A neat and efficient installation for optimal comfort, even on a flat roof
At AirGreen , we recently completed a complete installation of a Midea EVOX G3 central heat pump in the Saint-Laurent area of Montreal. This project perfectly illustrates our expertise in rooftop HVAC installation, where technical precision and structural durability play a key role in ensuring maximum performance and long-term reliability.
A central heat pump designed for the Quebec climate
The Midea EVOX G3 is a new generation central heat pump operating on R-454B refrigerant , designed to offer stable performance down to -30 °C . This model, with a capacity varying between 2 and 5 tons , is recognized for its superior energy efficiency and its compatibility with modern electric heating systems.
Its inverter compressor continuously adjusts power, allowing for reduced energy consumption and constant thermal comfort in all areas of the home.
Installation details: stability, safety and precision
The outdoor unit was installed on a flat roof , an environment requiring meticulous planning. Here are the main technical elements of the installation:
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Galvanized steel raised stand : designed to provide excellent mechanical stability while allowing good air circulation around the unit.
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Fixing on treated wooden sleepers and insulating base : these elements prevent any vibration transmission to the building structure and prevent moisture infiltration.
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Electrical connection protected via a waterproof box and external circuit breaker, complying with CSA and RBQ electrical standards.
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Optimized gravity drainage thanks to a slight inclination of the support, avoiding any accumulation of water under the unit, essential for cold seasons.
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Protected and insulated refrigeration duct routing , with a short and direct route to minimize heat loss.
All assembly was carried out in the evening, in order to respect the operating hours of the commercial building and limit service interruptions.
A sustainable and energy-efficient choice
The Midea EVOX G3 stands out for its intelligent control system that automatically adapts the fan and compressor speed according to actual thermal needs.
Thanks to its R-454B technology , this heat pump significantly reduces environmental impact, offering a carbon footprint up to 78% lower than systems using R-410A.
In addition, it is eligible for several grant programs in Quebec, including those linked to Transition Énergétique Québec (TEQ) for high energy efficiency appliances.
Challenges encountered and solutions provided
Installing a central heat pump on a flat roof involves several technical constraints:
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Equipment weight and structural strength of the roof : a preliminary check of the permissible load was carried out before installing the support.
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Electrical safety and compliance : The wiring has been secured in a rigid metal conduit with waterproof connectors.
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Weather Protection : Sufficient space has been provided to allow snow runoff and prevent areas of ice accumulation around the unit.
These precautions ensure system longevity, reduce maintenance requirements and ensure stable performance throughout the year.
The result: efficiency, silence and comfort
After commissioning, pressure and temperature tests confirmed optimal performance , with a coefficient of performance (COP) greater than 4.5 in heating mode .
The unit operates quietly , thanks to its rotary compressor and integrated sound insulation. Occupants now enjoy constant comfort, without temperature fluctuations, even on the coldest nights.
Why trust AirGreen for your HVAC projects in Montreal?
At AirGreen, every installation is planned, validated, and executed according to the highest HVAC industry standards . Our RBQ-certified team, partnered with leading brands (Midea, Gree, Fujitsu, Sharp, Zephyr, etc.), ensures:
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Complete expertise , from choosing the model to commissioning;
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Installations that comply with Quebec electrical and mechanical standards ;
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Customized solutions for each type of building;
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Reliable and transparent after-sales service .
We serve all of Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore , and we make it a point of honor to offer aesthetic, secure and efficient installations .
Conclusion: an exemplary project in Saint-Laurent
This Midea EVOX G3 central heat pump installation in Saint-Laurent illustrates the quality of AirGreen work: a perfect balance between energy efficiency, technical precision and compliance with HVAC standards .
Thanks to this system, the building now benefits from superior comfort and significant energy savings—a sustainable, reliable solution adapted to Quebec's harsh winters.
AirGreen – Heat pumps, air conditioning and heating in Montreal, Laval, Longueuil, North Shore and South Shore.
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