Installation of a Sharp (ZU1 range) wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a Sharp wall-mounted heat pump (R-32) in Rosemont–La Petite-Patrie. AirGreen, HVAC expert in Montreal, Laval, Longueuil, North Shore and South Shore: clean installation, short connections, gravity drainage, high efficiency and grant support.
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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
Four-season comfort and energy efficiency: a careful HVAC installation in a Rosemont plex
In this project in Rosemont–La Petite-Patrie (Montreal) , our team is installing a Sharp ZU1 series wall-mounted heat pump , the latest generation using R-32 refrigerant . The goal is clear: to provide stable heating in winter and gentle air conditioning in summer , while reducing energy bills and ambient noise in a typical home in the area (renovated plex, gypsum partitions, standard ceiling heights). As always, we deliver a clean, durable HVAC installation designed for maintenance .
Customer context and site constraints
The owner wanted to modernize an old window air conditioner that had become noisy and energy-consuming. The living area is compartmentalized (living room and hallway), with aligned doors and lintels close to the ceiling . The ideal position for the interior head is above a passage , in order to circulate the air from the hallway and living room without creating a direct draft on the sofa. The light structure of the wall requires precise load distribution and rigorous management of drilling to avoid any vibration.
What we install: a recent Sharp, exuding efficiency
Why the ZU1 (R-32) range
Sharp 's ZU1 range is part of the recent residential series operating with R-32 , a PAG refrigerant inferior to R-410A. It combines high seasonal efficiency , low temperature heating and quiet operation . In a Montreal condo or plex, it is an excellent compromise between power, acoustics and compactness .
Key benefits for the occupant:
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Efficient heating in extreme cold (low temperature range meeting the needs of a Montreal winter).
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Fine modulation of power : uniform comfort, without thermal “yo-yo”.
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Quiet operation : ideal for open living areas and close bedrooms.
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Eco-design : R-32 = less charge and reduced carbon impact.
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Eligibility for grants when combined with the criteria of current programs (required yields/power).
Our installation method: precise, clean, durable
1) Air flow study and choice of installation point
The Sharp head is installed high, centered on the lintel , which allows:
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longitudinal diffusion in the corridor and the living room;
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obstacle avoidance (sliding and opening doors);
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easy access to the pre-filter for periodic maintenance.
We respect the manufacturer's clearances at the top and sides, guaranteeing correct sweeping and maintained nominal capacity .
2) Fixing and anti-vibration
The wall plate is anchored to the rail using fixings adapted to the support. We install anti-vibration spacers and check the level to the tenth to secure gravity drainage . Result: no parasitic noise and natural condensate drainage, without a lifting pump.
3) Short and protected refrigeration path
We make a clean, slightly inclined drilling, with a vapor barrier sleeve . The insulated copper connections (pre-flared on site) exit to the outside over the shortest possible route. Inside, a flush white capping ensures a discreet finish and mechanical protection; outside, we extend the UV-resistant technical cover to the condenser.
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Estimated length : short (a few meters), favorable for yield.
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Connections : tighten to torque, nitrogen leak test , deep vacuum (<500 microns), then charge according to the instructions.
4) Condensate management
The drain pipe follows the same slope as the copper, with an anti-odor loop and a secure outlet. In Rosemont housing, this point is crucial: a good slope avoids the need for a mini-pump and reduces maintenance .
5) Outdoor unit : silent, clear, winterized
Outside (backyard), the condenser is fixed on galvanized brackets at snow-free height , with anti-vibration pads . We provide peripheral clearance for air flow and snow protection if the environment requires it. The dedicated power cable is protected in a sheath; the service stop is accessible for maintenance.
6) Commissioning and configuration
After the electrical check , we validate the pressures , superheat/subcooling , and configure:
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automatic sweeping to push air along the corridor;
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nighttime silent mode ;
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the delivery times adapted to the customer's lifestyle.
Result: consistent comfort and reduced bill
Measurements and sensations
As soon as it is switched on, the airflow gently covers the living room . The temperature difference between rooms drops to 1–2 °C . In summer, dehumidification makes heat waves more bearable without unduly lowering the setpoint. In winter, the heat pump maintains heat without systematically resorting to auxiliary heating.
Easy maintenance, long life
We leave the owner with an HVAC maintenance plan :
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cleaning the pre-filter every 4–8 weeks;
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annual inspection (tightening, heat exchange, condensates, parameters);
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clearance of the outdoor unit (no obstruction, especially in winter).
This routine guarantees the lifespan of the device and the preservation of yields .
Subsidies and profitability: what it means for you
In Montreal, Laval , Longueuil , on the North Shore or the South Shore , a recent R-32 wall-mounted heat pump may be eligible for assistance programs (depending on power/efficiency). Our team supports:
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verification of technical criteria ;
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AHRI certificates and numbers ;
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photos/installation folder to speed up processing;
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optimization tips (insulation, caulking, use of modes).
Added to the electricity savings , these aids accelerate the return on investment .
AirGreen Expert Tips for a Condo/Plex Like This
Properly sized (BTU)
Oversizing causes short cycles and premature wear . We size taking into account: surface area, orientation , air infiltration, party wall , glazing and lifestyle habits.
Position intelligently
Above a door, beware of turbulence : we adjust the shutter angle to avoid direct airflow onto the passage and promote controlled stratification in adjacent rooms.
Take care of the invisible details
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Controlled deep vacuum : essential for compressor reliability.
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Snow guards and height : essential against frost and blown snow .
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Capping and sealing : clean finish, limited thermal bridges , preserved aesthetics.
Mistakes to avoid
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Drillings too low without slope → water returns .
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Connections too long or looped → pressure losses and noise .
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Condenser too close to the ground → frost and loss of flow in the middle of winter.
Why AirGreen? An HVAC installer based in Greater Montreal
At AirGreen , we combine applied engineering , attention to detail and field service . Our presence in Montreal, Laval, Longueuil , on the North Shore and the South Shore allows us to intervene quickly, with teams trained on Sharp, Fujitsu, Gree, Midea and other recent brands of R-32/R-454B heat pumps.
We take care of: advice , installation , commissioning , HVAC maintenance , grant applications and monitoring . The goal: reliable, quiet and economical comfort all year round.
Summary technical sheet (installation of the day)
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Equipment type : Sharp wall-mounted heat pump (ZU1 range, R-32).
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Interior installation : top of wall, above a passage , clearances respected.
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Route : short connections, slope drilling , discreet capping.
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Condensates : gravity drain with anti-odor loop.
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Outdoor unit : galvanized brackets, snow-free , easy access to the service stop.
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Quality procedures : nitrogen pressure test, deep vacuum , parameter control.
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Customer objective : 4-season comfort + lower energy costs.
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Area served : Greater Montreal (Montreal, Laval , Longueuil , North Shore , South Shore ).
And now ?
Are you considering a wall-mounted heat pump in a condo or plex in Montreal , Laval , Longueuil , on the North Shore or South Shore ? We offer a visit-evaluation , precise sizing , clear quotes , and certified installation . AirGreen will guide you from the choice of brand/model to subsidies and maintenance .
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).