Installation of a Sharp ZU1 Wall-Mounted Heat Pump | 18,000 BTU on the roof in Pierrefonds
Rooftop installation in Pierrefonds of a Sharp ZU1 18,000 BTU wall-mounted heat pump. Efficient solution at -27°C with raised base, $2,640 LogisVert grant, Wi-Fi control, and full AirGreen service.
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 technical installation on a flat roof in Pierrefonds: performance, reliability and energy efficiency
At AirGreen , every wall-mounted heat pump installation project is unique. We recently completed a flat roof installation in Pierrefonds , west of Montreal, featuring the Sharp ZU1 18,000 BTU Wall-Mounted Heat Pump , a high-performance, quiet model perfectly suited to the Quebec climate. This type of roofing work requires precision, expertise, and special attention to the stability and durability of the anchors.
A wise choice: the Sharp ZU1, a concentrate of technology
The model installed here, the Sharp ZU1 18,000 BTU , uses R-32 refrigerant , known for its low global warming potential (GWP). This wall-mounted mini split is ENERGY STAR® certified for cold climates and offers heating performance down to -27°C . It is a popular choice among homeowners in Pierrefonds and across the island of Montreal , looking for an eco-responsible energy solution without compromising on comfort.
Technical specifications of the Sharp ZU1:
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Heating capacity down to -27°C
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SEER2 : 24.0 | HSPF2 : 10.0 | EER2 : 13.0
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Built-in Wi-Fi for smart remote control
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Outdoor noise level : 52 dB(A) | Indoor: between 25 and 49 dB(A)
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Eligible LogisVert grant: $2,640
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R-32 refrigerant , more ecological and efficient
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Exceptional warranty: 10 years parts, labor and compressor
Special features of flat roof installation
This project in Pierrefonds presented a unique installation challenge: installing the outdoor unit directly on the roof of the residential building. To achieve this, our team opted for a raised, stabilized base consisting of:
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Anti-corrosion metal legs mounted on treated wooden beams , well anchored to prevent any movement .
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Optimized fan orientation towards the outside to ensure good air release.
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Frost and heat resistant supports , allowing durability in all seasons.
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A secure power supply with a circuit breaker box mounted on the brick chimney.
Why install a heat pump on the roof?
Installing a heat pump on a flat roof is sometimes a necessity, especially when there is limited floor space or the client wants to free up the facades. This has several advantages:
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Saves floor space , ideal in urban areas such as Montreal
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Less noise at ground level , a significant advantage in quiet residential areas
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Protection against potential ground damage (snow, debris, animals)
However, this requires in-depth expertise to ensure long-term sealing, stability and proper functioning.
Steps of AirGreen installation in Pierrefonds
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Technical analysis and personalized quote on site.
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Structural reinforcement of the roof (if necessary) validated with a building engineer.
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Safe transport of the outdoor unit to the roof using a winch.
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Installation of the base on beams and precise leveling to ensure stability.
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Connecting the refrigeration lines to the AY-XP18ZU1 indoor wall unit.
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Electrical connection to the building panel via safety box.
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Power-on tests and Wi-Fi calibration with the customer.
Pierrefonds customer testimonial
“Very satisfied, fast heating and remarkable energy efficiency thanks to R-32 gas. Everything was installed in just one day, without disturbing the neighbors. Excellent work by the AirGreen team!” — Timothée Thériault, Pierrefonds
LogisVert Grant: a smart investment
Thanks to the high energy efficiency of this model, our Pierrefonds client was able to benefit from the $2,640 LogisVert grant , available through Hydro-Québec for primary residences. This provincial program significantly reduces the purchase and installation costs of eco-friendly heat pumps.
AirGreen expertise: a guarantee of trust
By choosing AirGreen , you choose:
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A professional installation certified to comply with RBQ standards.
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A team that listens, is there from the estimate to the interview .
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Sustainable solutions, optimized for Quebec winters .
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Sharp certified technicians , trained on the latest HVAC technologies.
Our complementary services in Montreal and the surrounding area
AirGreen offers complete heating, air conditioning and ventilation services in Montreal , Laval , Longueuil , on the North Shore and the South Shore :
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Installation of wall-mounted and central heat pumps
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HVAC Maintenance and Repair
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Energy assessments and grant advice
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Fast emergency service, even in winter
How it goes, from the first call to the end
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 the unit delivers when it is cold
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.
And 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.
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.
Which type of equipment for your project?
Pick what looks like your need.
Four mistakes we do not make
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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).