Project

Installation of a Gree wall-mounted heat pump in Rosemont–La Petite-Patrie

In Rosemont–La Petite-Patrie, AirGreen installed a Gree wall-mounted heat pump in a finished basement to provide 4-season comfort, from economical heating in winter to silent air conditioning in summer, all with a neat installation perfectly integrated into the room.

By AirGreen Climatisation & Chauffage Admin7 min read
Installation of a Gree wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a Gree wall-mounted heat pump in Rosemont–La Petite-Patrie
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 Rosemont–La Petite-Patrie, many families have transformed their basements into true living spaces: family rooms, TV areas, playrooms, or waiting areas for guests. This is precisely the case with this project, where our client wanted to make a large basement room more comfortable, both in summer and winter, without sacrificing aesthetics or floor space.

To meet this need, we recommended and installed a high-efficiency Gree wall-mounted heat pump , perfectly suited to the realities of Montreal's climate.


The context: a multi-purpose room to be heated and cooled

The room in question is a large rectangular room in the basement, with:

  • Suspended ceiling typical of finished basements;

  • Wall clear from top to bottom, ideal for accommodating a wall unit;

  • Light furniture (row of wooden chairs, waiting area / relaxation corner);

  • Light-colored flooring that reflects natural and artificial light well.

Before our intervention, the part suffered from two classic problems :

  1. Marked coolness in winter , especially near exterior walls;

  2. Stagnant heat in summer , difficult to remove without a dedicated air conditioning system.

Our objective was therefore twofold:

  • Ensuring 4-season comfort for the whole family;

  • Integrate the solution discreetly and harmoniously into an already furnished space.


The chosen solution: a high-efficiency Gree wall-mounted heat pump

We recommended the installation of a Gree wall-mounted heat pump of approximately 12,000 BTU , an ideal capacity for this type of room in the basement.

Four-season comfort for the Montreal climate

The chosen Gree wall-mounted heat pump allows for:

  • Efficient heating in winter , even during the marked cold typical of Montreal;

  • Precise air conditioning in summer , with excellent humidity control;

  • Dehumidification mode is practical in the mid-seasons, when the air becomes heavy without it being really hot.

Thanks to variable speed compressor (inverter) technology, the machine automatically adjusts its power according to the needs, which allows:

  • A stable temperature , without sudden variations;

  • Optimized energy consumption , therefore reduced electricity bills compared to electric baseboards alone.

Silence and comfort in a living room

In a room used for relaxation or entertaining guests, noise is a key factor. The installed Gree wall-mounted heat pump offers:

  • Very quiet operation in normal mode;

  • A “silent” mode that is particularly appreciated when the room serves as a TV corner or a quiet waiting room;

  • A gentle and even distribution of air throughout the room.


A neat and discreet installation

The photo clearly shows that the indoor unit is placed high up, just below the suspended ceiling , centered above a row of chairs. This positioning is not accidental.

Optimal positioning of the indoor unit

We have chosen:

  • A clear wall , without tall furniture or obstacles;

  • A generous installation height , allowing the air to mix better before descending;

  • An airflow direction oriented slightly forward , to avoid a direct draft on seated persons.

Result: the room is well air-conditioned and heated, while guaranteeing maximum comfort for the occupants .

Connection routing and condensate management

Although it's not visible in the photo, a large part of our work takes place behind the wall:

  • Refrigerant lines (insulated copper) carefully covered and routed to the outside;

  • Condensate drain installed with an adequate slope to allow gravity drainage of water produced in air conditioning mode;

  • Sealing and insulation of the wall penetration to prevent air and cold infiltration.

When gravity doesn't allow it, we can add a discreet condensate pump . In this project, the basement configuration allowed us to maintain a simple and very quiet solution.

Aesthetic integration into the room

The compact, white Gree wall unit blends perfectly into:

  • The pale grey paint on the wall;

  • The clear suspended ceiling ;

  • The warm wooden furniture retains all the character of the room.

We always ensure that our installations are as discreet as possible : no exposed cables, no visible ducts in the living area. The goal is for the heat pump to blend into the decor, without dominating it.


The advantages of a Gree wall-mounted heat pump for a house in Rosemont

Choosing a Gree wall-mounted heat pump in Rosemont–La Petite-Patrie means investing in a solution that ticks several important boxes.

Energy efficiency and savings

Compared to purely electric baseboard heating:

  • The heat pump uses 1 kWh of electricity to provide up to 3 kWh of heat (and sometimes more), depending on the conditions;

  • Energy bills decrease significantly, especially if the room was previously difficult to heat;

  • In summer, air conditioning is also more economical than a portable or window air conditioner.

Comfort in the Quebec climate

Montreal's climate, with its significant temperature variations between January and July, demands versatile systems. The Gree wall-mounted heat pump offers:

  • An extended operating range in heating;

  • Precise management of temperature and humidity ;

  • A gradual start that avoids heatstroke or chills.

For our client in Rosemont, the feeling is immediate: the room is comfortable from the morning in winter and remains cool even during heat waves.

Simple control and accessible maintenance

The machine comes with an intuitive remote control . Depending on the model, it is also possible to add a Wi-Fi module for remote control via an app.

Maintenance-related:

  • The washable filters are easily accessible by opening the front panel;

  • We recommend regular cleaning of the filters (every 4 to 8 weeks depending on usage);

  • Regular professional maintenance helps keep the heat pump performing at its best and extends its lifespan.


Our approach at AirGreen

At AirGreen, we don't just "install a machine." We support our clients every step of the way:

  1. Needs analysis : room dimensions, actual use, insulation, presence of a basement, orientation, etc.

  2. Recommendation of the right Gree device : capacity, options, noise levels, compatibility with current subsidy programs.

  3. Compliant and clean installation : compliance with electrical and refrigeration standards, upgrades, complete functional tests.

  4. Explanations to the customer : how the modes work, tips to maximize energy savings, good maintenance practices.

  5. After-sales service : technical support, maintenance reminders, rapid response in case of problems.


Are you looking for a Gree wall-mounted heat pump in Montreal?

If you live in Rosemont–La Petite-Patrie, Montreal, or elsewhere in Greater Montreal (Laval, North Shore, South Shore) and you wish to:

  • To heat a basement or a large room more efficiently;

  • Replace or supplement your electric baseboard heaters;

  • Enjoy quiet air conditioning in the summer;

We can offer you a tailor-made solution with a Gree wall-mounted heat pump , installed with the same attention to detail as in this project.

Contact us at AirGreen for a free assessment of your situation. We'll help you choose the right capacity, location, and ideal configuration for your home.

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

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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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