Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
In Rosemont–La Petite-Patrie, AirGreen is installing a Sharp ZU1 (R-32) wall-mounted heat pump : high interior head, short cooling path, gravity evacuation, and meticulous finishes. A quiet and durable HVAC system for four-season comfort.
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.
Discreet comfort, measurable efficiency and careful finishing: in this typical Rosemont–La Petite-Patrie home, we have integrated a Sharp ZU1 series wall-mounted heat pump to provide summer air conditioning and off-season heating, while preserving the aesthetics of the living room and the tranquility of the occupants.
A project designed for a bright and compact Montreal apartment
The living room features a double window facing the street, a cast iron radiator in the sill, period moldings and a decorative shelf. The challenge is clear: to provide an efficient HVAC system without cluttering the space or hindering natural light. The high position, close to the outside corner, allows for even air distribution and a short refrigeration path to the outdoor unit, reducing losses and facilitating HVAC maintenance .
The client's objectives
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Stable freshness in summer, even during Montreal heat waves.
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Additional heat in spring and autumn to delay the start-up of the central heating (existing radiator).
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Silence and visual sobriety : the device must fit into the decor without dominating the room.
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Scalability : possibility of adding a second head in the medium term if a room needs it.
Equipment choice: Sharp ZU1 (R-32), the balance between compactness and efficiency
The Sharp ZU1 series offers a good compromise between size, reliability and efficiency in both air conditioning and heating in cool weather. Depending on the calculated heat load, we retain a typical capacity of 12,000 to 15,000 BTU , suitable for the common living areas of Montreal plexes. The R-32 refrigerant contributes to better volumetric efficiency and a reduced environmental footprint compared to older generations.
Major advantages of the ZU1 range:
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Fine modulation of the inverter to avoid short cycles and maintain humidity at a comfortable level in summer.
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Low noise level at low speed, ideal for evenings or nights.
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Easy-access filtration for simplified residential maintenance.
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Mid-season cold weather compatibility : useful in spring/autumn to relieve the main system and reduce the bill.
About grants: Many wall-mounted heat pumps are eligible when cold weather performance and Energy Star criteria are met. We always validate the eligibility of the installed model and support the process for Montreal , Laval , Longueuil , the North Shore and the South Shore .
Installation details — precision and finishes that make the difference
Implantation of the inner head
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Optimized ceiling height : the air intake remains clear, the air stream does not hit any shelf or molding.
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Clearance to walls respected: the shutters can direct the flow without creating recirculation near the window.
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Fixing on solid panel : metal anchors in the support, plate perfectly level to prevent any vibration.
Short and discreet refrigeration path
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Direct outlet to the outside through the side wall: estimated length 2 to 4 m to the condenser. A short route means less pressure losses, no (or little) addition of refrigerant to the factory charge and better responsiveness.
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White capping matching the walls for a neat visual integration. The insulation is continuous and UV protected , eliminating condensation in summer and thermal bridges in winter.
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Bending radius respected: reliability of connections and lifespan of brazing.
Gravity condensate management
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Controlled slope from the inner head tank to the outer outlet. A non-return siphon prevents odors, the outlet is protected from facade splashes.
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In case of slope constraints in other rooms, we provide silent condensate pumps ; here, gravity is sufficient, which simplifies maintenance.
Power supply and safety
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Dedicated circuit from panel, rating and breaker conform to Sharp nameplate.
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External disconnection placed near the condenser for intervention safety.
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Grounding verified and torque-controlled tightening: reliability without surprises.
Commissioning and quality controls
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Nitrogen test and leak test on all joints.
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Deep vacuum (< 500 microns) followed by a rise test to ensure the absence of humidity.
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Functional checks : compressor intensity, supply/return temperatures, subcooling/overheating, calibration of speeds and flaps.
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Comfort settings : mode programming, night setting, automatic switching and usage advice for the customer.
Aesthetic and acoustic integration in a living room
In this type of living room, the priority is not to dominate the space . The Sharp ZU1 head, with its sleek design, matches the moldings and window joinery. The noise level at low speed blends in with the ambient noise, and the orientation of the shutters avoids direct blowing on the sofa or reading corner. The radiator in place remains useful for continuous extreme cold; the heat pump, however, significantly reduces operating hours and improves comfort in mid-season.
Concrete results for the client
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Immediate comfort : even distribution, fewer layers of heat near the ceiling, better control of summer humidity.
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Energy savings : the inverter adjusts power to demand; in the off-season, the heat pump covers most of the needs.
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Silence : stable wall structure, balanced fan and anti-vibration on the condenser (outside) limit any resonance.
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Simplified HVAC maintenance : washable filters, clear access, quick annual inspection.
Deadlines, coordination and constraints resolved
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Typical duration : one day for this format — tracing, drilling, installation, refrigeration, electricity, vacuum and start-up.
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Access : protection of traffic, occasional tarpaulin for drilling dust, careful restoration.
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Facade constraint : compact and discreet wall crossing on the street/backyard side; choice of an exit point that limits visibility from the outside.
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Seasonality : Mounting is designed for snow and ice; clearances around the condenser, orientation that prevents air recirculation in defrost mode.
Practical tips for maximizing performance
Daily use
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Stable setpoints : Avoid yo-yoing with temperature. A constant setpoint stimulates modulation and reduces consumption.
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“Dry” mode in summer during humid periods for rapid comfort without overcooling.
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Clean filters every 4 to 8 weeks depending on dust and the presence of animals.
Annual preventive maintenance
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Cleaning of the internal exchanger , fan control, gentle disinfection of the condensate tray.
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Washing the outdoor condenser (spring), checking the tightening and insulation, reading the refrigeration parameters.
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Update settings (shutters, favorite speeds, programming) based on household habits.
Mistakes to avoid
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Undersizing : A 9,000 BTU that is too small will run at full speed and make noise. We size the capacity based on a load calculation.
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Obstruction of air intake by curtains, high shelves or rods. Keep a clear space around the head.
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Condensates without slope : gravity must be ensured or replaced by a suitable pump; otherwise, there is a risk of overflow.
Why entrust your project to AirGreen?
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Local expertise : hundreds of installations in plexes, condos and houses throughout Greater Montreal .
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Expertise in flat roofs and Montreal facades : short refrigerated paths, waterproof finishes, supports adapted to the climate.
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Administrative support : validation of eligibility for aid and complete documentation for Montreal , Laval , Longueuil , the North Shore and the South Shore .
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Attentive after-sales service : HVAC maintenance contracts to maintain the machine's performance and longevity.
What if you plan other rooms?
The solution is scalable . A room can receive a second head connected to the same outdoor unit (depending on configuration), or an additional dedicated device. We also offer Wi-Fi control options, home automation integration, and advanced filters to improve air quality.
Summary sheet — Installation in Rosemont–La Petite-Patrie
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Type : Sharp ZU1 wall-mounted heat pump (R-32), 12–15 kBTU depending on load.
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Layout : high interior head, unobstructed airflow, short refrigeration path to the exterior.
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Condensates : gravity drainage with controlled slope and siphon.
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Electrical : dedicated circuit, external disconnection to the condenser.
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Objective : four-season comfort, low noise, preserved aesthetics.
Are you considering a similar HVAC installation in Montreal , Laval , Longueuil , on the North Shore or the South Shore ? Contact us: a technical visit is sufficient to confirm the capacity, layout and eligibility for available programs.
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?
Pick what looks like your need.
Four mistakes we do not make
Flip each card to see what we do instead.
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).