Installation of a Sharp ZU1 wall-mounted heat pump in Sainte-Dorothée (Laval)
In Sainte-Dorothée (Laval), AirGreen installs a Sharp ZU1 wall-mounted heat pump : short cooling path, gravity evacuation, neat finishes and uniform comfort. HVAC service for Montreal, Laval, Longueuil, North Shore and South Shore.
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.
Consistent comfort and careful finishing in a renovated suburban home
At AirGreen , we have just completed the installation of a Sharp ZU1 wall-mounted heat pump in a family property in Sainte-Dorothée (Laval) . The project is part of a recently modernized ground floor: light partitions, recessed lighting, integrated furniture and circulation between the vestibule, kitchen and dining room. The client's objective was twofold: to stabilize the temperature of the open living area and to reduce electricity consumption during the heating and cooling seasons. The Sharp ZU1 (R-32) perfectly meets these specifications with its fine modulation and its silence at low speed.
Context of intervention and constraints of the place
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Space : central wall forming a circulation core, clear and ideal for transverse diffusion towards the entrance and the kitchen.
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Height : high installation, under the ceiling, leaving comfortable clearance for suction.
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Integration : wall thermostat and sockets nearby; technical cutouts provided for power supply and connection passage.
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Requirement : avoid unnecessary drilling, preserve aesthetics and allow rapid maintenance.
Why the Sharp ZU1 (R-32) series is a must-have in Greater Montreal
The Sharp ZU1 series is one of the new generation wall-mounted references to R-32 refrigerant , appreciated for its air conditioning performance and its resistance to Quebec cold.
Concrete highlights:
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Continuously modulated inverter compressor : the machine precisely adapts its power to actual needs, limiting cycles and lowering operating costs .
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Cold performance adapted to the greater Montreal area, with reliable heating during episodes of −20°C.
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Air quality : multi-layer filtration and regular airflow that prevents the sensation of drafts.
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Low noise level : the indoor unit remains discreet in living rooms, even in the evening.
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R-32 : better heat transfer and reduced environmental footprint compared to older fluids.
Typical capacities: 12,000 to 24,000 BTU for the ZU1 series, allowing the power to be precisely adapted to the thermal load of open living areas typical of homes in Laval and the North Shore .
Design and refrigeration path : short, clean and sustainable
Single drilling and gravity evacuation
The positioning of the interior head on an exterior wall allowed for direct rear drilling . The insulated copper connections open to the exterior with white capping to match the decor, then descend in a straight line towards the condenser. Condensate is drained by gravity , a preferred solution for its silence and long-term reliability.
Condenser and supports
The condenser (outside) is placed on galvanized wall brackets with anti-vibration pads . This approach:
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keep the device away from snow and dirt,
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promotes battery ventilation ,
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reduces vibration transmission to the structure — an advantage on lightweight facades.
Power supply and protections
We have provided a dedicated power supply with a suitable circuit breaker, an external service switch , and clearly marked cable routing. The refrigeration junctions are soldered and the insulation is UV -sheathed to prevent premature aging.
Air diffusion and settings: comfort felt throughout the living area
The unit, centered on the distribution wall , blows along the axis of the corridor towards the entrance and the kitchen. We adjust the orientation of the fins to:
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send air over the passage areas,
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avoid direct impact on seated occupants,
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promote a homogeneous mixture throughout the open area.
In cooling , the automatic speed maintains a low noise level; in heating , a slightly downward blowing angle limits stratification near the ceiling.
Sizing and savings: what makes the difference
Proper sizing (BTUs) in an open area avoids two pitfalls:
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Undersizing : machine at high speed, increased consumption and wear.
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Oversizing : short cycles, less efficient humidity management.
Our team calculates the thermal load based on orientation, insulation, glazing, and actual use. Combined with the modulation of the Sharp ZU1 , this choice results in:
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remarkable temperature stability ,
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smoothed consumption peaks ,
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and increased component longevity .
Finishing and maintenance: details that count
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Capping : white, aligned and without unnecessary bends ; stainless steel screws and weatherproof seals.
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Drainage : regular slope, drainage test carried out before delivery.
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Maintenance access : clearance maintained around the head for cleaning the filters and exchanger.
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Labeling : Clear identification of archived circuits and AHRI numbers for traceability and financial aid applications.
Grants and Eligibility
High-efficiency R-32 wall-mounted heat pumps are often eligible for provincial or federal assistance programs , subject to performance thresholds. Our team supports the Sainte-Dorothée client in:
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verification of technical criteria (AHRI combination number, SEER/HSPF levels),
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preparation of documents ,
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and the submission for Montreal, Laval , Longueuil , North Shore and South Shore .
Result for the customer: immediate comfort and peace of mind
Following commissioning and testing:
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the open area benefits from a uniform temperature ,
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the noise level remains very discreet on a daily basis,
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the aesthetics of the place are preserved thanks to a short route and clean finishes,
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the energy bill is controlled thanks to modulation and good sizing.
