Installation of a Sharp ZU1 series wall-mounted heat pump in Rosemont–La Petite-Patrie
Sharp ZU1 series wall-mounted heat pump installed by AirGreen in Rosemont–La Petite-Patrie: careful installation, gravity drain, fine adjustments and 4-season comfort. HVAC services in Montreal, Laval, Longueuil, North Shore and South Shore.
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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 precise and elegant upgrade for 4-season comfort in a Montreal apartment
At AirGreen , we have just completed the installation of a Sharp wall-mounted heat pump (ZU1 series, R-32 refrigerant) in a home in the Rosemont–La Petite-Patrie neighborhood. The objective was clear: to provide reliable heating in winter and controlled cooling in summer , while discreetly integrating the indoor unit into a newly renovated interior. This achievement highlights our expertise on urban HVAC projects where ergonomics, silence and finish are as important as performance.
Why a Sharp ZU1 series for this project?
We recommend the Sharp ZU1 series for its inverter technology , high energy efficiency , and low-temperature stability. The R-32 platform improves SEER/HSPF and reduces the environmental footprint compared to older R-410A systems. This range offers several power ratings (9k to 24k BTU) allowing for sizing to match actual room volume and insulation.
Advantages retained for the client:
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4-season comfort with fine power modulation.
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Quiet operation of the wall unit, essential in a Montreal apartment.
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Careful filtration and air quality , with laminar flow and precise shutters to avoid direct air currents.
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Simplified HVAC maintenance thanks to easily accessible filters.
Housing context and site constraints
The accommodation has light walls , standard ceilings and some work is underway to renovate it. The interior headboard had to be placed high up, close to a corner , to free up circulation space and ensure even distribution in the living area. We chose a location that allows for both:
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a dedicated electrical connection that complies with the code,
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a direct refrigerated route to the outside,
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gravity condensate drainage (prioritized for reliability and silence),
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sufficient maintenance clearance under and around the appliance.
Site preparation and installation methods
Our team secured the area (protecting the walls, floor and finishing elements) then:
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Locate the structure in order to align the plate on solid uprights;
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Checked the drilling pitch and sleeve orientation to obtain a continuous slope for the drain;
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Treated the waterproofing around the sleeve on the outside (vapor barrier and HVAC compatible caulking);
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Mounted with the inner head on a plate leveled to the millimeter for perfect condensate drainage;
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Insulated the connections and covered the interior path where visible, in a neutral finish matching the walls.
The high positioning, close to the ceiling, promotes the suction of hot air during cooling and reduced stratification in heating mode.
Refrigerant path and power supply
We have optimized the length of the insulated copper lines to limit losses and comply with manufacturer specifications . The communication/power cable follows the same route, under UV-resistant sheath on the outside. The protection on a dedicated circuit breaker and the proximity switch on the outside ensure safety and maintenance.
Key points:
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Respect the radii of curvature and tightening torques when mashing.
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Nitrogen proof and deep vacuum draw to stability, for a clean and long-lasting charge.
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Check for micro-leaks before releasing the refrigerant and switching on.
Condensate management: reliability without a pump
The housing architecture allows for a gravity drain — the quietest and most robust solution. We ensured:
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a regular slope (> 2%) from the internal tank;
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a tube section adapted to avoid water retention;
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a protected and discreet exterior exit , far from any passageway.
When gravity is not possible, we integrate a lifting pump with an inspection hatch. Here, the gravity option was preferred for zero active maintenance and minimal risk .
Commissioning and fine-tuning
After the electrical and refrigeration checks, we carried out:
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Self-test and verification of card parameters ;
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Temperature measurements (supply/return) and compressor intensity ;
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Adjustment of the shutters for a horizontal sweep covering the living area without blowing directly on the occupant;
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Setting eco modes and automatic recovery in the event of a power outage.
The result: stable blowing , rapid comfort and very low noise levels – ideal for everyday life.
Aesthetic integration and ergonomics
The Sharp head is flush with the ceiling , in a matte white shade that blends into the decor . Visible covers are kept to a minimum and aligned to maintain clean lines. The front clearance makes it easy to remove filters for maintenance.
Expected performance and savings
Thanks to inverter modulation and room- specific sizing , the system allows:
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significant energy savings compared to electric convectors;
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consistent comfort with limited temperature variations;
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a reduction in perceived noise , day and night.
In a typical Montreal apartment, the combination of good insulation and a wall-mounted heat pump often makes it possible to lower the heating bill while adding an efficient wall-mounted air conditioner in the summer.
HVAC Maintenance: What We Recommend
To maintain longevity and performance:
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Clean filters every 4 to 8 weeks during periods of heavy use;
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Annual inspection by an AirGreen technician (pressure, connections, vacuum gauge, condensates);
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External clearance of the condenser (winter/summer) and demisting of the grille in the cold season.
These simple actions maintain seasonal performance and prevent breakdowns.
Pitfalls to avoid when installing a wall mount
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Install too high without lateral clearance for service: we keep a technical space to intervene.
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Drain without slope or multiple bends: risk of stagnant water; we favor wide curves .
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Lines too long without factory oversizing : we optimize the distance and respect the manufacturer's tolerances.
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Leaky hole: we seal to prevent air and moisture infiltration.
Grants and Eligibility
High-efficiency wall-mounted heat pumps with R-32 refrigerant are generally eligible for financial assistance depending on the configuration and performance of the unit. We assist our clients in Montreal, Laval, Longueuil, the North Shore, and the South Shore in preparing their files (proof of installation, performance parameters, detailed invoices).
Why AirGreen for your installation in Montreal and surrounding areas?
Our team is familiar with the typical configurations of apartments and plexes in Greater Montreal: narrow passageways , flat roofs , narrow backyards , balconies and co-ownership deadlines. We provide:
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accurate surveys and weighted sizing ;
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clean and rapid execution , coordinated with other trades;
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post-installation follow-up (maintenance, filter reminders, optimization).
Conclusion
This Sharp wall-mounted heat pump installation (ZU1 series) in Rosemont–La Petite-Patrie illustrates an approach where performance , silence and finish meet. The home now benefits from stable heating in winter and flexible cooling in summer , with a discreet indoor unit that respects the aesthetics of the renovations. For any HVAC installation project in Montreal, Laval, Longueuil, North Shore or South Shore , our team designs tailor-made solutions that combine energy savings and lasting comfort .
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).