Installation of a Panasonic MultiZone heat pump on a flat roof in Rosemont–La Petite-Patrie
AirGreen installs Panasonic MultiZone heat pumps on flat roofs in Rosemont–La Petite-Patrie, a reliable and sustainable HVAC solution for Montreal and the surrounding area.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
A discreet and efficient integration for a Montreal building
At AirGreen , we regularly undertake complex projects where technology must blend with the existing architecture. In this specific case, our team worked in the Rosemont–La Petite-Patrie neighborhood to install several Panasonic outdoor units on a flat roof . The goal: to provide four-season comfort to a residential building while optimizing the available space and respecting the building's aesthetics.
Project background
The building in question, typical of Rosemont's urban fabric, combines several dwellings. Choosing a MultiZone heat pump was the best solution for providing heating and cooling to different spaces without cluttering balconies or facades. Rooftop installation ensures discreet operation and optimal performance.
Features of Panasonic heat pumps installed
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Type: Multi-Zone heat pump (multi-zone mini-split)
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Brand: Panasonic
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Capacity: Suitable for covering multiple living areas (compact models optimized for residential performance in cold climates)
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Energy performance: Energy Star certified, reliable operation down to -25°C, ideal for Montreal winters
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Grant compatibility: eligible for provincial and federal energy efficiency programs
These units are known for their stable performance , low noise levels and ability to provide consistent comfort throughout the year.
Technical challenges and solutions
1. A flat roof exposed to the elements
Installing on a flat roof involves carefully anticipating snow loads, runoff and temperature variations.
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We used raised stands to protect the units from water and ice buildup.
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The anchoring was carried out using plates designed for roofing, guaranteeing stability without compromising the waterproofing of the membrane.
2. Length and route of refrigerant connections
Since the condensers are located on the roof, it was necessary to plan an optimal route for the pipes to the apartments.
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Our technicians have installed discreet and perfectly insulated capping , guaranteeing both mechanical protection and energy efficiency.
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The openings were carefully sealed to maintain the integrity of the building envelope.
3. Condensate management
To avoid any drainage problems in winter, a gravity drainage system was designed. With this type of configuration, this eliminates the need for a lifting pump, thus reducing future maintenance.
Benefits for occupants
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Four-season comfort : efficient heating in winter, effective air conditioning in summer.
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Freed up space : no clutter on balconies or facades, the condensers being placed on the roof.
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Energy savings : high efficiency and eligibility for financial assistance programs (including LogisVert and federal subsidies).
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Durability : installation designed to withstand the harsh climate of Greater Montreal.
Proven expertise in Greater Montreal
This type of project illustrates AirGreen's ability to adapt each HVAC installation to the realities of the building. Whether in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we strive to provide personalized solutions that combine performance, durability and aesthetics.
Our teams of RBQ-certified technicians are experts in safety standards and installation best practices, ensuring fast and reliable commissioning.
Practical advice for building owners
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Favor rooftop installation when ground or facade space is limited.
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Choose MultiZone heat pumps to serve multiple apartments or separate zones.
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Ensure installation is carried out by a certified contractor to maintain the validity of warranties and maximize your chances of obtaining grants.
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Schedule regular HVAC maintenance (cleaning coils, checking refrigerant gas, inspecting drains) to ensure system longevity.
Conclusion
Thanks to this installation of Panasonic MultiZone heat pumps on a flat roof in Rosemont–La Petite-Patrie , the building now benefits from a reliable, quiet, and economical heating and cooling system. At AirGreen, we understand that every project is unique: our role is to transform technical constraints into sustainable solutions tailored to our clients' real needs.
How it goes, from the first call to the end
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
And at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
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What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).