Project

Installation of a Gree Charmo wall-mounted heat pump in Ville-Marie (Montreal)

In a modern condo in Ville-Marie, AirGreen installed a Gree Charmo wall-mounted heat pump, prioritizing efficient air distribution, impeccable finish and 4-season comfort perfectly suited to the realities of downtown Montreal condos.

By AirGreen Climatisation & Chauffage Admin6 min read
Installation of a Gree Charmo wall-mounted heat pump in Ville-Marie (Montreal)
Installation of a Gree Charmo wall-mounted heat pump in Ville-Marie (Montreal)
Generic diagram: wall-mounted heat pump, indoor and outdoor units

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.

  1. 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.

  2. The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.

  3. Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.

  4. A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.

  5. The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.

  6. On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.

  7. The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.

In a modern condo in Ville-Marie , in the heart of Montreal, we recently installed a Gree Charmo wall-mounted heat pump to provide consistent comfort year-round, without compromising aesthetics or living space. This type of environment (smooth ceilings, white walls, large windows, open-concept living room and kitchen) requires a very precise HVAC approach: proper airflow direction, discreet integration, noise management, and optimized efficiency, both for cooling in the summer and heating during the colder months.

At AirGreen , we know that in downtown condos, comfort isn't just about "putting a unit on the wall." It requires good air circulation, a visually clean installation, and a system configured to perform effectively in the real-world conditions of Greater Montreal.


Why a Gree Charmo is an excellent condo choice in Ville-Marie

The Gree Charmo is a wall-mounted heat pump designed to meet the typical needs of urban homes:

  • Four-season comfort : efficient air conditioning in summer and supplementary (or main depending on the configuration) heating in cold seasons.

  • Precise control : fine temperature adjustments, useful in a condo where sunlight can cause rapid temperature changes.

  • Discreet format : a compact wall-mounted head, installed high up, which integrates well into a contemporary decor.

  • Quiet operation : a key criterion when sharing a building with neighbors and wanting to sleep peacefully.

In Ville-Marie, condos often have large windows: it's beautiful… but it increases air conditioning costs during heat waves, and it can create cooler areas near the windows in winter. A well-placed, properly sized, and well-oriented wall-mounted heat pump makes all the difference.


The installation context: open area and narrow wall to be optimized

In this project, the indoor unit was installed high up, near the ceiling , on a wall adjacent to a doorway. This type of placement is common in condos: the goal is to find a location that allows for:

  1. A good "jet" of air towards the living area (living room and dining room)

  2. A clean integration , without invading the decor

  3. Logical access for maintenance (filter cleaning, periodic checks)

We also observe a drop/soffit at the ceiling (an angled or recessed shape), typical of recent urban buildings where mechanical elements sometimes pass through. This detail is important: it influences the direction of airflow and can create recirculation if the unit is too confined. In our approach, we take these volumes into account to avoid hot/cold spots and improve the feeling of comfort.


Key installation details (what really matters)

Even though a wall-mounted heat pump may seem “simple,” a quality installation is all in the details. Here’s what we consistently prioritize, especially in Montreal condos:

1) Positioning for natural airflow

Installing the unit in the correct location allows you to:

  • uniform diffusion in the open area,

  • fewer on/off cycles

  • more stable comfort and fewer temperature fluctuations.

2) Height and clearance

By placing the wall-mounted unit close to the ceiling , you maximize the airflow range while maintaining a clean look. You also ensure that there is sufficient clearance around the unit for proper ventilation.

3) Aesthetics: integration into the decor

In a condominium, the installation must be clean:

  • clean alignments,

  • Controlled pipe outlets,

  • neat finish on the wall,

  • A discreet result that respects the interior architecture.

4) Noise management and acoustic comfort

Comfort isn't just about temperature; it's also about peace and quiet. A good installation helps to limit:

  • vibes,

  • echoes in the wall,

  • sensation of "breath" too direct.

5) Easier future maintenance

A high-performing system must remain high-performing. We keep in mind:

  • access to filters,

  • access to the drain,

  • ease of diagnosis and maintenance.


What the Gree Charmo brings to everyday life (in a condo in Ville-Marie)

In this type of space, the benefits are quickly felt:

  • Rapid and pleasant cooling during heat waves (frequent in Montreal, especially in urban areas).

  • Comfortable heating during autumn, spring, and as a supplement in winter (depending on the needs of the accommodation).

  • Better stability despite solar gains (windows, orientation, high floors).

  • Targeted comfort : air is directed towards the living area rather than being lost in a corridor or against a wall.


Common mistakes to avoid when installing a wall-mounted heat pump (condos)

In central areas like Ville-Marie , we often see facilities that “work,” but are not optimal. Here are some common mistakes:

  • Unit placed too close to an obstacle (ceiling drop, adjacent wall, tall piece of furniture): reduced air circulation.

