Installation of a Sharp (ZU1 series) wall-mounted heat pump in Rosemont–La Petite-Patrie
AirGreen installs a Sharp wall-mounted heat pump (ZU1 series) in Rosemont–La Petite-Patrie. Careful, quiet and efficient condo installation. HVAC installation and maintenance in 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.
A residential project that focuses on silence, precision and impeccable finishes
At AirGreen , we advocate a simple approach: in an urban home, a wall-mounted heat pump must be invisible while providing consistent comfort. This project in Rosemont–La Petite-Patrie illustrates this requirement. Our client wanted a four-season solution that would be discreet on a daily basis and perfectly integrated into their living room, which was equipped with a wall-mounted TV. We recommended a Sharp wall-mounted unit (ZU1 series) , known for its fine modulation, low noise level, and reliability in Montreal's climate.
Context: dedicated multimedia wall and low ceiling
The installation area is a central wall housing the main screen of the dwelling. The ceiling is relatively low, typical of recently built condos, with light paint. The indoor unit was positioned high on the wall , above the line of sight, in order to clear the living space and maintain free airflow above the TV stand. This configuration requires special attention to clearances , diffusion without recirculation near the ceiling and silent vibration management .
Why Sharp (ZU1 series): stability, comfort and savings
Sharp wall systems are distinguished by responsive inverter electronics and high-performance heat exchangers. In a condo living room, this translates into gradual power variations: the machine reaches the required temperature quickly, then maintains a low, economical and almost inaudible speed.
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Device type: single-zone wall-mounted heat pump
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Recommended capacity range based on load calculation: 9,000 to 12,000 BTU/h
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Technology: Inverter compressor, precise regulation
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High efficiencies (SEER/HSPF) and Energy Star compatible depending on configuration
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Acoustics: low sound levels at low speeds and night mode
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Comfort: wide air sweep, effective dehumidification in mid-season
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Connectivity: Wi-Fi control options and weekly schedules
Study of the route and layout: air quality and finish above all
1) Positioning of the inner head
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Height : mounting in the upper part, centered on the axis of the media wall for a clean visual rendering and homogeneous diffusion .
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Clearances : Respect the lateral and upper distances prescribed by the manufacturer in order to avoid self-aspiration and dead zones near the ceiling.
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Fixing : Laser aligned back plate ; check the flatness of the support to eliminate any whistling or parasitic vibration .
2) Wiring, refrigerant connections and drilling
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Short routing behind the unit to preserve the aesthetics of the TV wall; insulated copper connections with controlled bending radii to protect the inverter compressor.
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Single hole through the envelope, sleeved then sealed (air barrier/vapor barrier and UV-resistant exterior sealant) to maintain the watertightness of the facade.
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Minimal and straight capping when visible, screws with regular threads; light color to match the walls for a discreet look.
3) Drainage of condensates
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Priority to gravity : continuous slope to the evacuation point, with odor trap if necessary.
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Alternative : ultra-quiet mini-lift pump when gravity outlet is not possible (interior wall, reverse route). Mounting on silent blocks , transparent vinyl pipe accessible for maintenance, and alarm contact to cut off the device in the event of obstruction.
4) Power supply and communication
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Dedicated circuit conforming to the rating indicated by the manufacturer, differential circuit breaker if necessary depending on the building configuration.
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Communication cable carefully stapled and protected to prevent interference and maintain the integrity of control signals.
5) Outdoor unit: performance and neighborhood preserved
Depending on the layout of the condominium, the outdoor unit is placed on the balcony or on the ground :
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Support : low frame with anti-vibration pads , or raised slab to clear snow and ensure drainage in defrosting mode.
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Clearances : strict compliance with suction/discharge clearances to maintain actual capacity in hot and cold weather.
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Nuisances : blowing direction and night mode programmed to limit noise impact during quiet periods.
