A flat roof installation designed to last, by AirGreen
At AirGreen , we work weekly on flat roofs in Greater Montreal to install wall-mounted heat pumps for businesses, offices, and condominiums. This project in Anjou illustrates our approach: a careful, safe HVAC installation optimized for Montreal's climate, with a Daikin condenser installed on raised rails, well-insulated refrigeration connections, and a dedicated outdoor disconnect box .
Building context and comfort objectives
The client wanted to stabilize the temperature of an office space year-round, reduce operating costs, and improve the reliability of the existing system. We recommended a Daikin wall-mounted heat pump in a single-zone configuration, sized for the actual heat load of the rooms. Installation on a flat roof facilitates maintenance, frees up floor space, and prevents disturbances on the facade.
What exactly we install
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Daikin condenser mounted on raised composite/treated wood rails, with anti-vibration pads to limit vibration transmission.
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Sheathed refrigeration connections and continuous UV insulation (elastomer foam + protective tape), direct route to the technical column.
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Sheathed and secured communication and power cabling , with service curves respecting the minimum conductor radius.
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Labeled exterior disconnect box for quick identification, positioned on the neighboring metal footprint for safe interventions.
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Defrost management : peripheral clearance respected so that meltwater can drain freely, even in freezing conditions.
These elements, visible on the construction site, guarantee the longevity of the machine and simplify seasonal maintenance.
Why a Daikin wall-mounted heat pump for this Anjou site?
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Heating and cooling efficiency : the heat pump provides high seasonal efficiency and substantial savings compared to resistive electric systems.
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Cold weather reliability : Recent Daikin units maintain useful capacity below zero, a critical point for Montreal , Laval and the North Shore .
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Quiet operation : essential for a working environment.
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Modularity : possibility of adding a later area if the office layout changes.
Steps for installing AirGreen on a flat roof
1) Study and sizing
We measure the thermal load , access constraints, lifting height and distance to drillings. The aim is to reduce the refrigerated length and avoid unnecessary oil siphons .
2) Mechanical implantation
We position the condenser on raised rails with a distributed weight, so as not to puncture the roof membrane. A minimum clearance is maintained all around the unit for air intake and exhaust.
3) Refrigerated transport
The copper pipes are silver-brazed under nitrogen, then nitrogen-tested and maintained under pressure during the deep vacuum phase. The insulation is continuous, UV-protected, and the connections are secured to withstand wind.
4) Electricity and safety
We install an easily accessible outdoor disconnect box and a properly sized service cable . Grounding and circuit breakers are checked according to the appliance's nameplate.
5) Commissioning
After vacuuming , we open the valves, carry out a leak test , set the operating modes, and validate superheating and subcooling . A commissioning report is given to the customer.
Salient installation details
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Support : Rails laid on the gravel layer with spacers, perfect for load distribution and unit alignment.
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Route : Refrigeration lines and cabling join a nearby metal formwork , which reduces exposure to sun and wind, and ensures a sealed entry into the envelope.
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Electrical : Outdoor disconnect box labeled “408” for immediate identification by the maintenance team.
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Climate protection : UV insulation and cold-resistant fasteners to prevent cracking in winter.
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Maintenance : sufficient clearance for cleaning batteries and accessing connectors, which lowers HVAC maintenance costs.
Results measured after commissioning
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Stabilized temperature in the open space and adjoining offices.
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Reduced noise : installation on rails and pads limit vibrations transmitted to the structure.
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Controlled consumption : initial readings show a reduction in air conditioning operating hours thanks to better humidity control.
AirGreen Tips for a Flat Roof in Montreal, Laval, Longueuil, North Shore and South Shore
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Snow/ice clearance : keep a clear perimeter for water drainage during defrosting cycles.
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UV protection of insulation: compatible tape and suitable sleeves, to be inspected at each HVAC maintenance .
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Fasteners : annual checks of screws and supports, especially after strong winds.
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Cleaning the exchangers : gentle washing during the hot season to maintain performance.
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Refrigerated path : prioritize compactness; beyond the lengths recommended by the manufacturer, provide oil management accessories.
Grants and Eligibility
Efficient and certified wall-mounted heat pumps may be eligible for assistance programs in effect in Quebec. For each project, we confirm eligibility based on the Daikin model , power, and cold weather heating performance. Our team assists the client in preparing files to maximize financial returns.
Good sustainability practices
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New generation refrigerant according to the series installed by our team and compliance with recovery procedures.
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Selection of robust components : circuit breakers, boxes and exterior connectors rated for roof use.
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Traceability : clear labeling of circuits and maintenance log integrated into the documentation provided at the end of the work.
What the customer gains with AirGreen
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A single point of contact for HVAC study, installation and maintenance .
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Installation in accordance with local standards and manufacturer recommendations.
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Energy savings from the first season and stable comfort all year round.
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A service available throughout Greater Montreal : Montreal , Laval , Longueuil , North Shore and South Shore .
Conclusion
This Daikin wall-mounted heat pump installation in Anjou illustrates our approach: rigorous calculations, careful installation on a flat roof , safe exterior wiring and disconnection , and finishes adapted to local winters. The result is controlled comfort and reduced operating costs. At AirGreen, we place the same high standards on every HVAC installation in Greater Montreal, whether it's a small office space, a commercial space, or a condominium.