  • Air blowing directed straight towards a resting area : discomfort (draft) despite a good temperature.

  • Poorly designed drain : risk of dripping, noise of flow or drainage problems.

  • Sloppy finish : unnecessarily exposed piping, poor alignment, "added after" look.

  • Random sizing : too small = discomfort; too powerful = short cycles, less well-managed humidity in air conditioning.

At AirGreen, our goal is to avoid these pitfalls from the outset, by adapting the choice and installation to the actual dwelling, not to a theory.


Ville-Marie: a neighborhood with its own unique characteristics HVAC

Downtown Montreal presents its own specific realities:

  • more compact or open-plan condos,

  • buildings with condominium rules (noise management, location of outdoor units, access),

  • Large windows = rapid temperature variations

  • higher aesthetic requirements.

This is exactly why a wall-mounted heat pump like the Gree Charmo , properly installed and intelligently configured, becomes a very relevant solution.


Our AirGreen approach: performance, cleanliness, peace of mind

Each project is treated as a whole: comfort, efficiency, sustainability, and integration. For a Gree Charmo installation in Ville-Marie , this means:

  • thoughtful placement of the interior unit,

  • configuration for real comfort (not just a displayed temperature),

  • special attention should be paid to noise and vibrations.

  • Careful finishing and respect for the location.

  • Simple maintenance tips to keep performance stable year after year.


Conclusion: a well-installed Gree Charmo makes for a more comfortable condo… all year round

This installation in Ville-Marie perfectly illustrates what many condo owners and tenants in Montreal are looking for: a discreet , efficient , quiet system capable of following seasonal changes without complexity.

If you are in Montreal (Ville-Marie, Old Port, Nuns' Island, Plateau-Mont-Royal, Rosemont, Verdun) or elsewhere in Greater Montreal (Laval, South Shore, North Shore) and you want a clean and efficient installation, we can guide you towards the most suitable solution for your space.

The steps

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.

Step 1 of 9The on-site estimate

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.

  1. 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.
  2. The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
  3. Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
  4. The wall openingA single opening, with the slope the drain needs to flow outside.
  5. The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
  6. Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
  7. The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
  8. Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
  9. The walkthroughRemote, modes, filters: we show you the essentials before we leave.
Your numbers

And at your place?

Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.

Size checkYour baseboards, in BTU/h
–BTU/h of installed electric heat

    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.

    Through the seasons

    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.
    And at your place?

    Which type of equipment for your project?

    Pick what looks like your need.

    Mistakes avoided

    Four mistakes we do not make

    Flip each card to see what we do instead.

    Frequently asked questions

    What people ask us about this kind of work

    12 questions
    Does a wall-mounted heat pump heat in winter?
    Yes, it heats and cools. Its capacity drops in very cold weather; the operating range depends on the model and is listed on its spec sheet.
    Wall-mounted or multi-zone: how do I choose?
    One wall head and one condenser outside: the direct solution for a room or an open area. For two to five rooms, a multi-zone puts one head in each room on a single condenser.
    Where does the outdoor unit go?
    Where it stays above the snow, clear and accessible, away from walkways. We decide it with you during the estimate.
    Are there grants?
    Depending on the model and your situation, assistance programs may apply, including Hydro-Québec's LogisVert. AirGreen checks the model number before quoting an amount. See the grants.
    Do I need a permit?
    Rules vary from city to city: location, distances, noise. See permits and by-laws, and we check for your address.
    How cold can it heat?
    It depends on the model. According to Hydro-Québec, newer models work down to a temperature between −15 °C and −25 °C, and some cold-climate models are certified lower. The minimum temperature is on each unit's spec sheet.
    How much can I save?
    Hydro-Québec says a heat pump can be up to three times more efficient than baseboards for heating in the colder months. The result depends on the house, the climate and how it is used.
    How is the LogisVert assistance calculated?
    For ENERGY STAR cold-climate certified heat pumps, Hydro-Québec lists assistance of $120 per 1,000 BTU/h of heating capacity at −8 °C. AirGreen checks the exact model before quoting an amount; only Hydro-Québec confirms the assistance granted. See the grants.
    Is it noisy?
    The sound level depends on the model and is listed in decibels on each unit's spec sheet. Location matters too: when possible, we avoid putting the outdoor unit under a bedroom window.
    The outdoor unit is covered in ice: is that normal?
    Some frost is: the unit runs defrost cycles. Never hit the ice. If the unit stays iced up or stops heating, call us.
    Does AirGreen hold the required licences?
    Yes. AirGreen holds RBQ licence 5645-9605-01, subclasses 15.8 Ventilation, 15.10 Refrigeration and 16 Electricity.
    Is the estimate free?
    Yes. The on-site estimate is free and the quote follows within 24 hours. Book my free estimate.
    Going further

    Useful pages for what comes next

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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).

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