Installation of a Sharp (ZU1 series) wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a Sharp wall-mounted heat pump (ZU1 series) in Rosemont–La Petite-Patrie: quiet diffusion, protected gravity drain, discreet capping and rigorous commissioning for four-season HVAC comfort.
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 HVAC installation for a comfortable, quiet and efficient Montreal living room all year round
In this typical Rosemont–La Petite-Patrie apartment, our team installed a Sharp wall-mounted heat pump (model from the ZU1 range ). The client's goal was clear: to achieve reliable heating in winter and precise air conditioning in summer , without noise or uncomfortable drafts, while respecting the aesthetics of the living room. The result: a discreet HVAC installation , integrated into the decor, providing consistent comfort room after room and concrete energy savings.
Customer context and criteria selected
The apartment features classic Montreal plex features: wood flooring , ceiling moldings , internal gypsum walls and a decorative fireplace on the implantation wall. We recommended a wall-mounted heat pump for its installation flexibility , its very good seasonal efficiency and its capacity to heat down to -25°C depending on the range.
The priority technical and usage criteria were:
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Quiet : discreet operation for an open living space.
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Heating efficiency : maintains good power when the temperature drops below zero.
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Even diffusion : high positioning to promote air circulation without disturbing the decoration.
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Visual discretion : passage of the refrigeration line and the drain in a clean and aligned manner.
Why Sharp for this project in Montreal?
The Sharp ZU1 range is appreciated for its stability in low temperature heating , its precise compressor control and its filtration quality . The interior module integrates washable fine mesh filters and the multi-speed ventilation allows the flow rate to be finely adjusted. Comfort side:
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Wide blowing with motorized shutter to push the air along the ceiling, limiting the sensation of direct jet.
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Low noise level in low mode, ideal for a living room where you talk or watch television.
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Intelligent regulation maintaining the setpoint with minimal temperature variations.
In terms of efficiency, the ZU1 family offers high seasonal returns that contribute to eligibility for grant programs in effect in Quebec, subject to official criteria. This is an asset for owners in Montreal, Laval, Longueuil, North Shore and South Shore .
Installation details: precision, protection and aesthetics
Implantation of the inner head
We fixed the unit to the load-bearing wall , approximately 2.15 m from the floor. This height:
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promotes controlled stratification (hot air remains high then gradually descends),
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frees up the furniture area (fireplace, coffee table, frames),
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maintains adequate clearances for maintenance and air circulation.
The factory drilling template was used to calibrate the anchors . The lag screws are sized according to the nature of the wall, with suitable anchors to avoid any vibration.
Drilling and crossing the wall
The 65 mm hole was drilled with a slight outward slope to allow gravity drainage of condensate. We added:
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a waterproof anti-infiltration sleeve ,
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closed foam insulation (Armaflex type) on the refrigeration pair,
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a vapor barrier tow on the inside to maintain watertightness.
If a portion of the drain is exposed to the outside, we systematically provide insulation and, when required, the addition of a heating cable to prevent freezing during thaws followed by extreme cold.
Route of the links
The routing is short and clean (back-to-back configuration). Outside, the refrigeration connections and the communication cable are protected in a discreet capping , well aligned against the facade. We ensure:
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reduce tight bends to preserve refrigerant flow,
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minimize unnecessary lengths to optimize performance,
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maintain a bending radius in accordance with the manufacturer's specifications.
Vacuum packaging and leak testing
Before the floodgates open, we have:
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Draws a vacuum to a deep level to extract moisture and air.
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Performed a prolonged vacuum test , indicating a perfectly sealed line.
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Validated the tightening torques of the flared fittings with a torque wrench.
This sequence ensures compressor longevity and stable performance over time.
Power supply and compliance
The outdoor condenser (not visible here) is powered by a dedicated circuit with a compliant circuit breaker . We always install an outdoor disconnect switch near the unit, as required by the Code. Polarity , grounding , and conductor size were verified prior to commissioning.
Results: comfort, silence and energy savings
As soon as it is switched on, the customer notices:
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a rapid rise in temperature in winter, without overheating the ceiling;
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uniform cooling in summer, with low noise level in auto speed;
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controlled consumption , the heat pump prioritizing the heating mode which is much more economical than traditional electric baseboards.
The remote control offers simple scenarios (night settings, sweeping, frost protection), useful for optimizing daily comfort.
Good practices for HVAC use and maintenance
To maintain performance and warranty:
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Clean filters every 4 to 8 weeks depending on use and the presence of animals.
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Schedule annual HVAC maintenance : pressure inspection, evaporator cleaning, drain check, electrical connection verification, parameter update.
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In winter, keep the drain outlet clear and protected from freezing.
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Avoid obstructing the unit with tall furniture or heavy curtains.
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In case of prolonged absence, activate the frost protection mode to maintain a safe temperature and limit humidity.
These simple actions extend the life of the machine and maintain optimal performance when the temperature drops.
Points of attention that we have managed for you
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Clearances : respect minimum distances around the unit to avoid air recirculation and facilitate service.
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Leveling : perfectly horizontal installation for condensate flow without stagnation.
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Vibrations : control by shimming and tightening to the torque, avoiding any parasitic noise on the partition.
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Aesthetics : discreet passage of connections, fine capping, flush interior plug and coordinated color.
Grants and financing: how to benefit from them
Efficient wall-mounted heat pumps are generally eligible for financial assistance (municipal and provincial programs). The criteria are evolving; we support our customers in:
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verify eligibility according to SEER/HSPF and low temperature performance ,
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prepare documents (invoices, AHRI numbers),
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explain the deadlines and the administrative process .
Our team takes care of the technical traceability of the installation, which speeds up the preparation of files.
Why AirGreen for your project in Montreal, Laval, Longueuil, North Shore and South Shore?
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Honest advice on BTU capacity and correct configuration (single vs. multizone ).
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Rigorous execution : vacuum drawing, vacuum holding, functional tests, fine adjustments.
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After-sales service : dedicated lines during peak periods, original parts, continuously trained technicians.
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Respect for the premises : protection of floors, clean site, careful finishing.
This installation in Rosemont–La Petite-Patrie illustrates our way of working: simple and reliable engineering , implemented with precision to provide lasting comfort on a daily basis.
Express FAQ
Can this heat pump completely replace baseboards?
In a well-insulated home, yes for most needs. However, we recommend keeping an electrical backup for extreme cold spells.
Is the noise in night mode noticeable?
At low speed , the noise level is very low. The high location further limits perception.
How long is an annual interview?
Allow 60 to 90 minutes depending on accessibility and the condition of the filters. This maintenance is very cost-effective in terms of energy savings and equipment longevity .
Conclusion
With this Sharp wall-mounted heat pump (ZU1 series) , your living room gains uncompromising four-season comfort . The installation, connection protection, drain management and AirGreen standard commissioning guarantee stable, quiet and energy-efficient operation for many years. For similar projects in Montreal, Laval, Longueuil, on the North Shore and the South Shore , our team designs and builds custom HVAC systems , ready to face the climate of Greater Montreal.
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
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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).