Installation of a Sharp wall-mounted heat pump in Rosemont–La Petite-Patrie
AirGreen installs a Sharp R-32 wall-mounted heat pump in Rosemont–La Petite-Patrie : high installation above a window, gravity drain, discreet cover and rigorous commissioning. Greater Montreal service: Montreal, Laval, Longueuil, North Shore, South Shore .
Take a tour of the installation
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.
Four-season comfort in a narrow stairwell: our step-by-step approach
The request is clear: to ensure efficient summer cooling and winter supplemental heating in a typical Rosemont–La Petite-Patrie duplex, without encroaching on the living space. At AirGreen , we offer a clean, sustainable HVAC installation designed for Montreal realities. Here, we are installing a Sharp wall-mounted heat pump (recent generation with R-32 refrigerant ), positioned high above a window in a stairwell . This strategic placement maximizes air stratification and comfort distribution to the landings.
Customer context and performance objectives
The client lives in a Montreal plex with renovated gypsum walls , a narrow stairwell and high ceiling drops . The objectives:
-
Keep the staircase and landings pleasant, while relieving adjacent rooms of heat peaks .
-
Reduce the use of electrical backups in mid-season thanks to the heat pump function .
-
Preserve aesthetics: no visible ducts , discreet casing on the outside, silence on the inside.
The wall-mounted heat pump is ideal here: compact size, high efficiency and fine modulation of the inverter compressor to precisely monitor the thermal load.
Why a Sharp R-32 wall unit?
-
Proven reliability and quiet operation, essential in a busy area.
-
R-32 : new generation refrigerant, more energy efficient and with reduced global warming potential compared to older generations.
-
Extreme cold operating range adapted to the Montreal climate, useful for heating in the off-season and as a supplement in winter.
-
Easy-access filters for simplified HVAC maintenance by occupants.
Note: in this type of space, a single, well-positioned wall-mounted head can create a beneficial chimney effect , circulating the air from top to bottom and homogenizing the temperature towards the upper floors.
Design and positioning: millimeter precision
Height and clearances. The unit is installed high under the ceiling , centered above the window frame . We respect the manufacturer's clearances for a free air intake and a blower that runs along the shaft without directly hitting the users—limiting the sensation of drafts.
Support and anchors. The wall plate is anchored to the studs with fasteners sized for shearing and tearing . A laser level ensures perfect plumb (essential for condensate drainage ).
Drilling. A single drilling of approximately 65 mm is made behind the device , with a continuous slope towards the outside for the gravity drain . The cross-section is sheathed to avoid any friction of the connections.
Refrigeration connections. The insulated copper tubes (outgoing/return) and the power/communication cable are gathered into a neat bundle , strapped, and then routed outside. Outside, they are protected by a UV-stable white cap , discreet on the facade.
Condensate management. The drain is installed by gravity , which eliminates the noise and maintenance of a pump. The slope is controlled throughout; a non-return loop prevents odors from rising.
Special features of a stairwell: controlling the airflow
-
Blowing directed towards the volume and not towards the window: we adjust the angle of the shutters to create a laminar flow descending along the shaft.
-
“Quiet” mode for quiet hours: the minimum speed reduces the noise level while maintaining the set temperature .
-
Sensors : the head continuously measures the suction temperature; we set a setpoint taking into account the rising heat from the stages.
Result: a reduced thermal gradient , more comfortable landings and a lower load on other existing units or heaters.
Commissioning: rigor and traceability
-
Flares calibrated to the torque, tightening torques respected.
-
Nitrogen leak test , then deep vacuum ( < 500 microns ) with stability control.
-
Opening of the fluid , checking of pressures , overheating and subcooling according to the outside temperature.
-
Acoustic test at progressive speeds , control of vibrations and resonances on the wall.
-
Mode settings (Auto/Heat/Cold), automatic restart in the event of a power cut, and shutter sweeping .
Each step is documented to ensure sustainability and facilitate maintenance monitoring .
Recommended HVAC maintenance
-
Clean filters every 2–3 months (more frequently during pollen season).
-
Gentle disinfection of exchangers once per season—limits dust and allergens.
-
Annual inspection by AirGreen: electrical check, drain , fasteners , and performance trends (air/air temperatures, intensity, pressures).
-
Outside: ensure that the capping remains watertight and that the drain flow is free.
This simple HVAC maintenance maintains efficiency and extends lifespan .
Grants and local compliance
Recent generation R-32 wall-mounted heat pumps may be eligible for current Quebec programs (based on performance and operating temperature criteria). We verify eligibility lists , help gather parts and provide the necessary proof of installation . Our team is RBQ licensed and applies the electrical and HVAC standards in use in Greater Montreal (Montreal, Laval , Longueuil , North Shore , South Shore ).
Common pitfalls avoided by AirGreen
-
Bad drain slope : source of leaks and odors → electronically controlled throughout the line.
-
Insufficient anchoring in light partitions → search for studs , suitable metal anchors.
-
Blowing on glazing : risk of stratification and fogging → optimized orientation of the shutters.
-
Oversizing or undersizing : load calculation adapted to the stairwell and the areas served.
-
Noise : choice of quiet operating range and anti-vibration pads .
Result: tangible comfort and preserved aesthetics
-
Uniform temperature between the bottom and top of the stairs, even during heat waves .
-
Controlled consumption thanks to the inverter and good sizing .
-
Discreet integration: the unit blends into the decor; no visible cables .
-
Easy access for maintenance: filters on the front, clean external cover.
The customer benefits from four-season comfort and enhanced property value through professional and traceable installation.
Practical advice for plex owners in Montreal
-
In stairwells , aim for a high position with adequate clearances so that the jet covers the landings.
-
Favor gravity drainage of condensate when the facade allows it.
-
Think maintenance : clean filter = efficiency and silence .
-
For buildings facing the street and the courtyard , anticipate the shortest connection path and the least visible capping .
What we support
-
Technical visit , sizing and advice on the appropriate Sharp choice (usual capacities 9,000 to 24,000 BTU).
-
Complete HVAC installation : drilling, connections, power supply, commissioning .
-
Grant application (depending on eligibility) for Montreal, Laval , Longueuil , North Shore and South Shore .
-
After-sales service and annual HVAC maintenance .
Are you looking for a wall-mounted heat pump that's as discreet as it is efficient for your apartment complex in Rosemont or its surrounding neighborhoods? AirGreen takes care of everything, with the quality and rigor that have made our reputation.
Useful keywords: heat pump , wall-mounted heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Sharp , R-32 .
The big day, step by step
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 would it look like 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.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
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.
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.
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.
Every house has its constraints. We see them before we install.
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).