Installation of a Zephyr wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a wall-mounted Zephyr in Rosemont–La Petite-Patrie: corner installation, short run, gravity drain and rigorous commissioning. AirGreen, HVAC experts for Montreal, Laval, Longueuil, North Shore and 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.
Careful installation in the corner of the room to maximize comfort and preserve aesthetics
In a typical Rosemont–La Petite-Patrie plex, our team installed a Zephyr wall-mounted heat pump to provide 4-season comfort with minimal visual presence. The indoor unit is positioned high, at the junction of two walls and near a window, a location that promotes even air diffusion while keeping the walls clear for furnishings. The goal is clear: performance , silence , and discretion , without compromising on the quality of execution.
Customer context and site challenges
The apartment features classic Montreal apartment features: drywall, woodwork, street-facing windows, and noticeable temperature variations between the facade and interior rooms. The needs expressed: pleasant air conditioning in the summer, efficient supplemental heating in the mid-seasons, reduced electricity bills compared to traditional convectors, and a discreet system that doesn't disrupt the decor or traffic flow.
Why the Zephyr wall-mounted heat pump meets the need
Technical and usage advantages
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Air conditioning and heating mode in a single device, useful for Montreal where the seasonal difference is significant.
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High efficiency in heating mode down to low temperature (Zephyr range adapted to the climate of Greater Montreal).
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Low noise level , beneficial in an apartment where the living room adjoins the bedrooms.
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Simple design that fits easily into an urban interior .
Responsible sizing (BTU)
To ensure a high-performance installation, we assess: usable surface area, window orientation, number of occupants, airtightness, and heat-generating appliances. Sizing avoids two common pitfalls:
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Undersizing : device overloaded, discomfort on very hot/cold days.
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Oversizing : short cycles, loss of efficiency and premature wear.
Our recommendation is based on a calculated heat load rather than just square footage.
Inner head implantation: precision and airflow
Positioning at the top of the wall
Placing the unit near the ceiling improves air stratification and frees up space at eye level. The room angle allows the supply louver to be oriented toward the center, creating a gentle sweep that avoids direct air currents on the occupants.
Clearances respected
The manufacturer's prescribed side and top clearances are observed to optimize maintenance and air circulation. The adjacent blind is taken into account to avoid any interference with the sensor and the flow directed along the window (generally a colder area in winter).
Refrigeration route, drilling and finishing
Direct wall crossing and short route
Choosing a direct wall feed-through behind the unit minimizes the length of refrigerant lines and reduces pressure losses and the risk of resonance noise . This strategy:
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shortens installation time,
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reduces the amount of refrigerant to be managed,
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facilitates future diagnostics in the event of maintenance.
Discreet capping and integration
Inside, the outlet is aligned for a clean appearance . Outside (not visible in the photo), we favor a facade-colored capping with a drip angle, in order to protect the insulation from UV rays and obtain the most sober visual signature possible.
Condensate management: reliability and silence
Drainage is carried out by gravity , which eliminates the need for a lifting pump and eliminates a potential noise source . The slope of the drain is checked over its entire course, and a service point is provided for periodic flushing, avoiding overflows in summer during peak humidity.
Power supply and compliance
The dedicated line from the electrical panel is sized according to the unit's nominal current, with an appropriate circuit breaker and an external circuit breaker near the condenser (RBQ standards and good HVAC practices). The communication and power cables between units are separated from the refrigerant lines to facilitate maintenance.
Commissioning: AirGreen method
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Nitrogen leak test and electronic detector control.
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High vacuum to < 500 microns and stabilization to ensure the absence of moisture.
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Functional checks in cold then in hot: intensity, overheating/subcooling, supply/return temperatures.
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Calibration of shutters , dehumidification settings and programming of eco modes to reduce consumption.
The result: a uniform temperature , low noise , and intuitive control for the user.
What this means for the customer
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Stable comfort in the living room, even during heat waves.
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Efficient supplementary heating during the off-season, reducing the use of electric baseboards.
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Optimized energy bill compared to an exclusively resistive heating system.
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Increased property value , the presence of a recent wall-mounted heat pump being an increasingly sought-after criterion in Montreal.
HVAC Maintenance: Keeping Your Zephyr Running at Its Best
Regular HVAC maintenance ensures longevity and performance:
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Cleaning the filters (every 4 to 8 weeks depending on use).
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Annual inspection : coils, ventilation wheel, condensate pan, connections, insulation of connections.
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External inspection : clearance around the condenser, fixings, condition of the capping.
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Update Wi-Fi remotes/controls if available, to optimize saving scenarios.
Pitfalls to avoid when installing a wall in an urban environment
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Oversize the capacity to “go faster”: the machine will cycle and lose real efficiency.
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Install too close to a curtain, blind or lintel , which diverts the flow and creates cold zones.
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Neglecting the slope of the drain : risk of runoff or algae in the tank.
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Forget about noise management : sealing of bushings, anti-vibration, and controlled line length prevent resonances.
Grants and Eligibility
High-performance wall-mounted heat pumps , such as the Zephyr , may be eligible for incentives in Quebec when efficiency and operating temperature criteria are met. We support our clients in documenting the evidence (AHRI number, technical data sheets) and submitting applications to maximize the assistance available in Greater Montreal (Montreal, Laval, Longueuil, North Shore , South Shore ).
Why entrust your HVAC installation to AirGreen?
At AirGreen , each project is prepared with a load study , a site plan and instrumented commissioning . Our approach:
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Listening to the need , choosing the right capacity and providing advice on the orientation of the shutters.
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Careful finishing : alignments, discreet cappings, clean seals.
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Follow-up : maintenance reminder, technical assistance, and responsive after-sales service .
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Local coverage : rapid interventions in Montreal, Laval, Longueuil, North Shore, South Shore .
Review of the Zephyr installation in Rosemont–La Petite-Patrie
The high-angle integration of the wall near the window optimizes air circulation and preserves aesthetics . The short paths and gravity evacuation improve reliability and limit wear points. The customer now benefits from a stable indoor climate , a better controlled bill , and a system ready to face Montreal winters as well as hot summers .
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).