Installation of a Gree wall-mounted heat pump in a workshop in Saint-Laurent
Installation of a Gree wall-mounted heat pump in a workshop in Saint-Laurent. AirGreen offers reliable HVAC solutions for Montreal, Laval, Longueuil, North Shore, and South Shore.
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An HVAC installation project adapted to a technical workspace
At AirGreen , we understand that heating and cooling needs aren't limited to homes. Many workshops, warehouses, and technical spaces also require optimal thermal comfort to ensure productivity and protect stored equipment. Recently, our team installed a Gree wall-mounted heat pump in a workshop located in the Saint-Laurent borough of Montreal . This environment presented unique challenges related to ceiling height, shelving layout, and existing electrical constraints.
This achievement perfectly illustrates our expertise in the light commercial HVAC sector in Greater Montreal.
The characteristics of the installed wall-mounted heat pump
The Gree wall-mounted heat pump chosen for this workshop offers a power of 12,000 BTU , ideal for efficiently regulating a space of 30 to 40 m² such as a single-story workshop. Its main features include:
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Inverter technology for intelligent modulation and reduced consumption.
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Heating function down to -25°C , perfectly suited to the Montreal climate.
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Built-in air filtration , reducing dust and particles in an environment where technical equipment is stored.
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Quiet operation , essential in a workshop where concentration is necessary.
This range is also eligible for certain energy subsidies under Quebec's LogisVert program when used in a residential context. Even though in this specific case it was a professional workshop, the same energy efficiency benefits remain.
Technical challenges encountered and solutions provided
Wall space management
The workshop had numerous metal storage shelves occupying almost all of the walls. Therefore, it was necessary to identify a strategic location allowing smooth air circulation without hindering access to the tools. The indoor unit was installed above the entrance door , maximizing the use of available vertical space.
Drilling and passage of connections
The refrigerant and electrical lines were discreetly routed through the rear wall. Our team used white capping to visually harmonize the installation and protect the pipes from impact and dust.
Condensate management
Given the configuration of the space, we opted for gravity drainage to the exterior, thus avoiding the addition of a condensate pump and reducing the risk of additional maintenance.
Integration into the existing electrical system
The proximity of the electrical panel made it easy to connect the heat pump, while complying with RBQ electrical standards. A dedicated circuit breaker was added to ensure the safety and compliance of the installation.
Results achieved and customer satisfaction
As soon as it was switched on, the workshop owner noticed a rapid stabilization of the temperature . In the summer, the space benefits from uniform air conditioning, preventing heat buildup around the equipment. In the winter, the heating not only allows for better working conditions, but also protects electronic equipment and sensitive tools from humidity and excessive cold.
The customer also appreciated:
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The speed of the intervention (installation carried out in a single day).
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The cleanliness of the site despite the environment loaded with materials.
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Advice provided by our team on regular HVAC maintenance , including filter cleaning and annual refrigerant checks.
Why choose AirGreen for an HVAC installation in Montreal?
Our expertise is not limited to residential properties. We work in:
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Workshops and professional spaces requiring thermal regulation.
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Downtown condos and apartments .
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Single-family homes on the North Shore and South Shore.
With a personalized approach, we guarantee:
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RBQ compliant installations .
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Solutions optimized for comfort and energy savings.
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Responsive after-sales service adapted to the specific needs of each customer.
The job tools
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
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).