Installation of a Sharp ZU1 series wall-mounted heat pump in Outremont
Outremont: Installation of a Sharp ZU1 series wall-mounted heat pump by AirGreen. Positioned under molding, gravity drain, and carefully commissioned for four-season comfort in Montreal and the surrounding area.
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.
Discreet, well-thought-out four-season comfort in a Montreal apartment
At AirGreen , we design HVAC systems that combine performance, reliability, and attention to detail. In this Outremont apartment, the owner wanted a four-season solution that would provide efficient summer cooling and stable heating during the off-season, without compromising the aesthetics of a neat interior with crown molding. We recommended a Sharp ZU1 series wall-mounted heat pump (new generation with R-32 refrigerant), renowned for its efficiency, quietness, and compactness.
Client context and objectives
-
Space to be treated : communicating living areas (living room and dining area), with air circulation to be optimized.
-
Layout constraints : short wall finished with a ceiling molding ; need to maintain technical clearances while maintaining a clean visual line.
-
Expectations : very discreet wall-mounted air conditioner for everyday use, controlled operating costs and possibility of access to subsidies when the model configuration meets the ENERGY STAR extreme cold criteria.
Why the Sharp ZU1 series for this project
-
High Seasonal Efficiency : The ZU1 range offers competitive SEER/HSPF coefficients, synonymous with energy savings.
-
Inverter technology : fine modulation of the compressor to maintain a stable temperature with reduced consumption .
-
Controlled noise : particularly low interior noise levels, ideal for an apartment where living room and dining room share the same volume.
-
R-32 : new generation refrigerant fluid allowing better mass performance and a reduced charge compared to older generations.
-
Low temperature heating mode (depending on the capacity chosen): maintains power in cold weather, comfortable for mid-seasons and cool nights.
Key steps in HVAC installation
1) Implementation and template
We positioned the head under the molding , as close to the ceiling as possible while respecting the recommended clearances for suction and blowing. This placement:
-
maximizes the Coandă effect for air sweeping along the ceiling;
-
limits hot/cold air recirculation and improves uniformity in the room;
-
frees up useful wall space.
A mounting template allowed us to precisely mark the anchors while avoiding joints and structural uprights, essential in Montreal buildings with mixed frames (brick/wood).
2) Drilling and crossing
The through-hole was made with a slight outward slope (≈1/4” per foot) for gravity drainage of condensate , thus avoiding the addition of a pump and its associated noise. An insulated sheath protects the connections and eliminates thermal bridges at the wall.
3) Refrigeration connections and power supply
-
Insulated copper lines sized according to the capacity retained; controlled bends to preserve the section and oil return.
-
Communication cable routed with links for a compact and reliable harness.
-
Dedicated power supply compliant with Code (suitable circuit breaker, polarities and grounding verified), with disconnection near the outdoor unit.
4) Finishing and sealing
-
Installation of a discreet finishing cover (crossing cover) inside.
-
On the exterior (not visible here), the hoods are adjusted and sealed to withstand Montreal's harsh weather (freezing/thawing, driving rain), ensuring a lasting seal and a clean finish on the facade.
5) Vacuuming and starting
-
Deep vacuum to the recommended threshold to remove moisture and non-condensables.
-
Leak test (vacuum stability) before opening the valves.
-
Settings : calibration of the vertical sweep so that the flow runs along the ceiling before descending, optimizing the range towards the living room.
Result: tangible comfort and aesthetics respected
-
Soft and stable diffusion without annoying air currents near seating areas.
-
Silence in steady state: the unit blends into the room's atmosphere.
-
Successful visual integration thanks to the under-molding positioning and the clean lines specific to Sharp.
Technical points and good practices retained
Clearances and traffic
Placing a wall-mounted heat pump too close to an edge or piece of furniture prevents air from circulating freely. Here, the unit is offset from the corners so that the jet can spread out and cover the entire space.
Condensate management
Gravity drain is preferred whenever the configuration allows: increased reliability, zero noise, zero pump maintenance. The slope and insulation of the drain prevent frost and backflow .
Length of lines
The lines are short and straight , limiting pressure losses and optimizing seasonal performance. In condominiums, this choice also reduces intervention time and the impact on the envelope.
Vibrations and structure
Silent blocks (exterior) and adapted anchors (interior) cut off the transmission of vibrations to the walls, a crucial point in the quiet buildings of Outremont.
Maintenance and longevity
A high-performance device keeps its promises if it is maintained:
-
Clean filters every 4 to 8 weeks during peak season.
-
Annual check by our technicians: heat exchange, electrical tightening, condensate test, control of probes and fans.
-
Visual inspection of the exterior capping after winter (snow, ice, wind).
Regular HVAC maintenance extends lifespan, maintains performance, and protects the manufacturer's warranty.
Grants and eligibility (Montreal, Laval, Longueuil, North Shore, South Shore)
Several efficiency programs recognize high-efficiency wall-mounted heat pumps . Depending on the exact capacity of the installed Sharp and its certifications (e.g., ENERGY STAR and low-temperature performance), incentives may be available to reduce the net cost of the project. Our team supports the client in:
-
check the AHRI number ;
-
prepare the required documents;
-
optimize the file according to the address (Island of Montreal , Laval , Longueuil , North Shore and South Shore ).
Usage tips for optimal comfort
-
For air conditioning, favor moderate settings (22–24°C) and let the machine modulate rather than switching ON/OFF multiple times.
-
Use sweeping to extend airflow during hot weather.
-
For supplemental heating, direct the flow towards the living area and keep the doors ajar to encourage transfer.
Why AirGreen
-
Specialists in latest generation Sharp, Fujitsu, Gree, Midea wall-mounted heat pumps (R-32 / R-454B).
-
Neat and compliant installations , adapted to local realities: plexes, condos, townhouses, suburbs.
-
Complete support : capacity selection, grant procedures, scheduled maintenance and responsive after-sales service throughout Greater Montreal .
Outremont project review
This Sharp wall-mounted heat pump installation meets the initial objective: four-season comfort in a refined living space, without compromising aesthetics. Thanks to a thoughtful installation under molding, a silent gravity discharge and rigorous commissioning , the system delivers consistent, economical and discreet air—ready to face Montreal's hot summers and cool shoulder seasons.
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
Flip each card to see what we do instead.
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.
Useful pages for what comes next
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.
Tell us about your house. We come and see it for free.
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).