Installation of a Sharp ZU1 wall-mounted heat pump in Outremont
Outremont: HVAC installation of a Sharp ZU1 wall-mounted heat pump . Snow-free brackets, careful cladding, vacuum sealing, and fine adjustments for four-season comfort. AirGreen Greater Montreal service.
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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
Discretion, performance and respect for stone architecture
In Outremont , where masonry residences and wooden annexes require a careful approach, our team carried out the HVAC installation of a Sharp ZU1 wall-mounted heat pump . The objective: to offer four-season comfort to a family home while preserving the building's aesthetics and optimizing reliability in Montreal winters.
Customer context: targeted comfort and constraints of a garden level
The owner wanted to air condition/heat a partially basement level overlooking a garage. The area has marked temperature variations : cool in spring, accumulated heat in summer. Priorities:
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A compact and quiet wall-mounted device ;
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A snow-free and splash-proof installation ;
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Easy maintenance access to ensure durability.
We recommended a Sharp ZU1 (R-32 extreme cold range) in wall-mounted format for its inverter modulation , its stability at low temperatures and its very good efficiency/compactness ratio for urban homes. The power (BTU) was sized according to the surface area, insulation and sunshine rate of the room.
Exterior integration: brackets, height excluding accumulation and hooded lines
The outdoor unit is fixed on galvanized brackets anchored in the masonry, above the stone wall. This configuration:
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keeps the device out of snow areas and away from parking lot dust;
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facilitates the flow of condensates ;
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limits vibration transmission to the structure.
The refrigeration connections and the communication cable are insulated and covered by a rigid UV-resistant technical conduit. The route follows the wooden facade for a discreet appearance, before crossing the wall as close as possible to the interior head (single drilling, waterproof sleeve and adequate slope).
Power management and electrical protection
Near the garage, the dedicated power supply has been separated and identified on the panel. An accessible service switch allows for quick isolation for maintenance. The routing complies with the manufacturer's specified clearances and bending radii .
Commissioning: Nitrogen test, deep vacuum and fine adjustments
The project was carried out using the AirGreen method:
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Nitrogen test of the copper network to validate the tightness of the flared fittings.
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Deep vacuum extraction using a professional vacuum pump and a digital manifold (pump visible at the base of the wall, manifold connected to the unit). We aim for a stable vacuum level and the rise test to certify the absence of humidity and air.
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Opening of service valves and balancing of the circuit according to ambient conditions.
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Functional checks : compressor current, superheat/subcooling, fan speeds, automatic defrosts.
This protocol ensures long-lasting performance and prevents acid oxidation linked to residual moisture in the compressor oil.
Coexistence with neighboring equipment and air circulation
The site had another outdoor unit (marking visible in the photo). We have:
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Respect the suction/discharge clearances to avoid recirculation of hot air ;
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Direct the blowing so as not to impact the garage passage area;
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Checked the condensate runoff so that it does not affect the masonry or parking spaces.
Inner head: immediate comfort and precise modulation
On the inside, the wall-mounted fan is positioned to evenly sweep the entire garden level. Thanks to inverter modulation , the machine maintains a stable temperature while consuming exactly the energy needed . In summer, the drying of the air improves the feeling of comfort; in winter, the heating mode provides a rapid and controlled rise in temperature.
Condensate management: priority to gravity
The configuration of the garden level allowed us to opt for gravity flow (the simplest and most reliable solution).
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Continuous slope on the line;
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Protected exit away from freezing areas;
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Possibility of diversion in the event of future terrace development.
If gravity had not been possible, we would have installed a silent condensate pump with a holding tank and high alarm.
Noise and vibrations: real comfort in daily use
Outremont being residential and quiet, we systematically work on:
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Anti-vibration mounting of the brackets;
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Tightening the fasteners to the correct torque ;
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Smooth routing of connections to avoid hard points;
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Nighttime tests simulating low inverter speeds.
Result: the Sharp heat pump operates with a reduced exterior noise level , compatible with relaxation areas and proximity to neighbors.
Winter resistance and intelligent defrosting
The Sharp ZU1 range is designed for the climate of Greater Montreal . Defrost cycles are optimized to limit power loss, and electronic management prioritizes interior comfort . Combined with proper installation height and adequate rear clearance , the machine maintains its performance even during episodes of blowing snow.
Time to complete and coordinate
The intervention took place in one day , including:
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preparation of the facade and identification of anchors;
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installation of brackets and cover ;
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soldering/crimping of connections, leak testing;
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vacuuming , setting and load testing;
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user briefing with the customer (remote control, eco functions, filters).
HVAC Maintenance: What We Schedule with Our Clients
To maintain performance:
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Cleaning filters 3–4 times per air conditioning season;
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Annual AirGreen inspection (pressure switches, connections, exchangers, condensates, tightening);
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Gentle washing of external batteries in spring;
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Periodic inspection of the covers and the condition of the UV insulation.
Regular HVAC maintenance protects major parts (compressor, fans) and maintains minimal power consumption .
Grants and Eligibility
Recent wall-mounted heat pumps , efficient in extreme cold and with new-generation refrigerant , may be eligible for certain assistance programs in Quebec. We support our customers in verifying the criteria (seasonal performance, operating temperatures, certification) for Montreal, Laval, Longueuil, North Shore and South Shore .
Common Mistakes to Avoid (and How We Prevent Them)
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Undersize the BTU power: we carry out a load calculation taking into account the envelope and uses.
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Poor condensate slope : systematic level control and flow tests.
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Insufficient clearances around the condenser: location validated on plan and on site.
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Flare connections without torque meter: tighten to torque and resume after heating.
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Absence of deep vacuum : compliant vacuum draw with ascent test to make the circuit more reliable.
Result: immediate comfort, preserved facade, easy maintenance
After testing, the ground floor room quickly reached the set temperature , humidity was better controlled and the noise level remained very low, even with the doors to the garage open. The façade retained its character thanks to the discreet cladding and the aligned brackets in the stone joints.
Why choose AirGreen for Outremont and the center of the island?
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Mastery of stone buildings and access limitations;
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Certified team for refrigerant handling and commissioning;
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Objective advice on brands (Sharp, Fujitsu, Gree, Midea, etc.);
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Fast turnaround times and local after-sales service;
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Assistance with grants and insurance documents .
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).