A Major Challenge: Integrating a Modern Air Conditioning System into a Heritage Building in Longueuil
At AirGreen, we’re used to tackling technical and architectural challenges in our wall-mounted air conditioner installations across Montréal, Longueuil, Laval, the South Shore, and the North Shore. But this particular project in Longueuil, on an officially designated heritage home, required a meticulously precise approach, strict compliance with heritage regulations, and HVAC installation expertise that few possess. This is a detailed account of a truly unique experience—technical and human—that shows our ability to combine cutting-edge technology with deep respect for architectural heritage.
A Century-Old Home with a Modern Need: Installing a Wall-Mounted AC Without Compromising the Architecture
The initial call came from a homeowner looking to improve summer comfort for his family, while adamantly preserving the historic integrity of his hundred-year-old home, located in the heart of Old Longueuil. The house was built using limestone, with hand-carved wooden cornices and non-standard window dimensions—elements that made a standard wall-mounted AC installation completely out of the question.
The objective was clear: integrate a discreet, energy-efficient, high-performance wall-mounted air conditioning system without altering the visible facades or compromising the original structure.
Equipment Selection: An Energy-Efficient, Low-Profile Wall-Mounted Air Conditioner
After a detailed assessment of the building and local regulations, we selected a 12,000 BTU wall-mounted unit from Fujitsu, model LZAH R-32, known for its quiet operation, compact size, and compatibility with delicate installations. This unit runs on R-32 refrigerant, which is significantly more environmentally friendly than older options.
Technical specifications of the installed unit:
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Brand: Fujitsu
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Model: LZAH R-32
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Capacity: 12,000 BTU
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Type: wall-mounted air conditioner with Inverter
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Indoor sound level: as low as 21 dB
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Refrigerant: R-32 (low GWP)
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Eligible for LogisVert grant: Yes, for a $1,704 credit
Installation Steps: Technical Precision Meets Heritage Respect
Inspection and Approval from the City of Longueuil
We began by conducting a full architectural survey, followed by submitting our installation plan to Longueuil’s urban planning department, including a technical report. Approval was conditional upon meeting strict criteria: no visible changes to the front facade, no drilling into original load-bearing walls, and full concealment of all ducts.
Strategic Drilling and Custom Wall Bracket
The indoor unit was installed in a former library now used as a home office. The challenge was routing the condensation and refrigerant lines without damaging the original moldings. We created a custom wall bracket, anchored in a hidden secondary lintel, to evenly distribute the unit’s weight without compromising the structure.
As for the outdoor unit, it was discreetly placed in the backyard, behind an existing wooden fence. We built a weathered wood enclosure, matching the home’s exterior finish, to fully hide the compressor from view.
Commissioning and Fine Calibration
Once the installation was complete, our certified technicians performed a full system startup, adjusting airflow, refrigerant pressure, and programming settings according to the family’s needs. The system was calibrated for ultra-quiet operation, essential in such a calm, protected residential area.
The Result: Modern Comfort Inside a Historic Envelope
The result exceeded all expectations: optimal summer thermal comfort, an invisible design, no noise detectable from outside, and a fully reversible system to maintain a stable indoor temperature during the shoulder seasons. The homeowner also received a $1,704 LogisVert grant, which significantly lowered the overall purchase cost.
Testimonial from the Homeowner
“I was really worried at first because preserving the character of my home was essential. AirGreen offered me a custom solution that respected the architecture and delivered top-tier technical quality. The result is incredible—you don’t see it, you don’t hear it, but you definitely feel the comfort.”
What This Installation Reveals About Our Approach at AirGreen
Every wall-mounted air conditioner installation project is unique, but some demand a level of execution finesse and technical knowledge far above the standard. This Longueuil project highlights our ability to:
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Adapt modern HVAC systems to strict heritage constraints
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Design custom mounting and routing solutions
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Navigate and secure necessary regulatory approvals
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Deliver an invisible, silent, and energy-efficient installation
Practical Advice for Owners of Historic Homes in Longueuil and Beyond
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Always have your building inspected before any HVAC intervention.
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Choose compact, eco-friendly wall-mounted units.
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Work with a company experienced in heritage buildings.
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Ensure your project complies with local regulations.
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Ask for tailored solutions: discreet supports, embedded ducts, hidden outlets.
AirGreen: HVAC Installations That Fit Every Reality
At AirGreen, we know that every building has its own story, its own challenges, and its own set of requirements. Whether you live in a new condo, a single-family home, or a classified property, our team will do everything necessary to design and install a wall-mounted air conditioning system that fits seamlessly.
We serve all of Montréal, Laval, Longueuil, the South Shore, and the North Shore, always with the same focus on quality, precision, and architectural respect.