Installation of a Sharp (ZU1 range) wall-mounted heat pump in Rosemont–La Petite-Patrie
Sharp wall-mounted heat pump (ZU1 series, R-32) installed by AirGreen in Rosemont. Short path, UV duct, exterior disconnection, and controlled vibrations for four-season 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
A recent Sharp heat pump, precisely installed on wall brackets, for 4-season comfort in an urban environment
At AirGreen , we have just completed the installation of a Sharp wall-mounted heat pump (ZU1 range, R-32 refrigerant) on a typical Rosemont–La Petite-Patrie plex. The building features mixed dark wood and brick cladding, a narrow balcony, and limited clearance around the openings. Our mandate: to provide stable , energy-efficient comfort while respecting the constraints of a dense urban environment, without encroaching on living space or traffic.
Site context and client objectives
The client wanted:
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reliable heating until very cold and regular cooling in summer;
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a very low noise level on the alley and interior side;
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a clean and durable installation that does not alter the coating and remains easy to maintain;
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administrative preparation for possible eligibility for energy efficiency programs in Quebec .
We recommend the Sharp – ZU1 range in R-32 wall-mounted for its excellent performance/consumption ratio in Montreal's climate, its stable inverter technology and its very robust electronics.
Technical choice: Sharp (ZU1 range) R-32
The Sharp ZU1 family (12k to 24k BTU versions) is distinguished by:
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high seasonal efficiency with wide modulation range inverter compressor;
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winter operation optimized for the climate of Montreal, Laval, Longueuil, North Shore and South Shore ;
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very low exterior acoustics, appreciable in alleyways and on balconies;
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the use of R-32 refrigerant , with a lower GWP than R-410A, contributing to a reduced environmental footprint.
Sizing: After surveying the main rooms and the envelope, the 12,000–15,000 BTU range was found to be relevant for the apartment served. This sizing limits short cycles, improves comfort and reduces consumption .
Installation: millimeter precision on wall brackets
We mounted the outdoor unit on galvanized steel brackets at a safe height above a window. This installation:
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frees up the balcony floor and traffic;
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keeps the device away from snow accumulations and debris;
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optimizes rear and side clearances for condenser ventilation .
High-density silent blocks separate the unit from the structure to attenuate vibrations . The anchors are sized for the dynamic load and freeze/thaw stresses typical of Rosemont.
Refrigerant connections and power supply: short, protected and readable route
The route of the connections follows a black UV technical sheath which joins an external disconnection box . The choices made:
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Short line length (approximately 2–3 m visible), limiting pressure losses and promoting efficiency.
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Curve radii respected , with service loop for maintenance.
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UV and thermal resistant sheath and sealing tape .
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Disconnect box within the regulatory range of the device for electrical safety and maintenance operations.
Inside, the wall-mounted head has been positioned to circulate useful air without direct air currents on the living areas; condensate drainage is by gravity, with a continuous slope, which reduces maintenance and the risk of overflow.
Sealing and protection of the envelope
Each drilling received:
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doweling suitable for mixed support (wood/brick);
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high performance elastomeric sealant and weatherstripping sleeve ;
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final visual inspection of air and water tightness .
On the facade, the technical duct follows the existing joints and edges to remain discreet and avoid water traps.
Commissioning: AirGreen rigor
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Nitrogen test and pressure maintenance to validate the tightness of the circuit.
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Deep vacuum with digital vacuum gauge (target value reached and hold checked).
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Opening the fluid and reading the parameters (pressures, superheating/subcooling, intensity).
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Acoustic measurements and vibration control on different bearings of the Inverter.
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User settings : instructions, modes, speeds, frost prevention.
Result: stable start , rapid modulation, homogeneous blowing in the target area.
What the customer gains, starting today
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4-season comfort : consistent warmth in winter, gentle, smooth coolness in summer.
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Lower bill compared to electric baseboards alone.
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Sound discretion thanks to silent blocks and the Inverter algorithm.
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Simplified maintenance : easy access to the unit, legible sheath, disconnection within reach.
Grants and Compliance
Recent R-32 wall-mounted heat pumps like the Sharp ZU1 series are generally eligible for incentives when heating performance criteria are met. We support our clients in Montreal, Laval, Longueuil, the North Shore, and the South Shore in:
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eligibility verification (power, efficiency, test temperatures);
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preparation of evidence (technical sheets, photos, invoices);
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submission of files after commissioning.
Salient installation details (construction site side)
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Reinforced wall brackets with silent blocks ;
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Black UV resistant sheath/capping , short and clean run ;
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Compliant, identified external disconnection box ;
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Controlled height above an opening, respecting clearances;
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No damage to balcony joists; single sealed drilling;
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Condensate drainage test and usage advice (Dry mode, defrosting).
AirGreen Best Practices for Rosemont Plexes
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Always raise or detach the outdoor unit to avoid transmitting vibrations to living areas.
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Favor short routes for the lineset: better efficiency, fewer joints.
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Secure the power supply with a dedicated disconnect device .
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In winter, clear the outdoor unit of snow/ice and keep the grilles clean .
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Annual HVAC maintenance : cleaning of the evaporator, condenser, checking of tightenings and settings.
What makes the AirGreen difference
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Custom planning for dense buildings in Greater Montreal;
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Careful execution and instrumented controls at each stage;
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After-sales support : maintenance, original parts, usage advice;
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Rapid intervention in Montreal, Laval, Longueuil, North Shore, South Shore .
Conclusion
This Sharp wall-mounted heat pump installation (ZU1 series) in Rosemont–La Petite-Patrie illustrates our approach: applied engineering , clean finishes, high efficiency and lasting comfort . For an HVAC installation project or HVAC maintenance in Greater Montreal, AirGreen offers reliable, quiet and efficient solutions, adapted to the realities of Montreal plexes as well as single-family homes.
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).