Unmatched Performance in the Heart of Montréal’s Winter
Professional installation of a SHARP BU DoubleZone wall-mounted heat pump in Parc-Extension, Montréal. Guaranteed comfort down to -27°C, air purification with Plasmacluster, R-32 refrigerant, and eligible for LogisVert grants.
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.
In the vibrant and densely populated neighbourhood of Parc-Extension, Montréal, where winter conditions can be harsh, our team at AirGreen recently completed a remarkable installation of a SHARP BU DoubleZone wall-mounted heat pump. This project not only reaffirmed our expertise in residential HVAC across the city but also showcased the outstanding performance of SHARP systems when facing Québec’s intense winters. Mounted on an elevated stand, this outdoor unit now stands strong against the elements, ensuring optimal thermal comfort for our client year-round.
A Winter Challenge Successfully Met by AirGreen
Installing a heat pump on a flat roof in the middle of February, right in Parc-Extension, involves several logistical and technical considerations. Snow accumulation, freezing winds, and limited access all require meticulous planning. Our team used a galvanized steel raised base, providing sufficient clearance above the snow—crucial to prevent air intake obstructions and maintain the performance of the outdoor unit.
We anchored the entire system using heavy-duty brackets, protecting it from shifting due to freeze-thaw cycles, and we shielded the refrigerant lines and wiring from the elements. Thanks to our attention to detail, this system delivers maximum performance down to -27°C, a feat made possible by SHARP’s advanced technology.
SHARP BU DoubleZone Wall-Mounted Heat Pump: Technology, Comfort and Durability
Technical Features of the Installed Model
The SHARP BU DoubleZone system, part of the AE-X3M24BU series, is designed to provide multi-room comfort while maintaining consistent performance—even in freezing temperatures. This multi-zone model can connect up to three indoor units, perfect for homes with multiple comfort zones.
Key Specifications:
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Heating capacity: up to 26,000 BTU/h
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Heating operating range: -27°C to +24°C
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Eco-friendly refrigerant: R-32, with low global warming potential
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Energy efficiency: SEER 25, HSPF up to 12
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Exclusive Plasmacluster technology: air purification via ionization
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Whisper-quiet: Sound levels as low as 23 dB(A)
Built-In Air Purification with Plasmacluster
This installation also stands out for its ability to clean indoor air. Thanks to SHARP’s Plasmacluster technology, this heat pump neutralizes viruses, allergens, mould, and persistent odours, an essential feature in dense urban environments like Parc-Extension.
Smart Features and Connectivity
This model is Wi-Fi enabled and can be controlled remotely through a mobile app. It also automates cycles based on occupancy, using an optional motion sensor on some indoor units, while providing energy consumption reports—ideal for households mindful of their carbon footprint.
Why This Installation Sets a Standard in Montréal
Meeting the Needs of a Dense Residential Sector
The Parc-Extension neighbourhood, known for its cultural diversity and compact urban planning, requires HVAC solutions that are high-performing, quiet, and discreet. The SHARP BU DoubleZone meets all these criteria, fitting seamlessly into tight environments while delivering even thermal comfort across multiple rooms.
An Energy-Efficient System Eligible for Government Grants
Thanks to its R-32 refrigerant and high-efficiency inverter compressor, this system reduces energy consumption while maintaining stable output. Additionally, this heat pump qualifies for Hydro-Québec’s LogisVert grants, making it a smart investment for homeowners looking to improve energy efficiency.
AirGreen’s Expertise Working for You
A Team Trained for Québec’s Climate
Our certified installers are trained to handle Montréal’s winter realities. We understand the challenges of installing wall-mounted heat pumps on rooftops, including managing snow, frost, and defrosting systems. Our best practices ensure continuous operation down to -27°C, offering unmatched reliability.
Complete Support: From Quote to Optimization
At AirGreen, we guide our clients from start to finish—choosing the right model, assessing specific needs, helping with grant applications, flawless installation, commissioning, and preventive maintenance. For this Parc-Extension project, we also advised the client on optimal indoor unit placement and advanced remote control use for improved air distribution.
Key Takeaways from This Installation
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Location: Parc-Extension, Montréal
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Machine: SHARP BU DoubleZone wall-mounted heat pump
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Capacity: 24,000 BTU/h cooling, 26,000 BTU/h heating
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Exceptional performance down to -27°C
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Raised, secure, winter-optimized installation
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Advanced Plasmacluster air purification technology
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Eco-friendly R-32 refrigerant
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Eligible for energy efficiency grants
At AirGreen, every installation is custom-tailored, with close attention to technical details, client comfort, and long-term system durability. This project in Parc-Extension is a perfect example: a top-tier solution, reliable and fully adapted to Montréal’s climate.
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.
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.
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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).