve HVAC efficiency through proper calibration, smart thermostat integration, and replacing outdated units. Whether you need to fix a thermostat or upgrade to a smart model, our service helps you reduce energy waste and save money.

Thermostats Made Simple

Fair & Honest Thermostat Repair Pricing in Mississauga

We offer competitive, upfront pricing for all thermostat repair services. Whether it’s battery replacement, wiring repair, or smart thermostat upgrades, our quotes include diagnostics, labour, and testing—there are no hidden fees.