Home » Some of Our Service Calls in Greater Montreal » Replacement of window air conditioners with a wall-mounted system in Hochelaga-Maisonneuve (Montreal)
Remplacement de climatiseurs de fenêtre par un système mural à Hochelaga-Maisonneuve (Montréal)
Reading time: 4'

Replacement of window air conditioners with a wall-mounted system in Hochelaga-Maisonneuve (Montreal)

An old building, several inefficient window units: a typical case in the heart of Montreal

In the Hochelaga-Maisonneuve neighborhood, several apartment buildings still suffer from a common problem: aging window air conditioners that struggle to maintain a comfortable temperature while consuming a lot of electricity.
At AirGreen , we were commissioned by the owner of a three-story red brick building to replace several window units with a modern, more efficient and safer wall-mounted air conditioning system .

Initial state: a network of outdated window air conditioners

During our initial inspection, the building presented:

  • Six separate window units , installed on different floors, all of various brands and over ten years old.

  • Loud noise caused by compressor vibrations.

  • Air infiltration around poorly insulated frames.

  • Excessive power consumption , aggravated by the simultaneous use of several independent devices.

The owner, aware of these shortcomings, was looking for a sustainable and uniform solution for the entire building, without altering the aesthetics of the facade or disturbing the tenants during the work.

AirGreen Diagnosis: a transition to a multisplit wall system

Our experts recommended the complete replacement of the window units with a GREE brand MultiZone wall-mounted heat pump , chosen for its robustness, discretion and exceptional energy efficiency.
This type of system allows several rooms to be served with a single external compressor , considerably reducing:

  • The outside noise,

  • Energy consumption,

  • Annual maintenance costs,

  • And the risks of water or air infiltration linked to window openings.

Installation steps: a planned construction site to minimize disruptions

  1. Gradual removal of old window units and complete insulation of openings with sealed insulating panels.

  2. Interior wall installation of new compact and quiet high-efficiency units.

  3. Discreet drilling of the rear brick wall for the passage of refrigeration pipes, carefully concealed by aesthetic trunking.

  4. Installation of the external compressor on a damped wall mount, in order to reduce vibrations and comply with the noise standards of the City of Montreal.

  5. Electrical connection certified by a master electrician who is an AirGreen partner.

  6. Complete performance and leak testing before system recommissioning.

Results: improved comfort and energy efficiency

After just two days of work, the entire building benefited from a high-performance, quiet MultiZone wall system , perfectly suited to the tenants' needs:

  • 40% reduction in electricity bill ,

  • Almost zero interior noise ,

  • Stable temperature in each accommodation ,

  • No visible alteration on the brick facade , thanks to a professional finish.

The owner was also able to benefit from the ÉcoPerformance grant program offered by Transition Énergétique Québec, applicable to the replacement of inefficient equipment with high-efficiency heat pumps.

AirGreen expertise for multi-unit buildings

At AirGreen, we have developed a specialized approach for multi-unit buildings in Montreal and the surrounding area.
Our interventions combine:

  • Logistics planning adapted to access constraints,

  • Smooth coordination with tenants ,

  • And complete RBQ and CCQ compliance .

We also offer an annual preventative maintenance service for these multi-unit systems, ensuring the durability and performance of each installation.

A sustainable and aesthetic solution for urban neighborhoods

Replacing window air conditioners with wall-mounted systems isn't just about comfort—it's also an aesthetic and energy investment :

  • Cleaner and more uniform facade,

  • Reduction of street noise,

  • Elimination of cold air infiltration in winter,

  • Immediate real estate valuation.

This project perfectly illustrates the residential energy transition taking place in Montreal's historic neighborhoods, where red brick meets modern technology.

To remember

  • Type: Replacement of window air conditioners with MultiZone wall-mounted heat pumps

  • Brand: GREE

  • Location: Hochelaga-Maisonneuve (Montreal)

  • Problem: Inefficient, noisy, and energy-consuming appliances

  • Solution: Installation of a high-efficiency MultiZone wall system

  • Result: Uniform comfort, reduced noise, energy savings

Trust AirGreen to modernize your comfort

At AirGreen , we support building owners throughout Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore , in the transition to modern, quiet and efficient HVAC systems.
Our tailor-made solutions adapt to each building, each budget and each energy need.