Installation of a Sharp wall-mounted heat pump in Côte-des-Neiges–Notre-Dame-de-Grâce
Condo project in CDN–NDG: Sharp R-32 wall-mounted heat pump, discreet capping, gravity drainage and full commissioning. AirGreen — HVAC installation experts in Greater Montreal (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.
The context: a bright condo, a need for four-season comfort
In an apartment in Côte-des-Neiges–Notre-Dame-de-Grâce, our client wanted a compact HVAC system that would provide efficient cooling in the summer and supplemental heating in the winter, without encroaching on the living space. The living room's layout—a large southwest-facing bay window and a drop ceiling typical of concrete buildings—required a clean, short, and quiet HVAC installation . We recommended a latest-generation Sharp wall-mounted heat pump ( R-32 refrigerant ), known for its low consumption and reliability in cold climates.
Machine choice: why Sharp on this project
Sharp is among the recent wall units that combine:
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a responsive inverter compressor,
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an exchanger optimized for R-32 ,
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stable electronics in extreme cold ,
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contained sound pressure for condos.
For an average-sized Montreal home, the target power is usually between 12,000 and 18,000 BTU (after load calculation ). At AirGreen, we systematically size the machine after a technical visit: orientation, surface area, windows, insulation, infiltration and floors are taken into account. This approach avoids two classic pitfalls: oversizing (short cycles, discomfort, frost) and undersizing (lack of capacity during heat waves or prolonged cold).
Installation route: short, discreet and compliant
The interior head is placed at the top of the wall , above the bay window to promote natural air stratification. On this site:
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Single outward drilling with continuous slope for gravity drainage of condensate (no pump required, therefore zero additional noise and less maintenance).
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Refrigerant line kit and communication cable grouped in a white cover (capping) matching the wall; the visible path inside is limited to a short and clean lateral descent .
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Airtight sealing to prevent infiltration and thermal bridges, with closed-cell foam and exterior sealant.
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Outside, the lines are protected in UV capping and the condenser (not visible in the photo) is generally fixed on galvanized wall brackets or on an anti-vibration base depending on the facade and the regulations of the co-ownership association.
Result: a very discreet set, without visible wires, which preserves the interior aesthetics and daylight.
Key technical points validated by our team
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Controlled refrigeration length (typically 2 to 5 m on this type of condo): minimized pressure losses, vacuum calibration and addition of refrigerant according to the manufacturer's tolerances if the length exceeds the factory charge.
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Drainage slope ≥ 1/4″ per foot to prevent water from returning to the condensate pan.
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Dedicated power supply (circuit breaker according to nameplate amperage, cold climate rated cable, frost protection if required in the external trunking).
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Nitrogen leak tests , deep vacuum (< 500 microns), stabilization, then commissioning with measurement log (pressures, intensity, delta-T, discharge temperature).
Comfort and acoustics: priority to living spaces
Air conditioning is immediate thanks to the motorized louver that sweeps the living area. In heating mode, the airflow is directed slightly downward to limit stratification. Recent Sharp wall-mounted units boast very low interior noise levels in "Quiet" mode—a major advantage for open-plan condos. The exterior, meanwhile, features anti-vibration pads to prevent structural transmission to the balcony or load-bearing wall.
Operating yields and costs
Sharp R-32 heat pumps offer competitive SEER and HSPF . In practice, this translates to:
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electricity costs contained over the cooling season,
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efficient heating support in the fall and spring, with capacity maintained in the negative temperatures typical of Montreal,
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a reduction in dependence on electric baseboards.
Depending on the configuration chosen (and the presence of ENERGY STAR extreme cold certification), the installation may be eligible for certain active subsidies in Quebec. We validate these programs at the time of submission, as the criteria and envelopes evolve regularly.
Integration into a condo: rules, coordination and best practices
In co-ownership, every detail counts:
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Union authorization : we provide technical data sheets and installation plans for approval.
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Managing external noise : choice of supports, blowing direction, distance to neighboring windows.
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Wall crossing : compliance with the fire break and caulking adapted to the structure of the building.
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Water drainage : preference for gravity drainage ; the condensate pump is only considered if the slope is impossible, with safety tank and alarm.
Piloting and air quality
Recent Sharp wall heads offer:
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an intuitive remote control with Auto, Heating, Air Conditioning, Dehumidification modes,
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washable fine mesh filters and additional filtration options,
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automatic restart after power outage — useful during summer storms.
For indoor air quality , we recommend minimal HVAC maintenance : monthly dusting of filters during periods of use, and annual maintenance by our technicians (checking the refrigeration circuit, cleaning the coils, checking the drain and electrical connections).
Typical progress of an AirGreen construction site in CDN–NDG
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Technical visit : taking measurements, electrical readings, choice of indoor/outdoor location.
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Detailed quote : recommended power in BTU , line routes, options (color capping, supports, de-icing).
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Coordination with the union/manager and, if required, filing of technical documents.
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Installation (a typical day): surface protection, drilling, installation, pressure testing, instrumented commissioning .
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Submission of a file : photos, statements, usage advice, maintenance schedule.
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After-sales service : prioritization during hot weather and maintenance reminders.
Pitfalls to avoid (feedback)
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Drilling too low : water stagnation and overflow in high humidity. We systematically maintain a steep slope towards the outside.
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Oversized refrigeration line or tight bend near the flair: sources of premature leaks. We respect the bend radii and redo the flares to the prescribed torque .
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Installation above a curtain box : turbulence and noise, uneven distribution. Here, height and frontal clearance are optimized.
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Electricity shared with other loads: risk of tripping. A dedicated line is installed.
Maintenance and longevity
A simple schedule maximizes lifespan:
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Every 4 to 6 weeks in summer: rinse the filters.
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In spring : heating test, drain check.
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In the fall : complete inspection by AirGreen (tightening, electronics, pressures, fan cleaning, anti-icing check).
What if you are considering multi-zone?
For condos or plexes with several distinct areas (bedrooms, office), the MultiZone heat pump is an alternative. Sharp offers 2 to 3 zone configurations with a single outdoor unit. We evaluate the balancing of lengths and simultaneity of use to maintain efficiency.
What the customer gains from CDN–NDG
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Stable comfort and silence in the living room.
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Aesthetics : short paths and discreet capping , no condensate pump.
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Seasonal savings on off-season cooling and heating.
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Traceability : documented commissioning and clear advice.
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Local support : local service covering Montreal , Laval , Longueuil , North Shore and South Shore .
Frequently Asked Questions (short version)
Can I heat in the middle of winter?
Yes, as a backup: the machine maintains good capacity in the negative temperatures common in Montreal. For primary heating, we are evaluating other options (e.g., central heat pump ).
Do you need a condensate pump?
When the location allows for gravity slope , we avoid it to eliminate additional noise and maintenance.
Is this eligible for aid?
Depending on the certified configuration and current programs. We verify eligibility upon submission.
Conclusion
This Sharp HVAC installation in Côte-des-Neiges–Notre-Dame-de-Grâce illustrates our approach: rigorous sizing , short paths and gravity drainage , all with instrumented commissioning. The result is a reliable , economical and almost invisible system on a daily basis—exactly what many co-owners in Greater Montreal are looking for.
Areas served : Montreal , Laval , Longueuil , North Shore , South Shore .
Need technical advice on your condo or complex? Our team will guide you from choosing a wall-mounted heat pump to annual HVAC maintenance .
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.
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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).