Installation of a Sharp ZU1 (R-32) wall-mounted heat pump in Rosemont–La Petite-Patrie
In Rosemont–La Petite-Patrie, we are installing a Sharp ZU1 (R-32) wall-mounted heat pump : precise airflow, silence, and efficiency for a Montreal living room. AirGreen — 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 discreet wall-mounted fan that transforms a Montreal living room into a four-season comfort zone—with precise, quiet airflow
Context and objectives: breathe better and experience the show better
In a bright apartment in Rosemont–La Petite-Patrie , our client wanted to stabilize the living room temperature: cool on hot days, pleasant in autumn and spring, while reducing the load on the existing heating system. The room's configuration—a glass exterior wall with curtain rods, light wood furniture, and a large plant display—required a compact , quiet , and aesthetic solution. We selected a Sharp ZU1 (R-32) wall-mounted heat pump , a recent generation that combines high efficiency, precise blowing, and low visual impact.
Why the Sharp ZU1 (R-32) is the perfect fit
-
Extreme cold : maintaining performance in Montreal winters, ideal for topping up to low temperatures.
-
R-32 refrigerant : reduced charge, better heat transfer and lower GWP than R-410A.
-
Silence : Low/Quiet modes suitable for open living spaces; noise contained even in the evening.
-
Energy balance : High SEER/HSPF which limits mid-season costs and ensures stable comfort .
-
Diffusion precision : motorized shutters and deep fins that channel the air along the walls, avoiding unpleasant currents on the sofa.
Sizing and placement logic
Our technical visit confirms that the show presents:
-
An exterior load-bearing wall ready to accommodate the crossing;
-
A dedicated electrical outlet at the bottom of the wall for power supply;
-
A peripheral circulation without major obstacles.
We fix the head in the upper part , on the exterior wall side, at a distance from the ceiling drop. This controlled corner positioning allows:
-
Direct the jet parallel to the wall and along the curtain, which extends the range into the sofa area without direct blowing on the occupants;
-
To recycle hot air in winter: the fins direct downwards and run along the wall visual to deposit the heat at seat height;
-
To preserve a flush aesthetic : the unit blends into the white of the wall and leaves the plant decor intact.
Refrigeration path and condensate management
-
Short wall passage behind the unit to the outside, which reduces pressure losses and limits interior space requirements.
-
Prioritized gravity evacuation : calibrated slope of the condensate pipe to avoid stagnation and odors.
-
Discreet exterior capping in a light shade, wall brackets for the condenser (out of view from the living room), clearances respected for maintenance.
-
Brazing under nitrogen and deep vacuum ; leak test documented before commissioning.
Electrical integration and protection
-
Dedicated line with circuit breaker of the required rating and disconnection box near the outdoor condenser.
-
Clean cable routing, collars and waterproof bulkheads for a finish without visible bleeding.
-
Grounding checked and emergency stop accessible as required.
Commissioning: precision of settings for a living room
-
Calibrate the indoor sensor to match the temperature felt on the couch.
-
Programming the shutters : in air conditioning, tilt slightly above the horizontal to carry the air along the ceiling and avoid any direct flow onto the reading corner; in heating, a more closed angle to deposit the heat in the center of the living room.
-
Airflow : low to medium speed in the evening for silence, automatic during the day when solar input varies.
-
Activate gentle drying mode in summer to control humidity without overcooling.
Result obtained: comfort, silence and aesthetics
The heat pump quickly stabilizes the room: in summer, dehumidification prevents the feeling of heaviness; in mid-season, the additional heat eliminates morning/evening differences. The minimal noise level allows for undisturbed conversations or watching a movie. The compact and well-aligned unit follows the decorative lines of the room, reinforcing the perceived value of the living room.
Daily usage tips
-
Keep the curtains in the open position around the blower vent so as not to interfere with stratification .
-
Avoid placing a high shelf directly under the unit.
-
In hot weather, keep the temperature around 23–24°C; the feeling of comfort is mainly linked to dehumidification .
-
When heating, prefer a gradual increase to keep the unit quiet and efficient.
Recommended HVAC maintenance
-
Every 1–2 months in summer : Wash filters to maintain airflow.
-
Annual : controlled cleaning of the fan and evaporator , checking of condensate flow, checking of connections and insulation.
-
Every 2–3 years : complete overhaul including outdoor condenser, fins and operating parameters.
Grants and Eligibility
Recent R-32 wall-mounted heat pumps , with high efficiency and extreme cold capacity, are often eligible for programs in effect in Quebec. We support each file (evaluation, documents, proof of installation) for projects located in Montreal , Laval , Longueuil , as well as on the North Shore and South Shore .
Key technical points of our intervention
-
Total line length optimized thanks to the proximity of the exterior wall.
-
Acoustic management : pads and spacers on the external condenser, avoiding resonances on the facade.
-
Finishes : unit rests perfectly level , stainless steel screws, clean joints, no unsightly protrusions.
-
Accessibility : Clear front cover for maintenance and periodic disinfection .
Common Mistakes Avoided
-
Undersizing in open rooms: we size the ZU1 to cover the loads linked to glazing and internal gains.
-
Uncontrolled condensates : controlled slope and long cycle flow test; no trace on the coating.
-
Blowing on the occupants : fine orientation of the shutters and natural anti-draft via the curtain wall.
Why entrust this type of project to AirGreen?
-
Local expertise on plexes and condominiums in Montreal: load-bearing walls, narrow passageways, brick facades, balcony access.
-
Demanding selection of recent brands (Sharp, Fujitsu, Gree, Midea, etc.) with R-32/R-454B refrigerants.
-
Completed HVAC installation : calculations, execution, instrumented commissioning, maintenance and support for subsidies .
Our approach aims for constant comfort , controlled consumption and careful integration into your decor.
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.
Useful pages for what comes next
More jobs to see, near you
By town, by equipment or by region: browse more than 4,700 published projects.
Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Tell us about your house. We come and see it for free.
The on-site estimate is free and the quote follows within 24 hours.
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).