Installation of a Sharp ZU1 wall-mounted heat pump in Chomedey (Laval)
In Chomedey (Laval), AirGreen is installing a Sharp ZU1 wall-mounted heat pump : galvanized slab support, capped connections, exterior disconnect, and gravity drain. Neat workmanship and four-season performance for Greater Montreal.
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 careful exterior installation for four-season comfort, designed for suburban homes in Laval
In this project in Chomedey (Laval) , we are installing a Sharp ZU1 wall-mounted heat pump designed to efficiently cool in the summer and provide stable heating support in the winter. The home has vinyl siding, a narrow side yard, and a utility passageway along a fence: a typical Laval home context. Our goal: a durable, clean, and quiet HVAC system that facilitates HVAC maintenance and protects both the building and equipment.
Why the Sharp ZU1 range is suitable for Laval's residential needs
Everyday performance and comfort
The Sharp ZU1 heat pump stands out thanks to its inverter technology, which finely modulates the compressor speed. The result:
-
stable indoor temperature, without roller coaster;
-
reduced consumption thanks to extended cycles at low speed;
-
controlled noise level, both on the condenser side and on the wall head side.
Adapted to the climate of Greater Montreal
Defrost algorithms and intelligent outdoor fan management promote reliable heating during Laval's cold weather. In summer, the high-efficiency heat exchanger provides rapid cooling , useful during periods of heat and humidity.
Qualities of use appreciated by occupants
-
Washable filters and easy access to the exchanger for seasonal cleaning.
-
Clear remote control and automatic functions (restart, night mode).
-
Frequent eligibility for energy efficiency programs in Quebec, depending on configuration and certified performance.
Design and implementation: the technical choices that make the difference
Condenser positioning: breathe, last, stay discreet
We place the outdoor unit on a raised galvanized support , anchored to a stable slab . This riser:
-
protects the device from splashes, leaves and snow accumulation;
-
improves air circulation on the suction and discharge sides;
-
limits vibration transmission to the ground and the facing.
The clearance from the fence and the vinyl wall is calculated to respect the standard spacings and maintain a clear service corridor during maintenance.
Refrigerated and electrical path: clean, short and protected
-
Refrigeration lines insulated (closed-cell foam) and covered in UV-resistant sheathing up to the connection box.
-
External disconnect box installed within reach of the technician for safety and maintenance.
-
Power wiring in approved conduit, with proper grounding and dedicated circuit breaker at the main panel.
-
Optimized link length to preserve seasonal efficiency and cold weather capacity.
Condensate management: worry-free, summer and winter
The indoor unit's condensate drain discharges by gravity, with an air seal and a continuous slope to prevent backflow. During defrosting, water from the condenser flows into the grassy area, away from the foundations.
Building protection and sustainability
-
Drillings made with sleeve and external slope; waterproofing carried out with vinyl-compatible sealant.
-
Stainless steel fasteners and galvanized surfaces to prevent corrosion.
-
Anti-vibration pads under the support to reduce structure-borne noises perceptible inside.
Commissioning: AirGreen rigor
Controlled start procedure
-
Nitrogen test and leak test.
-
High vacuum to 500 microns, stabilization and humidity control.
-
Checking electrical connections, currents and temperature differential.
-
Remote control settings (Auto/Heat/Cool modes, speeds, timer).
-
Reading of supply/return temperatures and fine adjustments.
Result obtained at the customer's premises
-
Rapid drop in relative humidity during heat waves.
-
Efficient supplemental heating during the off-season, reducing the use of the main system.
-
Discreet exterior noise level for the courtyard and immediate neighborhood.
Inside: integration of a discreet wall head
Thoughtful location
The interior head is positioned in the living area, high up, away from obstacles (curtains, tall furniture). This choice:
-
maximizes air diffusion without direct air current;
-
improves probe reading;
-
simplifies access for HVAC maintenance (filters and exchanger).
Finishing and capping
The connections (refrigerator + communication + drain) are grouped and covered with a matching profile. On the outside, the outlet angle respects the slope of the drain; on the inside, the passage is clean and discreet, without visible staples.
Directions for use for maximum effectiveness
In air conditioning (Laval, humid summer)
-
Set a stable setting (23–24°C) and let the heat pump modulate; frequent variations increase consumption.
-
Use Auto speed: the algorithm manages the airflow according to the load.
-
Clean filters every 4–6 weeks during the season.
As additional heating (winter)
-
Keep the unit clear of snow; allow a 60 cm clear area around the condenser.
-
Avoid covering the appliance: the ZU1 manages its defrost cycles automatically.
-
Combine with home sealing practices (weatherstripping, thresholds) to benefit from the full potential.
Annual maintenance recommended
Preventive maintenance – electrical inspection, deep cleaning of exchangers, drain checks and parameter verification – extends service life, secures performance and prevents summer breakdowns.
Points of vigilance that we eliminate from the design stage
-
Vibrations : rigid support and buffers adapted to the weight of the ZU1; tightening to the torque.
-
Water : outward sloping holes, vinyl-friendly flashing and sealants.
-
UV and weather : UV-rated sheaths and insulation; stainless steel fixings.
-
Service : clearances respected to access valves, disconnection and electronic cover.
Grants and possible procedures
Recent high-efficiency wall-mounted heat pumps , such as the Sharp ZU1 , are generally eligible for energy efficiency incentives in Quebec, depending on the housing configuration, the chosen power and the certified performance. At AirGreen, we support homeowners in Montreal, Laval, Longueuil, the North Shore and the South Shore in preparing files, proof of installation and supporting documents.
Why Chomedey Homeowners Choose AirGreen
-
Specialists in HVAC installation in tight residential contexts (side yards, fences, technical passages).
-
Documented commissioning methodology, focused on cold climate reliability.
-
Local after-sales service and parts available quickly.
-
Clear advice on HVAC usage, maintenance and grant applications.
Site sheet – highlights
-
Type: single-zone wall-mounted heat pump .
-
Brand / range: Sharp ZU1 .
-
Installation: condenser on raised galvanized support placed on slab ; standard clearances from the wall and fence.
-
Route: UV insulated refrigeration connections, clean external capping ; optimized length.
-
Electrical: Disconnect box within reach, approved conduit, dedicated circuit breaker.
-
Condensates: gravity drainage with air seal; defrosting management away from the foundations.
-
Finish: Anti-vibration pads, vinyl-compatible sealants, clear labeling for maintenance.
Need a similar solution in Laval and surrounding areas?
Whether in Chomedey , Sainte-Rose or Duvernay , we evaluate on site the optimal location of the condenser, the height of the support, the passage of the connections and the necessary protections. We provide a detailed quote with personalized recommendations (BTU power, filtration options, energy saving strategies) for lasting comfort, summer and winter.
At AirGreen, the promise is simple: a precise, aesthetic HVAC installation designed for longevity in Greater Montreal.
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 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 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).