Installation of a SHARP BU DoubleZone Wall-Mounted Heat Pump in Verdun – Performance, Reliability, and Comfort on a Flat Roof in Quebec’s Winter
Installation of a SHARP BU DoubleZone wall-mounted heat pump in Verdun by AirGreen on a snowy flat rooftop. Optimal performance down to -27°C, Plasmacluster air purification, built-in Wi-Fi, and multi-room comfort.
Take a tour of the installation
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.
A strategic rooftop installation in the heart of winter, handled by AirGreen’s expert team
At AirGreen, we’re proud to highlight our most recent HVAC installation carried out in a residential sector of Verdun, Montréal. This project, completed on a snow-covered flat roof in the midst of Quebec's harsh winter, showcases not only our technical mastery, but also our ability to adapt our services to the most challenging weather conditions.
We installed a SHARP BU DoubleZone wall-mounted heat pump, a high-performance dual-zone system designed to deliver consistent performance even in extreme temperatures. This heating and cooling solution is perfectly suited for homeowners throughout the Greater Montreal area, including Montréal, Laval, Longueuil, the North Shore, and the South Shore.
Why choose a SHARP BU DoubleZone wall-mounted heat pump?
A dual-zone solution for personalized comfort
The SHARP BU DoubleZone is a multi-zone wall-mounted heat pump that allows up to two indoor units to be connected to a single outdoor unit. This model is ideal for homeowners looking to heat or cool multiple rooms independently while maximizing energy efficiency and minimizing installation costs.
Key technical specifications of the model installed in Verdun:
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Outdoor unit model: AE-X3M24BU
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Cooling capacity: 24,000 BTU/h
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Heating capacity: 26,000 BTU/h
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Heating operation range: down to -27°C
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Refrigerant: R-32 (eco-friendly and efficient)
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Energy efficiency: SEER up to 25, HSPF up to 12
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Plasmacluster technology: purifies air, neutralizes viruses, bacteria, and mold
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Hot Gas Pipe feature: prevents ice buildup on outdoor unit
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Built-in Wi-Fi for intelligent remote control
Flat roof installation: challenges met and AirGreen’s expertise
Winter context and site complexity
The installation took place in February on a snowy flat rooftop of a residential building in Verdun. These conditions required detailed planning and precise technical skills. Our technicians secured the outdoor unit on an elevated support mounted on concrete and treated wood bases to prevent snow or standing water accumulation and ensure maximum stability.
Extreme cold resistance
One of the main advantages of the SHARP BU heat pump is its ability to maintain heating performance down to -27°C, making it a top-tier solution for the harsh winters of the greater Montreal region. Thanks to its intelligent defrosting system and exclusive Hot Gas Pipe technology, the customer can enjoy consistent thermal comfort year-round, with no interruptions.
Unique SHARP technology benefits for indoor comfort
Air purification with Plasmacluster
The SHARP BU comes equipped with patented Plasmacluster technology, which releases positive and negative ions to neutralize airborne contaminants, including:
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Airborne viruses and bacteria
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Mold spores
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Household allergens
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Lingering odors (tobacco, pets, cooking)
This feature not only ensures ideal indoor temperature, but also provides exceptional air quality, a major asset for families or residents with allergies.
Intelligent control via built-in Wi-Fi
The model installed in Verdun includes built-in Wi-Fi, allowing the customer to control the temperature remotely via smartphone. Whether adjusting comfort while away, programming operating schedules, or tracking energy consumption, everything is done intuitively through the mobile app.
Final result: complete customer satisfaction and optimal performance
The client, owner of a duplex in Verdun, wanted a discreet, reliable, and energy-efficient solution to heat and cool two floors. Thanks to this SHARP BU DoubleZone wall-mounted heat pump installation, they now benefit from:
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Even comfort across multiple rooms
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Significant reduction in energy costs
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Continuously purified air quality
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A durable, eco-friendly system that meets Quebec regulations
Why choose AirGreen for your wall-mounted heat pump installation?
At AirGreen, we provide more than just an installation. We’re committed to offering tailored HVAC solutions, backed by our technical expertise, professionalism, and dedication to customer satisfaction. Whether it’s for a single-family home, an urban duplex, or a commercial building, our team customizes its approach to maximize each unit’s performance.
We proudly serve Montréal, Laval, Longueuil, as well as the entire North Shore and South Shore, where we’ve already completed hundreds of high-performance installations.
Conclusion: The SHARP BU heat pump, a four-season ally for Verdun and beyond
This installation in Verdun perfectly demonstrates the versatility and durability of SHARP wall-mounted heat pumps, especially multi-zone models like the BU series. Combined with the proven expertise of our AirGreen team, it offers a complete solution for heating, cooling, and air purification, tailored to the climatic challenges of Quebec.
Thinking of upgrading your HVAC system or installing a SHARP wall-mounted heat pump in Montreal or nearby? Trust AirGreen for a secure, high-performance, and long-lasting installation backed by flawless after-sales service.
The unit on this job, in figures
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 BU 24 0002 Zones (Dual Zone) | 25,000 | 21,200 | −27 °C: 14,600 | 2.3 | 24.0 | 11.5 | $3,000 |
| Sharp BU 24 0003 Zones (Triple Zone) | 25,000 | 21,200 | −27 °C: 14,600 | 2.3 | 24.0 | 11.5 | $3,000 |
Among the year’s most efficient according to ENERGY STAR, on top of its cold-climate certification.
Minimum certified capacity (NEEP): it slows down instead of stopping when a single room calls.
NEEP still lists 14,600 BTU/h at a COP of 1.84 at −17 °F.
Global warming potential of R-32, versus 2,088 for R-410A (ENERGY STAR).
Among the year’s most efficient according to ENERGY STAR, on top of its cold-climate certification.
Minimum certified capacity (NEEP): it slows down instead of stopping when a single room calls.
NEEP still lists 14,600 BTU/h at a COP of 1.84 at −17 °F.
Global warming potential of R-32, versus 2,088 for R-410A (ENERGY STAR).
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 big day, step by step
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 would it look like 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.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
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.
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.
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.
More jobs to see, near you
By town, by equipment or by region: browse more than 4,700 published projects.
Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Every house has its constraints. We see them before we install.
The on-site estimate is free and the quote follows within 24 hours.
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).