Installation of a Sharp ZU1 wall-mounted heat pump in Chomedey (Laval)
AirGreen installs a Sharp wall-mounted heat pump (R-32) in Laval – Chomedey : discreet white capping, optimized routing, gravity drain and instrumented commissioning. High-performance HVAC installation for four-season comfort.
Take a tour of the installation
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.
A clean, straight-to-the-point installation: four-season comfort and impeccable aesthetics
At AirGreen , we have just installed a Sharp wall-mounted heat pump ( ZU1 range, R-32 refrigerant) on a single-family residence in the Chomedey sector, Laval . The objective set with the owners is clear: to obtain stable heating and air conditioning all year round, reduce the electricity bill and preserve the neat appearance of the light brick facade.
Why Sharp for this house in Laval?
The Sharp ZU1 range features highly responsive inverter technology and its renowned Plasmacluster air treatment, popular for indoor comfort. Powered by R-32 (which has higher efficiency and lower global warming potential than R-410A), the machine combines energy efficiency and reliability in cold weather.
In heating, the compressor modulates finely to maintain a constant temperature; in air conditioning, the unit quickly reaches the comfort point while maintaining a contained noise level .
In short:
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Equipment type: wall-mounted heat pump (mini-split)
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Brand: Sharp
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Range: ZU1 (R-32, Inverter, Plasmacluster)
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Use: four-season heating + air conditioning
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Efficiency target: stable performance at low temperature, tangible energy savings
The project: a clear, straight and lasting integration
The outdoor unit is installed on the ground on a slab (rigid and leveled base) to ensure stability and vibration decoupling . We position the unit with the regulatory clearances around the fan grille and the discharge, in order to optimize air circulation, defrosting performance and ease of maintenance.
The refrigeration path and the communication/power wiring follow a white technical cover (capping) placed vertically then horizontally along the brick. This layout combines visual sobriety and accessibility for future interventions (maintenance, leak testing, replacement of components).
Installation Highlights:
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White vertical and horizontal capping perfectly aligned with the brick joints for aesthetic integration .
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Estimated useful length of connections 7 to 9 m , optimized to limit pressure losses and facilitate oil return .
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Single, sealed drilling (sleeve + suitable sealant), controlled slope for gravity drainage of condensate — no pump required.
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Dedicated circuit breaker and nearby external disconnect switch , complying with safety requirements and the Canadian Electrical Code .
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Leak tests , deep vacuum , gassing according to the load and verification of subcooling/superheating before delivery to the customer.
Sizing and comfort: the AirGreen method
The choice of capacity is never left to chance. We perform a thermal load calculation (envelope, orientation, glazing, infiltration, room usage). On this project, the capacity chosen covers the main living area and the upper floor without oversizing, which avoids short cycles, preserves the humidity level and extends the compressor's lifespan .
Concrete benefits for owners:
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Efficient heating at the beginning and end of the season, with power maintained when the temperature drops.
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Even air conditioning during heat waves, without uncomfortable drafts thanks to inverter modulation.
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Reduced noise both inside and outside thanks to the choice of slab, anti-vibration mounts and optimized rotation speeds.
Execution details that make the difference
1) Journey designed to last
The cladding follows a clear vertical axis then a horizontal shaping at the bottom of the wall: this design limits tight bends, protects the insulation from the connections and makes it easier to read the route during maintenance. The stainless steel fixings and anchors adapted to the brick guarantee exemplary resistance over time.
2) Protection against bad weather
The raised slab keeps the unit away from water and snow accumulations . The pipes are continuously insulated , without crushing, and UV protected in the capping. In winter, the unit freely releases air during defrosting - a crucial point for maintaining efficiency .
3) Clean electrical connection
We provide an accessible non-fusible disconnect switch and separate electrical routing of the refrigerant connections in the cover, for readability and safety . Labeling on the panel allows for quick circuit identification.
Result: aesthetics, performance and serenity
On this pale brick facade, the white capping visually disappears and the Sharp outdoor unit integrates without harming the architecture. Airflow is free, maintenance access is easy, and owners now benefit from stable comfort with optimized electricity consumption .
The dehumidification mode (in summer) and the extended modulation range guarantee a pleasant feeling, fewer temperature variations, and improved air quality thanks to the Plasmacluster .
Subsidies and energy savings
New generation R-32 wall-mounted heat pumps are generally eligible for efficiency support programs (e.g., the Rénoclimat program and related assistance from Hydro-Québec, depending on the final configuration). We support our customers in preparing the file , maximizing credits and documenting the required performance (technical data sheets, proof of installation, photos).
HVAC maintenance: maintaining performance over time
An annual maintenance by our technicians allows:
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clean the evaporator/condenser and restore heat exchange ,
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check the circuit tightness and operating parameters ,
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check the flow of condensates and the condition of the capping/insulation ,
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Update settings to reduce consumption and extend lifespan .
On the user side, we recommend rinsing the filters of the interior head (monthly in summer), maintaining exterior clearances and avoiding any obstructions (vegetation, objects, snow).
Common Mistakes…and How We Avoid Them
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Routes that are too long or with tight bends → pressure losses and noise: we favor a short and readable route , with compliant radii.
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Condensate pumps not required → breakdowns and noise: here, gravity drain with controlled slope.
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Poor clearances around the condenser → drop in efficiency: installation complies with the recommended air clearances .
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Leaky holes → infiltration: suitable sleeve + sealant , careful finish.
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Approximate sizing → discomfort and short cycles: systematic load calculation at AirGreen.
AirGreen, Greater Montreal's HVAC partner
Our team operates in Montreal, Laval, Longueuil, North Shore and South Shore . Each project follows the same standard: precise diagnosis , installation engineering , clean execution , instrumented commissioning and after-sales support .
In Chomedey as elsewhere, our promise remains the same: lasting comfort , an HVAC installation that enhances your property , and the peace of mind of a well-designed system.
The final word
This Sharp wall-mounted heat pump installation in Laval combines the winning trio: performance , silence , and aesthetics . A respected facade, immediate comfort, and contained operating costs—exactly what the owners were looking for.
The unit on this job, in figures
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 big day, step by step
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 would it look like 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.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
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.
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.
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).