AirGreen Tips for Similar Rooms in Laval and Surrounding Areas
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Choose an exterior wall to minimize the length of connections and promote gravity drainage .
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Respect the clearances around the head (suction/blowing): avoid cupboards, wall returns and cornices that are too close.
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Clean filters every 4 to 8 weeks depending on dust and the presence of animals.
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Clear the condenser of snow and ice in winter to maintain heat pump performance.
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Plan annual maintenance : pressure check, cleaning of exchangers, checking of condensate tray and fixings.
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Program low speeds in the evening for an even quieter atmosphere and optimal performance.
Why entrust your project to AirGreen?
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Local expertise : hundreds of successful wall installations in Laval , Montreal and on both shores .
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Methodology : thermal study, precise positioning , aligned capping, compliant electrical protections.
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Complete support : choice of capacity, management of subsidies , usage advice, then HVAC maintenance .
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Recent range : we favor R-32 / R-454B models (Sharp, Fujitsu, Midea, Gree, etc.) for lasting compliance with current standards.
In summary
This Sharp ZU1 wall-mounted heat pump installation in Sainte-Dorothée (Laval) illustrates our approach: minimal path , gravity drainage , anti-vibration mounts, clean finishes and air settings designed for an open living space. The result is stable comfort all year round and energy efficiency aligned with the expectations of Greater Montreal homeowners.
How it goes, from the first call to the end
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 the unit delivers when it is cold
The range as published on airgreen.ca: pick a size to see its capacity in deep cold.
| Size | Heating at −8 °C | Heating at −15 °C | Coldest certified point | COP at −15 °C | SEER | HSPF | Indicative LogisVert aid |
|---|---|---|---|---|---|---|---|
| Sharp ZU1 12 000 | 14,500 | 12,000 | −27 °C: 7,200 | 2.11 | 22.0 | 11.0 | $1,740 |
| Sharp ZU1 15 000 | 18,100 | 15,300 | −27 °C: 10,100 | 2.1 | 24.0 | 11.0 | $2,172 |
| Sharp ZU1 18 000 | 22,000 | 18,000 | −27 °C: 11,500 | 2.2 | 24.0 | 11.0 | $2,640 |
| Sharp ZU1 24 000 | 22,400 | 19,000 | −27 °C: 12,300 | 2.2 | 22.0 | 11.0 | $2,688 |
According to NEEP, it delivers 14,500 BTU/h at −8 °C (17 °F), more than at 8 °C (14,000 BTU/h). It heats as hard in moderate cold as in mild weather.
According to NEEP, its certified maximum capacity at −27 °C (−17 °F) is 7,200 BTU/h, 60% of its nominal 12,000 BTU size.
At 8 °C, its certified maximum capacity reaches 17,100 BTU/h, 42% more than its nominal 12,000 BTU size.
According to NEEP, it delivers 18,100 BTU/h at −8 °C (17 °F), more than at 8 °C (18,000 BTU/h). It heats as hard in moderate cold as in mild weather.
According to NEEP, its certified maximum capacity at −27 °C (−17 °F) is 10,100 BTU/h, 67% of its nominal 15,000 BTU size.
At 8 °C, its certified maximum capacity reaches 21,800 BTU/h, 45% more than its nominal 15,000 BTU size.
According to NEEP, it delivers 22,000 BTU/h at −8 °C (17 °F), more than at 8 °C (21,600 BTU/h). It heats as hard in moderate cold as in mild weather.
According to NEEP, its COP at −27 °C is 1.88: the highest of the ZU1 line, which ranges from 1.79 to 1.82 at that temperature.
According to NEEP, its certified maximum capacity at −27 °C (−17 °F) is 11,500 BTU/h, 64% of its nominal 18,000 BTU size.
At −27 °C, its certified minimum capacity is 3,200 BTU/h (5,500 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 19,000 BTU/h, 79% of its nominal 24,000 BTU size. Its COP there is 2.20.
Data read live from the airgreen.ca page of each size (NEEP / AHRI certified performance). When the title names the installed size, it is highlighted; otherwise the whole range is shown. The aid shown is today’s, using Hydro-Québec’s rule ($120 per 1,000 BTU/h at −8 °C); amounts quoted in the article date from its publication. Only Hydro-Québec confirms the assistance granted.
And at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Baseboards and electric furnaces turn 1 kWh of electricity into 1 kWh of heat. A heat pump delivers more: that is its COP. At Hydro-Québec’s rate D (11.142¢/kWh above 40 kWh a day, since 1 April 2026):
Hydro-Québec: a heat pump can be up to three times more efficient than baseboards for heating in the colder months.
Estimate per kWh of heat, at the chosen temperature, using the certified COP from the product page. Taxes, access charge and backup heat not included.
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.
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.
Which type of equipment for your project?
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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).