Installing a Wall-Mounted Air Conditioner in an Apartment: What Tenants and Landlords Absolutely Need to Know in Québec
At AirGreen, we frequently receive inquiries from both landlords and tenants looking to install a wall-mounted air conditioner in an apartment. At first glance, it seems like a simple decision, motivated by the need for comfort during the summer heat. However, in Québec, this process is regulated by strict rules from the Housing Board (now called the Tribunal administratif du logement – TAL), which many people are completely unaware of. This lack of information can lead to disputes, denied installations, or even legal penalties.
In this article, we’ll dive into these little-known rules, while sharing our expertise drawn from numerous wall-mounted air conditioner installations done in Montréal, Laval, Longueuil, the North Shore and South Shore. Thanks to our field experience, we provide you with a clear, useful, and essential guide to avoid any unpleasant surprises.
What the Law Says: Tenant’s Rights vs. Landlord’s Rights
A Permanent Installation = Modification of the Unit
Installing a wall-mounted air conditioner, unlike a portable unit, constitutes a permanent modification of the dwelling. It requires drilling into walls, mounting an exterior compressor—often on the balcony or building facade—and running a dedicated electrical line. This reality means:
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Tenants cannot proceed with the installation without written permission from the landlord.
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Landlords can deny the installation if they believe it alters the structure, affects the building’s aesthetics, or complicates maintenance.
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Even if the tenant pays for the installation, the unit becomes a permanent fixture of the apartment, unless otherwise stated in the lease.
Article 1922 of Québec’s Civil Code
This article states that a tenant may not change the form or purpose of a rental unit without the landlord’s consent. Installing a wall-mounted air conditioner is legally considered a change, as it alters the unit's structure.
Landlord Consent: Key Clauses to Include
Before any installation, a detailed written agreement is strongly recommended, including:
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Written authorization from the landlord.
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Clarification on who is financially responsible for the installation, maintenance, and potential removal.
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A clause stating that the unit must be removed and the apartment returned to its original condition at the end of the lease if the landlord requests it.
At AirGreen, we often assist clients with drafting a model agreement to help avoid misunderstandings.
Real Case: Gree Lomo Wall-Mounted Air Conditioner Installation in Laval
Last July, we were contacted by a tenant in a 5½ unit in Laval. He wanted to install a 12,000 BTU Gree Lomo wall-mounted air conditioner, known for being efficient and economical, but his landlord was hesitant to give approval.
Challenge:
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The building was a century-old triplex with a brick facade.
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The landlord was concerned about visual changes to the front of the building.
Our solution:
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We proposed a discreet side installation, with the conduit exiting at the rear yard.
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We used white wall brackets designed for masonry and fully compliant with the building code.
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We helped draft a signed document between both parties including:
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compliance with CVAC (HVAC) standards,
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annual maintenance to be handled by the tenant,
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reversible installation.
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Result: the unit was installed in a single day, without disturbing other tenants, and with a landlord reassured by our professional approach.
What a Landlord Should Verify Before Approving an Installation
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HVAC installation plan provided by a certified contractor (like AirGreen).
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Location of the outdoor unit: noise, visual impact, access, distance from other units.
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The electrical capacity of the unit.
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Compliance with municipal bylaws (some cities require permits, especially for facade work).
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Written commitment from the tenant to cover costs and maintenance.
What a Tenant Should Ask Their Installer
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A BTU evaluation suited to the apartment’s square footage.
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A clear estimate of costs (installation and maintenance).
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Information about available subsidies, such as Hydro-Québec’s LogisVert program.
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Compact, quiet, and efficient models, like:
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Fujitsu KGL 9,000 BTU
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Gree Lomo 12,000 BTU
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Mitsubishi MSZ-GL 15,000 BTU
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At AirGreen, we always guide each client toward the best wall-mounted air conditioner or heat pump based on the apartment’s constraints and lease terms.
Subsidies and Financial Incentives for Wall-Mounted Air Conditioning
Even though grants are usually more generous for heat pumps, several efficient wall-mounted air conditioner models may qualify for incentive programs:
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Hydro-Québec’s LogisVert: up to $1,860 for certain units.
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Municipal programs (e.g., City of Longueuil).
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Tax credits for energy-efficient home upgrades.
We always include these opportunities in our equipment recommendations.
Our Practical Tips for a Successful Apartment Installation
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Start by discussing it with your landlord. Don’t commit to anything before obtaining written consent.
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Choose a certified HVAC contractor with RBQ license, insurance, and warranty (like AirGreen).
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Opt for compact, quiet, and energy-efficient models.
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Request a custom BTU report based on sun exposure, surface area, and insulation of your apartment.
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Prepare a detailed agreement outlining mutual responsibilities.
Why Choose AirGreen for Your Apartment Project
At AirGreen, we’ve built a unique expertise in installing wall-mounted air conditioners in rental properties, with over 350 projects completed across Montréal, Laval, Longueuil, the North Shore, and South Shore. Our personalized approach, deep knowledge of Housing Board regulations, and ability to reassure both landlords and tenants make all the difference.
Our team supports you every step of the way:
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Advising on the right equipment.
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Lease analysis and assistance with drafting agreements.
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Fast, clean, and code-compliant installation.
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Post-installation follow-up and annual HVAC maintenance.
Conclusion: Transparency, Expertise, and Regulation
Installing a wall-mounted air conditioner in an apartment in Québec is possible, but it requires planning, permission, and professional supervision. Ignoring the Housing Board regulations can lead to avoidable disputes.
With AirGreen, you get complete support—technical and legal—to ensure your project is a lasting, comfortable success.