Installation of a Sharp wall-mounted heat pump in Rosemont–La Petite-Patrie
AirGreen installs a Sharp wall-mounted heat pump in Rosemont–La Petite-Patrie: positioning under cornice, white capping, gravity drainage and complete commissioning for quiet and energy-efficient HVAC comfort.
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 carefully integrated into an interior with Montreal character
At AirGreen , we work in many older plexes and condos in Greater Montreal where moldings, decorative lighting, and load-bearing walls require precise execution. This installation in Rosemont–La Petite-Patrie illustrates our approach: a Sharp wall-mounted heat pump installed under a textured cornice, near a wall-mounted light fixture, with a discreet appearance and measurable performance from the moment it is commissioned.
Housing context and client objectives
The owner wanted:
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Stabilize the temperature of a southwest-facing living room, which is prone to overheating in summer and nighttime heat loss in winter.
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Reduce energy bills without increasing ambient noise.
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Preserve the aesthetics of a room dressed with original frames and moldings.
We recommended a Sharp wall-mounted heat pump (typical capacity of 9,000 to 12,000 BTUs for this volume), a versatile solution for mid-season supplemental heating and summer cooling, while remaining energy-efficient and quiet.
Choosing a location: airflow and aesthetics
The indoor unit is placed high on the wall , away from the cornice to avoid any recirculation of hot air to the ceiling. Our placement criteria:
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Upper and lateral clearance respected for free suction and even diffusion towards the center of the room.
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Move away from sources of interference (curtains, bulky frames, hot lamps which distort the temperature reading).
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Height optimized for gravity drainage of condensates, avoiding the addition of a pump and limiting maintenance.
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Blowing axis oriented so as to sweep the living area, without directing the flow directly onto the sofa.
The adjacent wall light required precise centering : we validated the opening of the shutters, access to the casing and the freedom of the thermistor sensor to guarantee faithful regulation.
Routing connections: treating the invisible
The installation is carried out in a back-to-back manner towards an exterior facade. We group together:
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Insulated refrigeration tubes in HVAC class,
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Certified communication/power cable ,
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Continuously sloping condensate pipe .
Inside, a minimalist white capping accompanies the outlet towards the wall, then extends outside to protect the connections from UV rays , shocks and frost. Outside (not visible here), the condensing unit is mounted on wall brackets clear of the ground to promote water flow and limit snow accumulation, a crucial point in Montreal winters .
Technical particularities and precautions on this site
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Moldings and textured ceiling : laser tracing to maintain lines perfectly parallel to the cornices; dowels adapted to the material; clean sealing of the drilling.
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Decorative frames : air shedding control to avoid dead zones behind the paintings; low-speed vibration check to avoid transmitting hums to the wall.
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Noise pollution : setting nighttime silent mode; checking desuperheating in air conditioning mode to prevent expansion whistling.
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Condensates : slope > 1% guaranteed, service siphon and outlet outside the passage area to avoid any splashing on the masonry.
Why the Sharp wall-mounted heat pump is suitable for Rosemont
The Sharp wall series are distinguished by:
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High efficiencies (SEER/HSPF) and precise compressor speed control for stable comfort.
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Quiet operation , ideal for living rooms and bedrooms.
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Efficient heating at low temperatures (down to approx. -20 to -25°C depending on the range), relevant for the North Shore , Laval and the heart of Montreal .
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Advanced filtration and evaporator surface treatment limiting dust and humidity.
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Compatibility with grant programs when the configuration meets Energy Star criteria and minimum heating performance.
Installation steps followed by AirGreen
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Load calculation and validation of BTU capacity for the main room.
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Identification/prototyping : position, drilling template, routing of connections and condensate discharge point.
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Fixing the wall plate with suitable anchors; checking the flatness to avoid flow noises.
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Through drilling at a downward angle; deburring the sheath; application of a vapor barrier .
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Installation of the Sharp indoor unit , testing of the shutters and the oscillation.
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Brazing/Torque-controlled flare fittings ; nitrogen priming , deep vacuum and leak testing .
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Electrical connection on dedicated circuit breaker in accordance with the Code ; circuit labeling.
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Commissioning : supply/return temperature measurements, superheat/subcooling, compressor intensity, vibration control.
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Delivery to the customer : operating instructions, seasonal adjustments, HVAC maintenance schedule.
Result: performance, silence and integration
The room quickly reaches the setpoint, without unpleasant drafts. The noise level remains low, even under load, and the visual integration respects the alignment of the moldings and frames. The uniform diffusion limits temperature strata, a point often criticized in apartments with high ceilings.
Advice on use and maintenance from our technicians
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Filters : clean every 4 to 8 weeks during periods of intensive use.
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Fins : Gentle dusting; do not obstruct the front face with oversized drapes or frames.
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Heating mode : in very cold weather, leave the appliance running continuously to maintain compressor stability.
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Remote control/thermostat : avoid direct sunlight which distorts the reading; activate eco programs at night.
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Annual HVAC maintenance visit: check pressures, residual vacuum, drain, and clean the evaporator/condenser.
What AirGreen brings more
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Certified team accustomed to the constraints of Montreal plexes (load-bearing walls, brick joints, cornices).
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Clean finishes (adjusted capping, watertight seals, perfect level).
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Support for subsidies for Montreal, Laval , Longueuil , North Shore and South Shore when the device and configuration are eligible.
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Responsive after-sales service , with fast parts and diagnostics on the brands we install.
Need a careful HVAC installation in Greater Montreal?
We install wall-mounted heat pumps , wall-mounted air conditioners , and multi-zone systems, with an approach focused on customer service, technical precision, and sustainability. For projects in Montreal, Laval, Longueuil, the North Shore , or the South Shore , AirGreen guides you from sizing to grants, then ensures clear and predictable 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).