Installation of a ComfortStar Inverter wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a ComfortStar Inverter wall-mounted heat pump in Rosemont–La Petite-Patrie: wall mount, anti-vibration mounts, clean casing and accessible disconnect. AirGreen, HVAC experts in Montreal, Laval, Longueuil, North Shore and South Shore .
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 reliable and neat upgrade for a Montreal brick duplex
At AirGreen , we work daily on typical residences in Greater Montreal . This HVAC installation was carried out in a brick duplex in Rosemont–La Petite-Patrie , a popular area for its bright apartments and semi-buried basements. The client's objective was clear: to stabilize the temperature all year round with a high-performance wall-mounted heat pump , without weighing down the facade or obstructing basement openings.
Project context and choice of equipment
The owner wanted a simple, reliable and energy-efficient inverter system, capable of providing supplemental heating in winter and efficient cooling in summer . The solution chosen: a ComfortStar Inverter (outdoor unit visible in the photo) coupled with a wall-mounted indoor head placed in the main living area. This type of equipment perfectly meets the needs of a Montreal home: fine modulation , silence , optimized consumption and reduced HVAC maintenance when properly installed.
Exemplary exterior layout: clearances, support, protection
Wall support and decoupling
The outdoor unit is mounted on galvanized wall brackets , sized for the load and span. We added anti-vibration pads (blue visible on the bolts) to separate the compressor from the masonry. The result: less sound transmission inside and increased longevity of the seals.
Height and clearances
The positioning ensures sufficient ground clearance for snow and vegetation . This height also limits dust extraction and facilitates defrost drainage in heating mode. The side and rear clearances are maintained to optimize fan air circulation .
Electrical Safety and Service
Under the unit, we have integrated an accessible service switch (disconnect) . This standardized electrical safety feature allows for any maintenance work by disconnecting the power supply on site. The electrical routing follows a protective, weatherproof, covered wiring .
Management of refrigeration connections: cleanliness, sealing and durability
Harmonized cover and controlled drilling
The refrigerant lines (insulated copper), the communication cable and the condensate drain are gathered in a discreet white capping , laid horizontally then vertically up to the inner head. We always make a single hole with a hole saw, slightly inclined outwards to prevent any water return. A weatherproof sealant and a finishing ring ensure the watertightness of the crossing.
Controlled length and bends
The length of the path is optimized to reduce pressure losses and maintain the nominal performance of the heat pump . The tube bends are made with a spring or a bender to avoid any pinching and to protect the refrigerant .
Site constraints: basement window, mixed facade and old brick
The chosen wall has a basement window and a transition of materials (brick above, plaster/parging below). The installation was designed to:
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Maintain natural light in the basement: the unit is offset and raised so as not to obstruct the opening.
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Preserve the masonry : seals made in the joints where possible and anchors suitable for the brick, avoiding cracks.
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Anticipate winter : orientation allowing the unit to be quickly cleared in the event of snow accumulation; no direct obstacles in the way of blowing.
Interior integration: homogeneous comfort and air circulation
The interior wall head is positioned so that the airflow covers the living room and reaches the corridor leading to the bedrooms. The return is unobstructed and the shutters are adjusted to avoid drafty areas. In heating mode, the vertical sweep sends the tempered air downwards to homogenize the temperature at occupied height.
Expected performance and best practices for use
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Inverter Modulation : the device adapts its power to actual demand, reducing starts/stops and improving seasonal efficiency .
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Air conditioning efficiency : adequate sizing for a rapid reduction in the sensible load during Montreal heat waves.
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Additional heating : excellent complement to the main systems; modulation limits consumption peaks .
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Controlled noise : the combination of anti-vibration pads + rigid support + clearances gives a very low exterior noise level.
HVAC Maintenance: What We Include and What the Customer Can Do
Professional maintenance recommended
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Annual check : pressures, temperatures, superheating/subcooling , tightness of connections, defrosting operating test.
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Cleaning the condenser : fins, fan, drain pan; checking the condensate pump if necessary (this project operates by gravity on the inside).
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Hood inspection : ensure integrity against UV and freeze/thaw cycles.
User interview
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Clean the inner head filters every 4 to 8 weeks during peak season.
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Minimum clearance of 60 cm around the outdoor unit, regular mowing, leaf removal.
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Gentle de-icing in winter if necessary, never use metal tools on the fins.
Simple HVAC maintenance , applied regularly, extends lifespan and maintains performance .
Points of attention when installing a brick facade
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Drilling and sealing : avoid joint cracks, respect the bed lines, injection of masonry-compatible sealant .
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Thermal bridges : limit crossings; properly insulate the copper to prevent condensation in the hood.
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Water management : Plan the de-icing path away from walkways and steps to limit black ice .
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Vibrations : Use pads and tighten to the recommended torque ; recheck after 2–4 weeks of operation.
Grants and Eligibility: How We Do It
Grants vary based on provincial programs and the certified efficiency of the appliances. Our team verifies, for each project, the efficiency class , the cold operating range and potential eligibility (e.g., programs focused on seasonal efficiency and cold climate). When replacing less efficient equipment, we inform the client of the required procedures and documents . This administrative support is part of our service in Montreal, Laval, Longueuil, North Shore and South Shore .
Result obtained for the client
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Stable comfort in the living area, with rapid response in air conditioning.
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Discreet noise level , both for occupants and for the neighborhood.
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Clean facade : aligned hood, harmonized colors, units and cables perfectly held .
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Immediate maintenance access : disconnect under the unit, compliant clearances, simplified service .
AirGreen Tips for a Successful Project in Greater Montreal
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Choose the location before the device : efficiency depends first of all on the path of the connections and the diffusion of air .
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Anticipate winter : ground clearance, defrosting evacuation, snow guard if necessary.
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Take care of the waterproofing : a clean, inclined and sealed hole prevents humidity and losses.
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Plan for maintenance : access to filters, accessible disconnect , UV-resistant covers.
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Check eligibility for assistance programs with an AirGreen advisor : a good file reduces the total cost of ownership.
AirGreen expertise serving Rosemont–La Petite-Patrie and Greater Montreal
Our team is adept at handling Montreal plexes , old masonry , and narrow courtyards . Each HVAC installation is sized , documented , and guaranteed by certified technicians. We operate in Montreal , Laval , Longueuil , on the North Shore and the South Shore , with the same high standards: meticulous aesthetics , measured performance , and available after-sales service .
For a wall-mounted heat pump project – ComfortStar, Gree , Fujitsu , Midea , Sharp or others – we offer a technical visit and a detailed quote .
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.
And at your place?
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.
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.
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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?
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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).