AirGreen Site Challenges and Technical Responses
Media wall: avoid direct airflow onto occupants
Positioning above the TV allows for sweeping over the seating area. The vanes have a gentle tilt adjustment; automatic fan speed reduces drafts in cooling mode.
Low ceiling: risk of recirculation and stratification
Our team checks the upper clearances and recommends a slightly inclined airflow setting to prevent warm air from looping in winter. The goal: uniform perceived heat between the floor and ceiling.
Interior aesthetics: invisible cables, straight lines
In a living room, every detail counts. The caps are installed precisely , with clean corner returns. The holes are deburred and painted if necessary to ensure the installation blends in with the decor.
Commissioning methodology (AirGreen signature)
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Simplified load calculation and verification of contributions (glazing, orientation, occupants).
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Laser implantation of the plate; control of clearances and leveling .
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Nitrogen brazing or flared fittings tightened to the prescribed torque ; protection of insulation at friction points.
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Nitrogen test and deep vacuum (< 500 microns) until stabilization; check of the rise.
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Additional charge to the nearest gram according to the actual length; gas filling and electronic leak detection.
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Functional tests : cooling/heating modes, dehumidification, sensor calibration, ΔT measurement and subcooling/superheating control.
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User settings : explanation of modes, clock, night mode , and tips for HVAC maintenance .
Results: four-season comfort and bill under control
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In summer , the device operates at low speed most of the time: the room remains cool, without sudden starts or noticeable noise during films.
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In mid-season , the Dry mode stabilizes humidity, ideal for a living room used intensively.
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In winter , the heat pump supports the main heating: tangible energy savings, particularly during thaws.
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In everyday life, the whole thing disappears visually , leaving room for the media wall and comfort.
Recommended maintenance to maintain yields
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Filters : rinse every 4 to 8 weeks during use; dry completely before replacing.
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Annual cleaning by our technicians: exchanger, turbine, tank and drain (or pump), tightening of connections, refrigeration and acoustic check.
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Hygiene : gentle anti-biofilm treatment if odors persist.
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Winterization : clearing the outdoor unit, checking the pads and the defrost path.
Rigorous HVAC maintenance maintains efficiency, extends compressor life and reduces consumption .
Practical advice for condominiums in Montreal, Laval, Longueuil, North Shore and South Shore
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Building regulations : authorization for the location of the outdoor unit, color of the capping, work schedule.
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Openings : requirement for air and vapor barrier sealing to maintain the energy efficiency of the envelope.
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Noise : aim for a perceived level < 45 dB(A) at the nearest reception point; discharge orientation and anti-vibration pads.
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Grants : Several Energy Star certified wall-mounted heat pumps provide access to assistance according to current programs; our team supports the customer in eligibility and the file.
What our customers appreciate about AirGreen
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Careful reading of the site before any intervention.
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Careful finishing : alignments, simple cappings, waterproof seals.
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Refrigeration rigor : deep vacuum, torque and load control.
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Local monitoring : HVAC maintenance , diagnostics and repairs throughout Greater Montreal .
Short fair
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Is the Sharp ZU1 series suitable for an open living room? Yes, its modulation and wide sweep are suitable for living rooms; the BTU capacity is validated by calculation.
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Is a lifting pump mandatory? No, if a gravity drain is possible; otherwise, we install a quiet and accessible mini-pump.
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Installation time? In condos, most installations are completed in one day , including testing and commissioning.
Conclusion
This HVAC installation in Rosemont–La Petite-Patrie demonstrates the benefits of a Sharp wall-mounted heat pump (ZU1 series) intelligently placed above a media wall: silence , sobriety , savings and comfort felt in summer and winter. At AirGreen, we combine implementation design, technical rigor and local service in Montreal, Laval, Longueuil, North Shore and South Shore .
Areas served: Greater Montreal — rapid interventions for heat pumps , wall-mounted air conditioners , HVAC maintenance and modernization of residential installations.
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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Four mistakes we do not make
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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).