Installation of a Sharp BU Double Zone Heat Pump in Nun's Island
Discover how AirGreen's Sharp BU Double Zone Heat Pump installation in Nun's Island combines cutting-edge technology, energy efficiency, and comfort, all while making the most of available 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.
Elevating Comfort with Dual-Zone Precision on Nun’s Island
At AirGreen, we understand the importance of creating a perfectly balanced indoor climate, especially in homes like those on Nun’s Island, where the seasons bring dramatic changes. Our recent installation of the Sharp BU Double Zone Heat Pump showcases how modern HVAC systems can offer both versatility and cutting-edge efficiency, providing ideal comfort for every room in the house, no matter the weather outside.
Project Overview
For this project, our client requested a robust solution that could easily handle Montreal’s chilly winters and scorching summers. We installed a Sharp BU Double Zone Heat Pump system, featuring a 24,000 BTU compressor and two indoor units with 12,000 BTU capacity each. This powerful system was an excellent match for the open, modern architecture of the home, which demanded efficient climate control without sacrificing energy efficiency. And with Quebec’s energy grants, this installation became a much more accessible investment in long-term comfort and savings.
Why the Sharp BU System?
Sharp has a stellar reputation for delivering cutting-edge home comfort technologies, and the BU model is no exception. This double zone system offers:
- Exceptional energy efficiency: With a 24.0 SEER rating, homeowners can expect lower energy bills and reduced environmental impact.
- Winter-Ready Heating: Capable of heating even when temperatures dip to a chilly -27°C, this heat pump ensures cozy warmth in the coldest conditions.
- Whisper-Quiet Operation: With a sound pressure level of only 50.0 dB(A), it provides powerful heating and cooling without adding noise pollution to the living space.
- Future-Proof Design: The system can be expanded to accommodate up to three zones, offering flexibility for future needs.
The Installation Process
Nun’s Island is known for its sleek modern homes, and we wanted this installation to reflect the aesthetics and functionality of the space. Our expert team worked meticulously to ensure that the indoor units blended seamlessly with the home’s interior design. The client was concerned about energy efficiency and wanted to take advantage of local energy grants, so we made sure that the system met all the criteria for both Hydro-Québec’s LogisVert grant of $3000 and the federal grant of up to $5000.
We placed the Sharp 12,000 BTU units strategically—one in the main living area and another in the master bedroom—to provide tailored comfort. This arrangement allows the homeowner to control the temperature in two separate zones, ensuring optimal comfort throughout the house.
Advanced Features: Efficiency Meets Innovation
The Sharp BU Double Zone Heat Pump goes beyond traditional HVAC expectations, integrating advanced features that enhance both comfort and convenience. One standout feature is the use of R-32 refrigerant, which is not only better for the environment but also improves the system’s overall efficiency. This refrigerant has a much lower global warming potential (GWP) compared to older refrigerants, contributing to the system’s green credentials.
- WiFi Control: Included in the system is built-in WiFi connectivity, allowing homeowners to control the heating and cooling settings remotely. Whether you're heading home from work or managing temperatures from your bed, the Sharp BU system makes it easy.
- Quiet but Powerful: Operating at only 50 dB(A), the system remains unobtrusive while delivering consistent comfort.
- Energy Star® Certified: The Energy Star® certification guarantees energy savings, making the Sharp BU system a smart choice for both the environment and your wallet.
Ready for Every Season
Montreal’s winters can be harsh, but the Sharp BU Double Zone heat pump is more than capable of handling extreme cold. With its heating capacity rated down to -27°C, the system provides reliable warmth even during the harshest winters. On the flip side, the cooling capacity of 24,000 BTU ensures that the home remains comfortably cool during the city’s hot and humid summers.
For this installation, we leveraged Sharp’s patented HOT GAS PIPE system, which prevents ice buildup on the outdoor unit. This is crucial for maintaining efficiency and avoiding downtime, ensuring the system runs smoothly regardless of the weather.
Optimizing Space with a Sleek Outdoor Unit
The exterior compressor unit was mounted at the back of the property, out of sight from the main living areas. This 33.47 x 13 x 27.94 inch unit, although compact, delivers the full 24,000 BTU capacity without intruding on the outdoor aesthetics. This is particularly important in modern neighborhoods like Nun's Island, where curb appeal matters.
The outdoor unit’s low-profile design, combined with its 50 dB(A) operation, ensures minimal disturbance to both the homeowners and their neighbors. The R-32 gas used for cooling is not only energy-efficient but also aligns with global environmental standards, reducing the home's carbon footprint.
Easy Eligibility for Grants
One of the most appealing aspects of this installation is the eligibility for significant rebates and incentives. The Hydro-Québec LogisVert grant provides up to $3000 in savings for systems like the Sharp BU, and homeowners can also take advantage of a federal grant worth $2500 to $5000. These grants make it easier for clients to invest in high-performance, energy-efficient systems like the one we installed on Nun’s Island.
Long-Term Comfort and Peace of Mind
Every Sharp BU Double Zone Heat Pump installation comes with an extensive 10-year warranty on the compressor, parts, and labor, ensuring that our clients enjoy peace of mind for years to come. This commitment to reliability and longevity is a hallmark of our installations, as we strive to provide solutions that are both durable and easy to maintain.
Moreover, the self-cleaning feature of the indoor units further enhances the longevity of the system by reducing dust and allergen buildup, keeping the indoor environment clean and healthy without constant maintenance.
Conclusion: Tailored Comfort for Every Season
The installation of the Sharp BU Double Zone Heat Pump on Nun’s Island is a prime example of how we at AirGreen combine cutting-edge technology with meticulous attention to detail. This system not only provides energy-efficient heating and cooling but also improves indoor air quality, thanks to its Plasmacluster technology and easy integration with WiFi for remote control.
By choosing a system like the Sharp BU, homeowners are investing in long-term comfort, reduced energy bills, and environmental responsibility. We’re proud to have delivered yet another high-quality installation that ensures our clients can enjoy their home in total comfort, regardless of the weather outside.
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).