Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
AirGreen installs a wall-mounted Sharp ZU1 in Rosemont–La Petite-Patrie: short route, gravity drain, careful finishes and R-32 performance for four-season comfort 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.
Four-season comfort and lightweight construction: a careful installation that maximizes space, optimizes airflow, and prepares for Montreal's winter.
Project context and comfort objectives
At AirGreen , we were approached by a young couple living in a condo in Rosemont–La Petite-Patrie . Their need: a compact and quiet HVAC solution, efficient for air conditioning in the summer and reliable for supplemental heating in the winter. We selected a Sharp ZU1 (R-32), sized for the open living area, with an emphasis on visual discretion and airflow optimization.
Why the Sharp ZU1?
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Performance : High-efficiency R-32 inverter technology, ideal for reducing consumption and stabilizing temperature.
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Extreme cold : reliable performance down to approximately −25°C , adapted to the climatic variations of Greater Montreal .
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Air quality : multi-stage filtration and anti-odor functions useful in urban spaces.
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Quiet : Very low noise level from the interior head, perfect for open areas and adjacent rooms.
Key steps in HVAC installation
Interior layout
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Installed in the upper part, centered above a sliding storage unit to free up the side walls and maximize the flow range.
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Respect wall clearances and intake/insufflation distances to avoid air recirculation and “dead zones”.
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Rear wall passage for a short route : careful drilling Ø ≈ 65 mm, vapor barrier insulation and interior sealing.
Refrigeration and evacuation route
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New, continuously insulated refrigeration connections with white exterior capping to match the woodwork.
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Gravity drain (no condensate pump required), controlled slope and outlet protected against frost and splashing.
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Nitrogen leak tested, deep vacuum drawn, then charged to Sharp specifications.
Power supply
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Connection to a dedicated 240V circuit with an appropriate circuit breaker, inter-unit wiring protected and marked. Check the direction of fan rotation and the currents at full speed.
Result: consistent comfort and discreet aesthetics
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Linear diffusion that covers the entire living area without direct air flow onto the seating area.
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Simple finish: minimal appearance, imperceptible noise during normal conversation, and interior facade perfectly aligned with the ceiling.
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Reduced energy demand for air conditioning and winter supplementary heating during peak hours.
Sizing: Our three-point method
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Thermal balance of the room (envelope, orientation, internal contributions).
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Ceiling height and obstacles (cupboards, drops) to control the airflow.
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Use : day/evening occupancy, night mode, realistic temperature settings.
Good practices and pitfalls to avoid
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Do not oversize : a unit that is too powerful will cycle quickly, wear out the compressor and reduce comfort.
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Respect the drain slope : a few millimeters per meter are sufficient, but continuously to avoid backflows.
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Provide maintenance access : washable filter accessible, caps and screws clear.
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Protect the exterior : condenser supports and clearances for snow; natural de-icing guaranteed.
Maintenance and longevity — recommended HVAC maintenance
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Clean filters every 4–8 weeks during peak season.
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Annual inspection: operating pressures, electrical tightening, condensate test, cleanliness of the exchanger.
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Exterior: clearing the grid, checking the fixings and capping after windy periods.
Local Grants and Eligibility
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Recent high-efficiency R-32 wall-mounted heat pumps are generally eligible for local assistance in Quebec. We systematically verify eligibility based on the file and the housing configuration in Montreal , Laval , Longueuil , the North Shore and the South Shore .
Why AirGreen for your HVAC system ?
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Team dedicated to urban housing (plexes, condos), clean finishes, controlled deadlines and responsive after-sales service.
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Advisory approach: we explain the impact of each choice (location, route, winter protection) on performance and bill.
Daily usage tips
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Auto/Heat mode in winter with stable setpoint; avoid frequent variations.
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Wide sweeping shutters to homogenize the temperature.
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In summer, activate dehumidification on stormy days for increased comfort at a higher setpoint.
Useful keywords : heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore .
Need four-season comfort in Greater Montreal? We install and maintain Sharp and other recent R-32 wall-mounted heat pumps, with a quality finish designed to last.
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).