Installation of a Sharp Multi-Zone BU/TU wall-mounted heat pump in Laval (Chomedey)
In Chomedey, we install a Sharp Multi-Zone BU/TU (R-32) heat pump on brackets, gravity drain, and service duct. A durable and quiet HVAC system to serve multiple areas of the home.
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.
Four-season comfort and careful installation: an HVAC system designed for a residential garage in Laval
At AirGreen , we carry out HVAC installations that combine performance, reliability and attention to detail. In Chomedey (Laval) , we have just installed a Sharp MultiZone heat pump – BU/TU series (R-32) , chosen for its stable performance in cold climates and its flexibility when it comes to serving two or three areas of the house. The context: an active residential garage (storage, tires, bicycle, electric vehicle), where we want a controlled temperature without encroaching on traffic or safety.
Why the Sharp BU/TU Multi-Zone Series?
The Sharp Multi-Zone BU/TU platform ( R-32 refrigerant) perfectly meets the needs of owners who want to consolidate multiple indoor heads onto a single outdoor condenser. Key benefits:
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Inverter modulation to adjust power according to actual demand and limit consumption.
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Extreme cold compatibility down to approximately −25°C , ideal for Greater Montreal .
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Zoned distribution : you can air condition/heat the garage and one or two living areas (workshop, basement, upper floor) with a single outdoor unit.
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Eco-responsibility : R-32 offers a lower GWP (global warming potential) than R-410A, which aligns with our energy efficiency commitments.
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Eligibility for Quebec programs when performance criteria are met (frequent scenarios with modern heat pumps ).
Technical integration: compactness, safety and longevity
Positioning and support
We fix the outdoor unit to sturdy wall brackets anchored in the concrete column of the garage threshold. This positioning:
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clears the ground for maintenance and vehicle traffic;
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elevates the condenser to protect it from snow accumulation and splashes;
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maintains proper air clearances for suction and discharge.
Anti-vibration pads reduce the transmission of structure-borne noise to the structure. The result: a quiet installation while remaining easily accessible for maintenance.
Refrigeration and electrical routing
The route of the refrigerant connections (insulated copper) and the communication cable is grouped in a vertical technical duct attached to the pillar. This choice:
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protects pipes from shocks and UV rays;
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facilitates inspections;
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guarantees respected curvature radii for the longevity of the compressor.
On the power side, we connect the device to a dedicated circuit breaker , with a nearby disconnect box and waterproof conduit . Grounding and circuit breakers strictly follow the Quebec Electrical Code .
Condensate management and defrosting
Water is drained by gravity via a dedicated pipe, with a continuous slope to prevent freezing and odor return. In winter, the heat pump's defrost function produces water: our installation height and flow path prevent puddles when tires pass over them and stalactites under the sill.
Airflows and clearances
In a garage, we scrupulously respect:
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sufficient rear clearance for suction;
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a free discharge facing the propeller;
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the absence of temporary obstacles (bags, wheels, crates) in the air corridor .
We explain to the customer where not to store items, to preserve seasonal efficiency and avoid fan overloads.
Sizing and usage scenarios: Multi-Zone for comfort
Zone smart
The BU/TU configuration allows 2 to 3 wall heads to be powered. In this project, the garage constitutes a dedicated area ; other typical areas are:
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workshop/basement : humidity and dust control;
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floor : lower thermal load in the evening thanks to flexible settings.
Each indoor head has its own remote control and time slots , in order to avoid unnecessary air conditioning/heating of unoccupied areas.
Capacity and refrigeration lines
We calculate the equivalent lengths and height differences allowed by the manufacturer. The refrigerant charge is adjusted according to the total length . A poor estimate can penalize the oil recovery and the compressor's lifespan; this is why our technicians check:
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suction/discharge pressures ;
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superheating and subcooling temperatures ;
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sealing by placing under nitrogen and deep vacuum test before releasing the refrigerant.
Results: immediate comfort, controlled noise, costs under control
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Fast heating of the garage in winter, no more cold starts and tools outside the temperature range.
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Sober air conditioning in summer, beneficial for the electric vehicle and sensitive materials (paints, glues, tires).
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Controlled noise level , thanks to silent blocks , fan alignment and compliance with clearances.
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Simplified HVAC maintenance : front access to the condenser and disconnect facilitates annual service (fin cleaning, electrical check, drain flushing).
Best practices and pitfalls to avoid (AirGreen feedback)
To do
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Keep 60 to 90 cm free in front of the condenser front;
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Clean the inner head filters every 4 to 8 weeks;
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Rinse the condenser fins with a hose (gentle flow) in spring and fall;
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Plan annual maintenance : checking the crawl space of the pipes, measuring currents , checking terminals and sensors .
To avoid
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Stacking tires, bags or tools in the airflow;
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Drill the technical duct without consulting us;
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Hiding the condenser behind mesh that is too tight: even if it is “pretty”, this restricts the flow and increases consumption;
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Let the condensate pipe freeze : if there is any doubt, we add a heating resistor or we reconfigure the slope .
Subsidies and Profitability: Where Sharp Stands in 2025
With R-32 generation and high seasonal efficiencies , the heat pump installed in Chomedey can be integrated into current energy-efficient programs when performance thresholds are met. We support our customers for:
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validate eligibility (model, capacity, climates);
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compile proof of installation (detailed invoices, photos, AHRI numbers where applicable);
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maximize financial recovery in Montreal, Laval, Longueuil, North Shore and South Shore .
Why AirGreen for your projects in Laval and Greater Montreal?
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Field expertise : single-family homes, multiplexes, condos, garages, workshops.
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Team certified on Sharp, Gree, Fujitsu, Midea , etc. platforms.
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Impartial advice : we first size the envelope, the uses and the electrical (caliber, distances, clearances).
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Clean finish : aligned capping , careful seals, sloped drilling, invisible fixings where possible.
Our goal remains constant: an HVAC installation that we forget about on a daily basis - except for the comfort and lower energy bills .
Summary sheet of the Chomedey installation
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Type : MultiZone heat pump (mini-split)
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Brand : Sharp – BU/TU series ( R-32 )
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Context : Active residential garage + expansion possibilities to 1–2 areas of the house
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Installation : wall brackets on concrete column, anti-vibration , vertical technical duct , gravity drain
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Electricity : dedicated circuit breaker, disconnect nearby, protected conduit
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Objectives : modulated heating/air conditioning , silence , maintenance access and winter reliability
For a similar project in Laval, Longueuil, Montreal, North Shore or South Shore , our team offers a rapid study (building, uses, electrical), a clear estimate, and commissioning calibrated according to the rules of the art.
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 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.
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.
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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).