Installation of a Sharp ZU1 wall-mounted heat pump in Saint-Léonard (Montreal)
AirGreen installation of a Sharp ZU1 in Saint-Léonard: bracket installation, optimized snow clearance, performance in extreme cold, and meticulous finishing. An HVAC installation designed for the climate of Greater Montreal.
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The job on one screen
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
Winter installation on blond brick: performance in extreme cold and optimized snow clearance
In Saint-Léonard , an area known for its blond brick plexes and narrow side walkways, we have just installed a Sharp ZU1 wall-mounted heat pump . The work took place in real winter conditions, with snow on the ground , which allowed us to apply our best practices for frost management and clearances around the condenser. The result: a clean, robust HVAC system ready to provide four-season comfort .
Owner's objectives and site constraints
Our client wanted:
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air-condition the main floor in the summer and support heating in the winter;
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reduce energy costs related to electric baseboard heaters;
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preserve traffic in the side aisle and avoid floor clutter.
The site presented several typical constraints: nearby basement windows , snow accumulation along the wall, and brick masonry requiring suitable anchors. We therefore opted for installation on galvanized wall brackets at a height calculated to remain sheltered from snowdrifts, while respecting service clearances.
Why the Sharp ZU1 range
The Sharp ZU1 is a must-have for Montreal homes looking for a balance between performance, quietness and durability:
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Inverter compressor for fine modulation and measurable savings ;
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Extreme cold performance : capacity maintained down to around −25°C , ideal for the local climate;
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R-32 refrigerant , less impactful than the old R-410A;
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Sharp's own Plasmacluster air treatment for a healthier interior;
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Controlled acoustics , essential in side aisles and near openings.
The capacity chosen falls within the usual range of 12–18 k BTU , depending on the thermal loads of the floor and the distribution of the rooms.
Outdoor installation: stability, security and aesthetics
The condenser is securely mounted on wall brackets with anti-vibration pads and stainless steel bolts. This configuration:
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keeps the unit out of the snow and splash zone ;
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limits the transmission of vibrations to the structure;
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facilitates natural de-icing and seasonal maintenance.
An upper support (high brackets) is provided for the addition of a snow guard if necessary, when the roof creates ice falls during thawing. The refrigeration connections exit at the rear of the unit and are insulated along their entire length; they are neatly gathered against the facade to reduce the visual footprint. The external disconnect and cable protection follow the current electrical requirements for rapid de-energization during maintenance operations.
Visible details and best practices applied
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Height of approximately 1 m above finished ground for snow clearance;
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Wide plate brackets , anchored in the brick with suitable sealing;
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Level and plumb checked for defrost drain;
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Radius of curvature of the connections respected to preserve the integrity of the tubes;
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Free area in front of the exchanger to ensure air flow .
Route of connections and management of condensates
Inside, the wall-mounted head serves the living area. The refrigeration path favors a short trajectory with a minimum of elbows in order to reduce pressure losses. Condensate management in air conditioning mode is provided by a dedicated drain with a continuous slope; when the interior configuration requires it, we integrate a silent lifting pump and a non-return valve to make the evacuation reliable. These choices prevent any infiltration near the basement windows .
Steps to a Successful Winter HVAC Installation
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Thermal survey and selection of suitable capacity (surface, insulation, exposure).
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Marking anchors in the brick and checking clearances.
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Controlled slope drilling , sleeve and peripheral sealing .
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Installation of brackets , level adjustment and installation of the condenser with anti-vibration.
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Drawing of connections , continuous insulation, mechanical fixing, UV and weather protection.
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Brazing/crimping , nitrogen infiltration , deep vacuum (< 500 microns), then opening of the fluid.
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Controls : pressures, temperatures, intensity, delta T blowing/return, defrost test.
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Commissioning : remote control configuration, HVAC usage and maintenance tips.
Even in cold weather, these steps ensure smooth start-up and stable heating .
Measured results and perceived comfort
Upon activation, the Sharp ZU1 delivers gentle, continuous heat. Inverter modulation prevents short cycles , improves seasonal efficiency , and reduces wear and tear. Outdoors, noise levels remain very low , which is important for side walkways often close to neighbors.
HVAC Maintenance: Recommended Schedule
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Internal filters : clean every 4–8 weeks during periods of heavy use.
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Outdoor battery : rinse with gentle jet in spring and fall.
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Annual inspection : refrigerant check, electrical tightening, condensate test, exchanger cleaning.
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Winter : maintain clearance in front of the condenser and check for ice accumulations; add a snow guard if the roof warrants it.
Tips for maximizing savings
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In heating , choose a moderate setting and let the inverter work continuously.
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Use the head sweep to push air into the hallway and adjacent rooms.
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In summer, activate the dehumidification mode on heavy days to improve comfort at a higher setpoint.
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Combine the heat pump with small sealing actions (bottom of doors, caulking) to amplify the gains.
Grants and support
The Sharp ZU1 (R-32) range is among the energy-efficient solutions generally eligible for assistance programs in Quebec, subject to performance criteria. We support our customers in Montreal, Laval, Longueuil, North Shore and South Shore : estimating savings, preparing files and submitting applications, in order to accelerate the return on investment .
Pitfalls to avoid (AirGreen feedback)
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Undersized capacity: discomfort and excessive consumption.
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Insufficient clearances : recurring frost, noise, drop in performance.
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Neglected connection protection : premature aging of insulation.
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Absence of external disconnect : non-compliance and complicated maintenance.
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Improvised condensate management : risks of infiltration near basement windows.
What this installation demonstrates
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Mastery of masonry anchors and snow-free installation;
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Aligned finishes and compact routing of connections to preserve aesthetics;
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Reliable winter starting and immediate comfort;
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A complete service , from thermal study to commissioning , then to HVAC maintenance .
Conclusion
The Sharp ZU1 wall-mounted heat pump installed in Saint-Léonard illustrates our requirement: a precise, durable HVAC installation designed for the Montreal climate. Between energy savings , silence and integration on a blond brick facade, we deliver a system ready to ensure lasting comfort all year round. For similar projects in Montreal , Laval , Longueuil , on the North Shore as well as on the South Shore , our team applies the same rigor and supports each owner in subsidies and maintenance.
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).