A flat roof project designed for Greater Montreal
In Rosemont–La Petite-Patrie, we are modernizing the comfort of a plex by installing a Sharp Eco Inverter wall-mounted heat pump . Typical Montreal context: flat roof , brick chimney , recent elastomeric membrane and hatch access. The client's objective: to air condition the upper floor in the summer, heat efficiently in the off-season, while keeping the equipment discreet and secure.
Context and real needs
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Building: brick triplex, top floor apartment.
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Constraint: lack of backyard and protected facade — rooftop condenser preferred.
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Priorities: silence , low consumption , clean HVAC installation , simple maintenance.
The choice of equipment
The Sharp Eco Inverter is a wall-mounted heat pump known for its precise modulation, efficient low-temperature heating mode and Plasmacluster filtration. For this type of housing, it provides:
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Stable comfort thanks to the inverter (fewer compressor trips).
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Good performance/sound ratio for a flat roof near living spaces.
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Compact condenser format, ideal for the required roof withdrawals in Montreal.
Our flat roof method: safety, silence and waterproofing
1) Preparing the roof
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Visual inspection of the membrane and surveys around the chimney.
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Tracing of a dedicated technical corridor (no passage through water accumulation areas).
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Temporary non-slip protection to prevent punctures.
2) Raised support and load distribution
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Anti-corrosion aluminum frame fixed on treated wooden pads (beams laid flat) to distribute the loads and avoid the concentration of support points on the membrane.
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Integrated anti-vibration mounts to limit the transmission of vibrations to the structure – key to silence in lower housing.
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Snow guard and usable height: the device is raised to stay out of spring puddles and blown snow.
3) Refrigerated journey and crossings
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Insulated refrigerant connections and communication cable guided to the technical wall on the chimney side, then sealed crossing to the interior.
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Waterproofing carried out with flashing and membrane-compatible mastic , according to Montreal best practices on flat roofs.
4) Power supply and safety
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Disconnect box on masonry base near the condenser (easy access for maintenance).
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Wiring sized to the unit's gauge, with UV protected routing .
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Checking the earth and protections dedicated to the housing panel .
5) Professional commissioning
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Nitrogen test to detect the slightest micro-leak.
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Deep vacuum until stabilization, guaranteeing a dry circuit.
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Setting winter/summer mode, monitoring overheating and subcooling , reading intensities and validating air flow .
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Sound tests at occupied distance (landing and skylight).
Result for the customer
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Even temperature in the main rooms, lower bills in the off-season compared to electric baseboard heaters.
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Low vibration transmission: no nuisance felt in the apartment below.
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Roof preserved: no unnecessary perforations, well-distributed loads .
Key technical points of this achievement
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Type : wall-mounted heat pump (mini-split).
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Condenser location : flat roof on raised support .
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Controls : wall remote control + eco functions and smart defrost.
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Easy HVAC maintenance : accessible disconnection, compliant clearances, safe access.
Maintenance and longevity: our recommendations
A well-installed system lives better if it is properly maintained. Our HVAC maintenance plan includes:
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Cleaning of indoor/outdoor batteries and drain check.
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Annual check of the chassis fixing , the condition of the pads and the sealing joints.
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Control of refrigeration parameters and seasonal performance .
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UV cable and sheath inspection before winter.
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Instructions for use: clear snow around the condenser, avoid covering it, maintain an air corridor.
What to avoid on a roof
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Place the condenser directly on the membrane without load distribution.
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Increase the number of unsealed holes : risk of infiltration.
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Forgetting the disconnection within reach: complicated maintenance, non-compliance.
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Undersize the unit: short cycles, premature wear, poor comfort.
Typical lead times and coordination
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Technical visit: taking measurements, roof access, choice of route .
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Installation: often in one day , including electricity and commissioning.
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Submission of a photo report and maintenance instructions to the owner.
Eligibility for AirGreen programs and services
Depending on capacity , low temperature performance and configuration, a wall-mounted heat pump may be eligible for provincial grants . We verify eligibility and offer financing options for Montreal, Laval , Longueuil , North Shore and South Shore .
Why AirGreen for your flat roof projects?
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HVAC specialists in the Montreal context (plexes, condos, townhouses).
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Roofing expertise: supports, waterproofing, safe routes.
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Clear after-sales service : maintenance, priority troubleshooting, parts.
Need a careful HVAC installation in Montreal and the surrounding area?
We respond quickly in Montreal , Laval , Longueuil , as well as on the North Shore and South Shore . Tell us about your building: we size the heat pump and plan a durable, quiet and clean installation — just like in Rosemont–La Petite-Patrie.
Useful keywords : wall-mounted heat pump , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , flat roof, raised support, disconnection, roof waterproofing.