Installation of a Sharp wall-mounted heat pump on a rooftop in Montreal's Old Port
AirGreen installs Sharp ZU1 wall-mounted heat pumps on a roof in Montreal's Old Port: winter performance, secure installation, professional finish and lasting comfort for occupants.
- City
- Region
- Equipment
- Brand
- Challenges
- Published
The job on one screen
The article, chapter by chapter
On this project carried out in the heart of Montreal's Old Port , our AirGreen team installed Sharp wall-mounted heat pumps on the exterior, with condensers positioned on the roof of a typical residential building in the area: flat gravel roofs, views of the city centre, heritage masonry buildings and characteristic urban density.
This configuration requires special expertise: respecting the building structure, managing vibrations on a flat roof, electrical compliance, safety at height and optimizing airflow around the units.
A Sharp wall-mounted heat pump installation – consistent model: Sharp ZU1
Based on the brand name provided manually ( Sharp ) and the appearance of the condensers visible in the photo, we identified a configuration perfectly compatible with the Sharp ZU1 R-32 range, a series known for:
-
its high energy efficiency,
-
its reliable performance in Quebec's climate,
-
its discreet operation,
-
Its compact design is ideal for flat roofs and confined spaces in urban environments.
These are clearly wall-mounted heat pumps (mini-split) with independent condensers, placed on raised supports to ensure optimal ventilation and avoid any direct contact with the gravel on the roof.
Building context: a flat roof typical of the Old Port
The image depicts an iconic environment:
-
roofs of historic brick buildings,
-
modern downtown structures in the background,
-
private terraces, low parapets,
-
High urban density but sufficient space for a professional installation.
This type of architecture requires a robust, secure and weatherproof installation, while ensuring adequate performance even during episodes of strong winds coming from the river.
Technical details of the rooftop installation
We opted for a raised configuration with anti-vibration metal supports . This choice is motivated by several needs:
1. Protection against gravel and runoff
The condensers are placed on metal rails, themselves raised by blocks designed to distribute the load without damaging the roof membrane.
2. Reduction of vibration transmission
In urban environments, especially in older buildings, minimizing structural resonance is crucial. Anti-vibration pads have been installed to ensure quiet operation.
3. Spacing between units
We observed several condensers side by side, including a Sharp ECO Inverter . We respected the manufacturer's recommended distances to ensure:
-
adequate air circulation,
-
effective defrosting in winter,
-
simple and safe maintenance.
4. Management of refrigeration and electrical lines
The pipes are routed inside via a clean and watertight path, passing through a technical exit near the parapet.
The electrical boxes and protective devices are positioned on the adjacent metal structure to ensure easy access for maintenance.
5. Winter Resilience
Rooftop installations must support:
-
snow, ice, strong winds,
-
extreme temperature variations,
-
frequent defrosting cycles.
The Sharp ZU1 series is designed to offer stable performance down to approximately −25 °C , ensuring efficient heating throughout the winter.
A Sharp solution ideal for the Old Port
For a residential building in the Old Port, a Sharp ZU1 wall-mounted heat pump offers several concrete advantages:
-
Compact and efficient : perfect for limited rooftop spaces.
-
Inverter technology : intelligent power modulation, reducing electricity consumption.
-
Silent : a major advantage in an area where the proximity of housing requires discretion.
-
Reliable : proven performance in both cooling in summer and heating in winter.
For the occupants, the result is four-season comfort , lower energy costs and an outdoor installation that does not encroach on the interior living space.
The AirGreen approach: precision, safety and respect for Montreal buildings
Installing a heat pump on a rooftop in the Old Port requires superior technical expertise. Our AirGreen team handles:
-
Structural and logistical assessment to ensure the safety of the building and its occupants.
-
Selecting the right Sharp model based on actual needs and the layout of the premises.
-
Careful implementation : raised supports, vibration management, clean routing of pipes.
-
Complete tests at the end of installation : vacuuming, pressures, consumption, defrosting, noise.
-
Post-installation monitoring to ensure optimal performance throughout the year.
Each AirGreen installation aims to offer lasting comfort, intelligent aesthetics and optimal energy performance.
Are you looking for a Sharp installation in the Old Port or elsewhere in Montreal?
Whether you are in the Old Port , Ville-Marie, the Plateau, Rosemont, Verdun, Outremont, or elsewhere in Greater Montreal, we will expertly and transparently assist you in selecting and installing the Sharp heat pump best suited to your home or condo.
Request a free quote to discover how we can improve your comfort while reducing your energy costs.
The job tools
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.
How the job unfolds
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.
What we check on a job like this one
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
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.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
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.
The right pages, at the right time
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
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.
More jobs to see, near you
By town, by equipment or by region: browse more than 4,700 published projects.
Each dot: a town where AirGreen has published projects. The glowing dot: this job.
An on-site estimate, the right capacity, the right equipment.
The on-site estimate is free and the quote follows within 24 hours.
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).