Installation of a Sharp ZU1 wall-mounted heat pump in Sainte-Dorothée (Laval)
In Sainte-Dorothée, AirGreen installed a Sharp ZU1 wall-mounted heat pump with a Sharp Eco Inverter outdoor unit on a raised support, an ideal configuration to face the Quebec winter and improve residential comfort all year round.
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The unit’s data sheet
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 article, chapter by chapter
In Sainte-Dorothée , a residential neighborhood with many single-family homes and small apartment buildings with outdoor storage (sheds, annexes, garages), AirGreen installed aSharp wall-mounted heat pump designed to provide consistent comfort year-round. The mandate was clear: to modernize the heating and air conditioning with a reliable, quiet, and energy-efficient system, while ensuring a clean, protected, and durable outdoor installation that could withstand Greater Montreal's winters.
In the photos, you can clearly see the Sharp ECO INVERTER outdoor unit with the Plasmacluster label, installed on a raised support, a detail that speaks volumes about the quality and logic of the installation.
An ideal solution for residential use: the Sharp wall-mounted heat pump
The type of system installed here is a wall-mounted heat pump (mini-split) . This is the most popular option for improving comfort without having to modify a ductwork system. In an area like Sainte-Dorothée, this is particularly relevant: many properties have distinct living zones (basement, main floor, open concept living area, upstairs bedrooms), and the wall-mounted heat pump provides a much more stable temperature than electric baseboard heaters alone.
Selected model: Sharp ZU1 (consistent product range)
Even though the nameplate is not legible in the photo, the Sharp outdoor unit displaying Eco Inverter and Plasmacluster aligns very well with an installation of the Sharp ZU1 (R-32) range, a model that we often recommend when you want an excellent balance between performance, comfort and energy efficiency.
What we're looking for with a Sharp ZU1:
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Heating and air conditioning on the same system
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High efficiency thanks to inverter technology
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Acoustic comfort (quiet operation, highly appreciated in residential settings)
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Reliability and stability, particularly useful during periods of variable cold.
Visible installation details: an outdoor unit designed for Quebec winters
This installation is a good example of what is called a "smart" outdoor installation. The outdoor unit is placed in a sheltered space (such as a shed/alcove), on a solid base, and most importantly, elevated .
1) Elevated support: protection against snow, ice and water
The unit is mounted on a metal stand with pads that limit vibration transmission. In Laval, this choice is far from being merely aesthetic: it's a concrete measure to increase the system's lifespan.
Why raise the outdoor unit?
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Prevent snow from accumulating and blocking air exchange
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Reduce the risk of ice buildup at the bottom of the unit (drainage, defrosting)
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Limit exposure to puddles and freeze/thaw cycles
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Facilitate maintenance (cleaning, inspection, access)
2) Installation in a partially protected area: good for durability, provided that clearances are respected.
We can see that the unit is positioned under a structure (wooden ceiling, storage area). This is often an excellent compromise: less direct exposure to the elements, less blown snow, less debris thrown up.
At AirGreen, when installing in a semi-enclosed environment, we always check:
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Recommended clearances around the unit (air inlet/outlet)
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The ability to expel hot/cold air without recirculation
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Access for maintenance (panels, connections, cleaning)
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The absence of obstacles that could amplify noise or vibrations
This is exactly the type of detail that transforms a "simple installation" into a sustainable and efficient one.
3) Vibration management and stability
The visible supports and bearings limit micro-vibrations. The result: less resonance in the structure, less noise perceived inside, and less premature wear on certain parts.
Why this type of installation is particularly relevant in Sainte-Dorothée
Sainte-Dorothée combines the advantage of more spacious properties with very real winters (wind, snow, humidity, frost). A properly installed Sharp wall-mounted heat pump provides immediate benefits:
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Stable comfort : no more "too cold" or "too hot" zones
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Effective cooling in summer, especially during heat waves
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Improved humidity management in air conditioning
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Energy savings thanks to modulating (inverter) operation
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Reduced reliance on electric baseboard heaters during the shoulder seasons (and often longer)
Plasmacluster: a plus for perceived air quality
The presence of the Plasmacluster logo on the Sharp outdoor unit is a significant indicator: Sharp heavily promotes this technology, associating it with comfort and air quality. Without overpromising (every home is different), this is a selling point appreciated by many customers: they are installing a system that goes beyond simply "heating and cooling," but rather takes a more holistic approach to comfort.
The typical AirGreen process: clean installation, rigorous commissioning
Even when the installation seems simple, our method remains the same, because it's the details that make the difference over 10–15 years:
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Analysis of needs (surface area, rooms, lifestyle, insulation)
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Choosing a suitable Sharp model (appropriate BTU capacity)
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Interior positioning: air diffusion, comfort, aesthetics
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Exterior positioning: clearances, level, drainage, noise, access
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Vacuuming, leak testing, commissioning
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Checking the modes (heating, air conditioning, defrosting) and explaining them to the customer
Common mistakes to avoid with this type of installation (and why it matters)
In Greater Montreal, we still too often see facilities that function… but age poorly. Here's what we systematically avoid:
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Ground-mounted unit : high risk of snow accumulation, ice, and accelerated corrosion
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Insufficient ventilation : reduced performance, air recirculation, more frequent defrosting
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Unstable support : vibrations, noise, mechanical fatigue
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Difficult access : neglected maintenance, more costly breakdowns
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Poorly designed protection : accumulation of leaves/debris, obstruction
In the photo, the approach is clear: support, stability, and winter logic.
Maintenance tips to keep your Sharp performing well year after year
A Sharp wall-mounted heat pump is robust, but like any equipment, it performs best when properly maintained.
To be done regularly (simple and effective)
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Clean/vacuum the filters of the indoor unit (during periods of heavy use)
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Keep the outdoor unit clear (of leaves, debris, accumulated snow)
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Visually check that nothing is blocking the air intake/outlet
To be done periodically (ideally with AirGreen)
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More thorough cleaning (depending on the environment)
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Pressure and yield check
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Inspection of connections and flow
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Defrosting behavior control (winter)
Conclusion: a well-thought-out Sharp installation, ready for Laval's climate
This installation in Sainte-Dorothée (Laval) perfectly illustrates what we strive for at AirGreen: a high-performance Sharp system, installed with sustainability and comfort in mind. The choice of a Sharp ZU1 wall-mounted heat pump and the attention paid to the outdoor unit (elevated mounting, stability, protected location) ensure more reliable operation, especially during periods of cold, snow, and freeze/thaw cycles.
If you are in Laval (Sainte-Dorothée, Chomedey, Fabreville, Duvernay, etc.) or elsewhere in Greater Montreal, we do the same thing: a clean, coherent installation, designed to last.
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The job tools
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.
How the job unfolds
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 we check on a job like this one
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.
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.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
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.
The right pages, at the right time
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).