$49 / month O.A.C Including Install
$49 / month O.A.C Including Install

24 / 7 Emergency Service Available. Call Us Now: 1.844.894.6832

Durham Region Air Conditioning Repair, Service and Installation

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As part of Daikin Industries, a Fortune 1000 company, McQuay is one of the largest air conditioning, heating, ventilating and refrigeration companies in the world. They have earned a worldwide reputation for providing a full line of quality products and expertise to meet the demands of their customers.


CODE: E1.
RESULT: Compressor 2 low pressure faulty.

CODE: E2.
RESULT: Compressor 2 high pressure faulty.

CODE: E3.
RESULT: Compressor 2 overload.

CODE: E4.
RESULT: Indoor coil 2 temperature sensor fault.

CODE: E5.
RESULT: System 2 leaving water temperature 2 faulty.

CODE: F2.
RESULT: Indoor coil 1 temperature sensor fault.

CODE: F4.
RESULT: Return air temperature sensor fault.

CODE: F6.
RESULT: Communication faulty.

CODE: F9.
RESULT: Compressor 1 refrigerant leak.

CODE: FE.
RESULT: Compressor 2 refrigerant leak.

CODE: H1.
RESULT: Compressor 1 overload.

CODE: H4.
RESULT: Compressor 1 high pressure faulty.

CODE: L1.
RESULT: Compressor 1 low pressure faulty.

CODE: L3.
RESULT: Temperature of water entering too high or low.

CODE: L4.
RESULT: Water flow switch faulty.

CODE: L5.
RESULT: System 1 leaving water temperature 1 faulty.


See What Our Customers Are Saying:

by Private User on Twintech Heating and Cooling

I left a live chat message on their website that my air conditioning was not working. Within 1hr a representative called me to discuss my options.
The next day he came to the house to review my needs and give me a price for a new system. Price quoted was less than I expected and the installation was completed the following day. I found their salesman and the installers very knowledgeable and easy to deal with. All my questions were answered. Everything was properly explained in regards to what unit was needed and why, along with instruction where needed for use.
The installers made sure everything was working properly before they left.

by Samta Chanana on Twintech Heating and Cooling

This is to thank Twintech Heating and Cooling for their exceptional and timely service. Mitch, their technician was very courteous and generous with his time right from his first meeting with us. He not only took the time to check everything but also educated us on why we needed what he recommended. Greg and Mitch graciously accommodated us on our requested day and time for job to be done. They were both very courteous and responsive to our needs and special requests especially in a tight spot. The job was finished neatly and on time. Thank you Twintech for your great service !

by Private User on Twintech Heating and Cooling

They came the day and time they had planned for us and were very fast and efficient! The AC works amazing and it is amazing during the heat of the summer we have already got! Thanks for everything you did for us!

by Private User on Twintech Heating and Cooling

Would recommend this company to friends and family in a heartbeat. Very professional , on time and left no mess when the job was done.

by stefany on Twintech Heating and Cooling

Great customer service. Responsive and professional. I would highly recommend Twintech, I used them previously for repair service and a new air conditioner- very satisfied.

by dianeramsden on Twintech Heating and Cooling

Our air conditioner failed. Made a call and within 15 min a technician was at our door.
The issue was fixed and many suggestions were provided.
Thanks to Mitch. Great service !

by Kazuko on Twintech Heating and Cooling

Our furnace was rattling, as soon as we put our air conditioner on this past week. We had researched looking for a company that was Registered with Better Business Bureau, and this company TwinTech, had A+ Rating. Scott, was immediately helpful via text/phone and sent his technician as soon as he was able...Mitchell/technician provided great professional service. Thank you TwinTech.
Sean and Debbie

by ANOOP on Twintech Heating and Cooling

I contacted various companies when looking to install a new furnace and I found Twintech to be transparent with their communication and approach. They had options to suit my various requirements and the price vs quality was very good. The after installation communication was also very good and they answered all queries I had.

by Private User on Twintech Heating and Cooling

My furnace broke down last month. The team was quick to respond, courteous, professional and mindful of COVID-19 concerns. I highly recommend them if you are considering replacing or servicing your HVAC equipment.

by Private User on Twintech Heating and Cooling

I was very happy with the installation and price. I would definitely recommend. Thank you Twintech.

See What Our Customers Are Saying:

by Aaron on Twintech Heating and Cooling

We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.

by Linda on Twintech Heating and Cooling

Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

by Robert Mizuno on Twintech Heating and Cooling

We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

by Ruth on Twintech Heating and Cooling

TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

Make Your Home Comfier with These Great Tips

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - May 7, 2018

The summer heat, as well as the humidity, can make your home just as comfortable as it is during the winter, but there are some things that you can do and tools that you can use to keep your abode as comfortable as possible – no matter how hot

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Twintech - Trusted Heat Pump Sellers and Consultants in Whitby

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - April 21, 2025

When it comes to energy-efficient, year-round comfort in the Town of Whitby, more and more homeowners are turning to heat pumps. And when you're looking for a trusted expert to guide you through the process of selecting, installing, and mainta

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Window AC making room more humid

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - August 9, 2023

I have a Midea 5000 btu air conditioner and when it kicks off the humidity quickly rises to about 80% then when it comes back on it drops back into the 60s, why is it doing this Question from user busnerd20 at AirConditioners at reddit. Answer

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Why is My AC Being So Loud?

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - April 3, 2024

A loud air conditioning unit can be caused by various factors. Here are some common reasons why your AC might be noisy: Dirty or Clogged Filters: Accumulated dirt and debris in the filters can obstruct airflow, causing the unit to work harde

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