A flat roof adaptation to maximize comfort and energy efficiency
At AirGreen , we know that every building in Montreal has its own architectural characteristics. This is precisely the case for a residential building in the Rosemont–La Petite-Patrie district, where our team recently installed a Lennox wall-mounted heat pump . The challenge: finding a safe and optimal location for the outdoor condenser, while respecting the constraints of a flat roof typical of Montreal plexes .
Context of the intervention
The client, a condo owner in a 1960s brick building, wanted to upgrade his comfort with a high-efficiency heat pump. The choice fell on a Lennox wall-mounted unit with a capacity suitable for a medium-sized home (approximately 12,000 BTU). The goal: to ensure optimal comfort in both summer and winter, while reducing energy bills thanks to this model's high energy efficiency.
Technical details of the installation
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Machine type : wall-mounted heat pump (mini-split).
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Brand : Lennox.
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Capacity : approximately 12,000 BTU, suitable for a space of 900 to 1200 sq. ft.
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Installation location : Rosemont–La Petite-Patrie, on a flat roof.
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Support : galvanized steel structure placed on treated wooden pads to protect the roof membrane and distribute the load.
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Refrigeration connection : ducts and pipes routed via a technical chimney.
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Drainage : gravity drainage facilitated by the natural slope of the roof.
The outdoor unit was securely mounted on raised supports to avoid direct contact with the gravel and prevent the accumulation of rainwater or snow. Particular attention was paid to protecting the roof membrane, which is essential for the longevity of the structure.
Challenges encountered and solutions implemented
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Constraints related to the flat roof :
On gravel roofs, it is crucial to distribute the weight of the condenser to avoid any perforation of the membrane. We used calibrated wooden pads and metal rails to provide optimal stability. -
Conduit management :
The refrigeration and electrical connections were carried out through the existing technical chimney, which reduced the number of holes and protected the pipes from the weather. -
Noise and vibrations :
To limit sound transmission to neighboring homes, the device has been installed on anti-vibration supports , ensuring silent operation, especially during hot summer nights.
Customer Benefits
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Four-season comfort : efficient heating even in Montreal's winter temperatures.
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Energy savings : higher efficiency compared to old electric heating systems.
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Possible subsidies : depending on the exact model and its cold performance, certain Lennox heat pumps may be eligible for Quebec's energy transition programs.
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Reliability : installation carried out according to RBQ standards and AirGreen HVAC best practices.
AirGreen expertise in the field
This project perfectly illustrates our ability to adapt each installation to the realities of Greater Montreal buildings. Installation on flat roofs requires specific expertise: choice of supports, management of condensate drainage, safety of conduit passages, all while ensuring maximum performance of the device. Our teams are trained to anticipate these constraints and deliver impeccable results.
Why choose AirGreen for an HVAC installation in Montreal?
With hundreds of installations completed each year in neighborhoods like Rosemont, Villeray, Hochelaga, and the Plateau, AirGreen has established itself as a trusted player in residential HVAC installation . We support our customers every step of the way: choosing the unit, designing the configuration, professional installation, annual maintenance, and grant assistance.