Installation of a Sharp ZU1 wall-mounted heat pump in Le Sud-Ouest (Montreal)
In Le Sud-Ouest, AirGreen is installing a Sharp ZU1 on a brick façade: wall brackets, brown capping, exterior disconnect, and extreme cold performance. A meticulous HVAC installation for lasting comfort throughout Greater Montreal.
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The job on one screen
The unit’s data sheet
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.
The article, chapter by chapter
An exemplary exterior installation on a brick facade for four-season comfort
In the Southwest , a Montreal area of brick plexes and narrow alleys, we carried out the complete installation of a Sharp ZU1 wall-mounted heat pump . The project combines energy efficiency , discreet integration and reliability in extreme cold , with the highlight of an exterior installation on wall brackets and a brown-colored covered path perfectly aligned with the architecture.
Client context and objectives
The owner of a duplex wanted:
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air-condition the main floor in the summer and support heating in the winter;
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reduce your energy bill by limiting the use of electric baseboards;
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preserve the aesthetics of the courtyard and the circulation near the side door.
After a site survey and thermal assessment, we confirmed the suitability of a Sharp ZU1 (R-32 refrigerant) , a residential range that performs well in extreme cold and is known for its silence and power stability . The chosen capacity falls within the usual ranges for a Montreal home (typical configuration 12–18 k BTU depending on needs and zoning).
Why the Sharp ZU1 for a Montreal plex
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Inverter compressor : fine modulation, stable comfort and tangible savings.
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Low temperature performance : capacity maintenance down to approximately −25°C , suitable for Greater Montreal winters.
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R-32 refrigerant : lower global warming potential than the old R-410A.
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Air quality : Advanced filtration and Sharp's own Plasmacluster ion treatment.
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Controlled acoustics : low noise level to preserve the tranquility of the backyard.
Exterior installation: neat, robust, durable
We mounted the Sharp condenser on galvanized wall brackets above the concrete base. This solution:
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keeps the unit out of the snow and splash zone ;
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limits vibrations (anti-vibration pads and tightening adjusted to the torque);
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ensures clearances consistent with maintenance and airflow.
The brown vertical capping runs from the condenser to the top of the facade, to join the emergence of the refrigerant connections towards the interior. This shade harmonizes with the red brick and the black frames, for a sober and discreet result. The exterior disconnect box , waterproof and clearly identified, is located within direct reach for safety and maintenance . The power wiring follows a short and protected route, with approved conduits and mechanical fixing at the load-bearing points.
Technical details visible on the facade
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Wall brackets with center distance suitable for Sharp frames, stainless steel bolts and sealing suitable for brick cladding.
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Height of approximately 1 m above the finished ground for snow and ice removal.
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Continuous vertical capping (brown color) limiting visual impact and protecting the insulation from UV rays and bad weather.
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Disconnect exterior and standard conduit to the junction box.
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Sufficient lateral clearance from windows and the fence for air intake and discharge.
Route of connections and management of condensates
The indoor station is located on the upper floor; we have opted for a vertical route covered on the facade then crossing at the top, to reduce bends and optimize pressure losses . Given the difference in level and the interior configuration, condensate management is ensured by a silent lifting pump integrated near the head, with a dedicated discharge line and non-return valve. This approach avoids visible gutters on the facade and guarantees reliable flow at all times.
Key Steps in HVAC Installation
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Study and tracing : validation of clearances, choice of height, structural identification of the masonry.
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Controlled drilling : coring with adequate slope, sleeve and peripheral sealing .
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Fixing the brackets and installing the condenser, installing the anti-vibration devices .
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Drawing of connections (fridge + communication + power supply), careful insulation, riveted capping.
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Soldering/crimping according to Sharp specifications, nitrogen priming , deep vacuum < 500 microns.
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Fluid opening , leak test and functional tests (pressure/temperature, intensity, delta T).
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Commissioning : remote control calibration, programming, HVAC usage and maintenance advice.
Result: immediate comfort and contained noise
Upon switching on, the interior head ensures uniform sweeping of the living area. The condenser, firmly anchored, remains very discreet acoustically for the neighborhood and the adjacent terrace. The inverter regulation limits short cycles , guaranteeing durability and savings.
AirGreen Recommended HVAC Maintenance
To preserve seasonal yield:
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Clean/vacuum filters every 4-8 weeks during peak periods.
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Rinse the outdoor battery with a gentle jet in spring and fall.
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Annual inspection : refrigerant check, electrical tightening, condensate test, cleaning of exchangers.
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Winter clearance : keep a clear space around the condenser (snow and ice); if necessary, provide a snow guard on the roof if there is a risk of falls.
Tips for living in a Montreal duplex
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In heating mode, set a moderate setting and let the inverter work continuously to stabilize the temperature.
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Use the sweep to push air into the hallway and adjacent rooms.
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Schedule a nighttime hold rather than complete shutdowns to avoid energy-consuming restarts in very cold weather.
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Combine the heat pump with sealing practices (door weatherstripping, window seals) to maximize gains.
Grants and Eligibility
The Sharp ZU1 (R-32) range is one of the energy-efficient solutions usually eligible for assistance programs offered to homeowners in Quebec. We support our clients in preparing the file , estimating annual savings and validating criteria (performance, cold climate, certification). Residents of Montreal, Laval, Longueuil, North Shore and South Shore benefit from a complete service : advice, installation, documents and follow-up.
Pitfalls to avoid when installing exterior brickwork on a facade
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Undersizing the capacity: risk of full draw, wear and discomfort. We carry out sizing based on the envelope and actual usage.
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Ignore clearances : airflow obstruction, frost, and noise. Our templates ensure compliance.
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Unprotected path : UV rays and bad weather damage the insulation. Capping provides a lasting solution to this problem.
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No disconnect : non-compliance and difficult maintenance. We systematically integrate an external service switch .
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Improvised condensate management : potential infiltration. The lifting pump and dedicated line secure the evacuation.
What this installation says about our AirGreen method
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Adaptation to Montreal buildings : masonry, openings, circulation in the backyard.
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Finishes : hood alignment, consistent color, invisible anchors once closed.
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Measurable performance : immediate delta T, blower stability, controlled electrical consumption .
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Service : a single point of contact, from the technical visit to commissioning and initial maintenance.
Conclusion
This Sharp ZU1 wall-mounted heat pump installed in Le Sud-Ouest illustrates our requirement: a precise, aesthetic HVAC installation designed to last. Between energy savings , constant comfort and impeccable integration on a brick facade, the result meets exactly the expectations of Montreal homeowners. For similar projects in Montreal, Laval, Longueuil, on the North Shore or the South Shore , our team delivers the same level of quality , with clear support on subsidies and maintenance to ensure a profitable investment in the long term.
The job tools
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.
How the job unfolds
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 we check on a job like this one
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.
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.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
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.
The right pages, at the right time
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).