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Installation of a Coaire wall-mounted air conditioner in Rosemont–La Petite-Patrie

AirGreen installs a Coaire wall-mounted air conditioner in Rosemont–La Petite-Patrie. An efficient and discreet HVAC solution for condos and apartments in Montreal.

By AirGreen Climatisation & Chauffage Admin2 min read
Installation of a Coaire wall-mounted air conditioner in Rosemont–La Petite-Patrie
Installation of a Coaire wall-mounted air conditioner 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.

An HVAC installation adapted to urban comfort

At AirGreen , we recently installed a Coaire wall-mounted air conditioner in a condo located in Rosemont–La Petite-Patrie , a lively and dense neighborhood in Montreal where space optimization is essential. The client wanted to modernize their interior comfort by opting for a discreet, efficient wall-mounted system adapted to the constraints of urban housing.

Project background

The apartment featured a typical Montreal condo layout: large bay windows letting in plenty of natural light, but also significant heat in the summer. The main challenge was to provide a quiet and efficient HVAC system , while integrating the installation aesthetically, without encroaching on the limited wall space.

Technical details of the installation

  • System type : wall-mounted air conditioner (mini-split).

  • Brand : Coaire.

  • Interior location : fixed high up in the main living area, to optimize air distribution.

  • Piping Route : The refrigeration connections were carefully routed to the exterior using a discreet finishing cover, matching the color of the walls for an aesthetic finish.

  • Condensate management : drainage is carried out by gravity, avoiding the use of a pump and thus reducing future maintenance.

  • Working height : installation at the top, requiring precise fixing to ensure perfect alignment.

Benefits for the customer

  • Immediate comfort : a stable and pleasant temperature, even on hot July days.

  • Respected aesthetics : discreet integration of the interior unit without harming the wall decoration.

  • Energy Savings : Coaire wall-mounted air conditioner technology allows for lower consumption compared to older portable or window systems.

  • Quiet operation : ideal for working from home and movie nights in a condo.

Why a wall-mounted air conditioner in Rosemont?

In urban areas like Rosemont–La Petite-Patrie , installing a wall-mounted air conditioner is a great solution:

  • Little space available for central systems.

  • Facades and load-bearing walls are often narrow.

  • Need a compact, quiet and efficient device, suitable for Montreal condos and multiplexes.

AirGreen Expertise

Our RBQ certified technicians always ensure to offer:

  • Installations that comply with Quebec HVAC standards .

  • Precise planning of drilling and technical routes to minimize visual impact.

  • Comprehensive support, including maintenance advice and performance optimization.

Maintenance tips to extend the lifespan

  • Regularly clean air filters to maintain efficiency.

  • Annual check of electrical and refrigerant connections.

  • Professional inspection recommended before each summer.

By choosing AirGreen for this project, the Rosemont client benefits not only from a high-performance wall-mounted air conditioner, but also from a tailor-made service , designed for sustainable comfort in an urban environment.

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

    GrantsAssistance programs in effectAirGreen checks your model before quoting an amount.PermitsYour city’s rulesLocation, distances, noise: what changes from city to city.InstallationOur installation serviceGreater Montréal and Montérégie.

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    • RBQ licence5645-9605-01 · 15.8, 15.10, 16
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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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