Installation of a Sharp (ZU1 range, R-32) wall-mounted heat pump in Sainte-Julie
Installation of a Sharp R-32 wall-mounted heat pump in Sainte-Julie: wall brackets, black capping, gravity-fed condensate, calibrated commissioning. A meticulous HVAC installation by AirGreen for four-season comfort.
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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
In a quiet residential area on the South Shore , we are modernizing the comfort of a single-family home in Sainte-Julie with a Sharp ZU1 wall-mounted heat pump using R-32 refrigerant . The goal is clear: efficiently heat the living area in winter, cool it soberly in summer, and preserve the aesthetics of the vinyl facade as well as the tranquility of the neighborhood.
An R-32 solution designed for 4-season comfort
Sharp 's ZU1 range uses a high-efficiency inverter compressor and Plasmacluster air treatment technology. It is ideal for single-family homes: rapid temperature rise, precise power modulation and low consumption when needs are low, especially at night.
The advantages of the range for Sainte-Julie
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R-32 : better seasonal efficiency and lower global warming potential than previous generations, ideal for energy saving objectives in Montreal , Laval and Longueuil , as well as on the North Shore and the South Shore .
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Inverter : continuous regulation which avoids jolts and current peaks.
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Silence : reduced exterior noise level, significant near a terrace and a basement window.
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Plasmacluster : improvement of indoor air quality when the head operates in recirculation.
Target sizing: a capacity around 12,000 BTU typically covers an open ground floor with kitchen-living-dining room, while remaining economical outside of heat peaks.
Architectural integration: clean, solid and reversible
The outdoor unit is installed on galvanized wall brackets , above the level of the wooden terrace. This installation:
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frees up ground space and makes snow removal easier in winter;
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keeps the device away from dirt thrown up by mowing and rain;
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improves heat dissipation thanks to clearances respected on all sides.
We insert calibrated silent blocks between the device and the brackets to cut off vibration transmission in the structure. The anchors pass through the vinyl siding to take the load in the frame (uprights), with sealing washers and elastomer sealant around each drilling.
Capping and refrigeration process
The main capping , black and UV-resistant , runs vertically along a technical roof downpipe to visually blend into the façade. The lower section, near the terrace, is protected by a clear trunking, which reduces the risk of snagging. The refrigeration lines (high-density insulated copper) and the communication cable are grouped, tied and protected at friction points.
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Estimated beam length : 4 to 6 meters between inner head and condenser.
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Bending radii respected at the entrance to the device to preserve the integrity of the tubes.
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Connection treatment : butyl tape + heat-shrink sleeve for long-lasting protection against water and UV rays.
Condensate drainage: priority to gravity
The interior head is positioned on the courtyard side. The gravity condensate drain exits at the bottom of the wall, under the terrace, with a continuous slope and an outlet protected by a small deflector. No condensate pump here: less maintenance and no risk of additional noise during summer evenings.
Electrical Safety and Compliance
In the immediate vicinity of the condenser, a watertight disconnect switch makes it easy to isolate the unit for maintenance. The dedicated circuit (240 V) is connected via a conduit properly tightened by a cable gland , with clear markings. The height of the disconnect switch is chosen to remain accessible without obstructing passage on the terrace.
Our teams systematically carry out:
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grounding and checking the circuit breaker rating;
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checking the tightening of the terminals to the torque;
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labeling the circuit on the panel to simplify any future intervention.
AirGreen Methodology: from preparation to commissioning
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Implementation and validation of clearances (rear, sides and front).
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Controlled coring through the insulation and cladding, installation of a waterproof sleeve and a local vapor barrier to prevent infiltration.
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Leak tests with dry nitrogen, followed by deep vacuum (< 500 microns) and stabilization.
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Opening of the R-32 fluid and commissioning : superheat readings, subcooling , supply/return temperatures, compressor intensity, and recording of values in the customer file.
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Finishing touches : alignment of the capping, sealing touch-ups, cleaning of the area, instructions for use.
Result: immediate comfort and preserved facade
The customer benefits from stable heating despite rapid mid-season temperature fluctuations. In summer, the air conditioning reaches the setpoint without unpleasant drafts thanks to fine modulation. Outside, the facade remains clean: aligned black capping , short brackets, and free movement in front of the grille.
Concrete measures observed on site
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Suitable installation height : fins protected from water accumulation on the terrace.
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Air discharge management : orientation prevents direct airflow towards the seating area.
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Maintenance access : all covers and the service valve are clear for quick maintenance.
Best practices for a South Shore home
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Maintain 30 cm of clear space around the unit and clear snow in winter.
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Wash the inner head filters every 4 to 6 weeks during peak season.
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Programming temperature levels (night/day) rather than large differences: this is the strength of an inverter .
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Avoid objects between the unit and the deck guard that could disrupt airflow.
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Schedule annual HVAC maintenance : exchanger cleaning, electrical check, pressure and insulation condition verification.
Grants and Eligibility
Depending on the exact capacity and efficiency ratings of the indoor/outdoor unit pair, this heat pump may meet the criteria of active assistance programs in Greater Montreal. We assist with eligibility verification and file preparation for Montreal , Laval , Longueuil , the North Shore and the South Shore (proof of purchase, installation photos, technical sheets).
Small mistakes to avoid (AirGreen feedback)
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Drilling too low behind a terrace: risk of reversing the slope of the condensates.
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Undersize the device by prioritizing an entry-level price: the inverter will run at full speed and wear out more quickly.
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Neglect the acoustic impact on outdoor relaxation areas: it is better to orient the unit and choose suitable pads.
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Forgetting the accessible disconnect switch: safety and compliance requirement, useful for maintenance.
At AirGreen, we tailor each HVAC installation to the home and the occupants' lifestyle. For a Sharp R-32 wall-mounted heat pump , we combine performance, discretion, and ease of use. Whether you're in Sainte-Julie , elsewhere on the South Shore , in Montreal , Laval , or on the North Shore , our team delivers lasting comfort—documented and easy to maintain.
Keywords worked on : heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore .
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).