Leaders in air conditioning installation and service

Montreal’s largest and most innovative air conditioning and ventilation contractor since 1957 with 40 service vehicles on the road 24 / 7. Guaranteed Industries specializes in the design, installation, service and maintenance of HVAC systems for the commercial, industrial, residential and institutional sectors.

Latest News

Receive up to a $1,600 rebate

September 13, 2018

Receive up to a $1,600 rebate with the purchase of a qualifying Lennox home confort system.  

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20% off on new maintenance contracts

December 15, 2016

*Off the first year of a 3 year contract. Special Internet offer for new accounts. The C.O.A. (Check-Oil-Adjust) service...

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Save $100 on a Ductless air conditioning system

20% off on new maintenance contracts*

Customer Reviews

Installed promptly the condensor unit and tested everything to make sure all was good.


Installation was done on time. The mechanical work was really well done and they cleaned up after themselves. They could have used more training on the new electronics, specifically the iComfort S30 and the iHarmony zoning. A defect in the compressor took a long time to diagnose but was replaced no questions asked. They could have also been more responsive...I had to prompt them more often than should have been the case. Overall this dealer is just a whisker shy of excellent in most areas and I would recommend it highly.


We had a breakdown of our water cooled system and had to replace it quickly. The team from Guaranteed identified the new Lennox system that we required. When it was ready for delivery they came as a team and worked very efficiently and quickly to make sure that it was up and running that same day. We very much appreciated the extra effort they provided.


Purchase and installation of air-condition apparatus


My 30 plus year old Lennox finally quit after years of maintenance free service. Decided to replace rather than repair. New Lennox now efficiently cooling the house.. not required to heat yet. The sound level is a little higher than expected however.

Valve guy

Guaranteed Industries did a great job. They arrived on time, as scheduled, finished within a day and left the work area neat and clean.

Lionel Moses

Love the system. Thermostat amazing & easy to use.