Renovating the heating system of a heritage home in Quebec is never a simple task. These projects bring unique technical, historical, and energy-related challenges that require deep HVAC expertise. At AirGreen, we’re used to tackling this type of complexity in older buildings across Montreal, Laval, Longueuil, as well as on the North Shore and South Shore. In this article, we share a real experience from the installation of a high-performance heating system in a century-old house, highlighting the obstacles we faced, the solutions we implemented, and the tangible benefits for the homeowners.
Architectural heritage to preserve—but hard to heat
Heritage homes in Quebec are architectural gems. Thick stone walls, exposed beams, original flooring—there’s no denying their charm. However, their poor thermal insulation and lack of modern ductwork pose serious challenges when integrating an efficient and cost-effective heating system.
During a recent project in a house built in 1895 in Vieux-Longueuil, we quickly realized that the walls couldn’t be pierced without compromising the structure. The goal was clear: provide optimal thermal comfort, while preserving the historic character of the home.
Initial assessment and custom planning
Before any work began, our HVAC experts conducted a comprehensive energy analysis of the home. We evaluated heat loss through walls, floors, and windows, as well as the layout of the interior spaces.
The client wanted:
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Efficient heating across all three levels of the house.
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A system that would remain invisible and preserve the visual appeal.
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Long-term energy savings.
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Access to available grants for energy-efficient renovations in Quebec.
After our evaluation, we recommended a high-performance central heat pump system compatible with concealed ductwork. We selected a Goodman R-32 unit with high efficiency, paired with a compact air handler—an ideal solution for tight spaces and older home layouts.
Technical challenges and innovative solutions
No space for traditional ductwork
In this house, traditional metal ducts were simply not an option. To get around this, we proposed a high-velocity flexible duct system, with small-diameter ducts that could be discreetly threaded through wall cavities and attic crawl spaces—without altering the historical finishes.
Outdated electrical panel
Another major issue was the electrical panel, dating back to the 1970s and unable to handle the load of a modern system. We coordinated a full electrical upgrade, working closely with a certified master electrician. This also made the client eligible for an additional grant covering part of the upgrade costs.
Noise and vibration control
Peace and quiet are crucial in heritage homes. We used anti-vibration mounts, placed the outdoor unit strategically in the backyard, and installed soundproofing insulation around the attic ducts. The result: a silent, invisible heating system, seamlessly integrated.
Results and client satisfaction
From the very first cold days after installation, the homeowners noticed an immediate improvement in comfort. Indoor temperatures remained stable throughout the home—no noise, no drafts, and no compromise to the house’s aesthetics.
Thanks to the high energy efficiency of the Goodman R-32, their heating bill dropped by almost 40% compared to their old oil system.
Moreover, the project qualified for a $5,800 grant through the LogisVert and RénoClimat programs—fully managed by our team.
Why choose AirGreen to heat your heritage home
A heritage-conscious approach
At AirGreen, we have a deep understanding of the architectural and structural constraints of older homes. Our goal is not to force the building to fit the technology, but to adapt the technology to the building, while preserving its original charm.
Local expertise and proven installations
We’ve completed similar projects in:
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Outremont, in a three-story Victorian home.
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Sainte-Rose (Laval), in a 19th-century family residence.
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Vieux-Boucherville, in a former rectory converted into a private home.
Each of these installations was custom-designed to meet the building’s energy needs, physical limitations, and the client’s visual and comfort preferences.
A full-service experience
From the initial visit to project completion, we provide:
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A thorough energy assessment.
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Custom engineering for the HVAC system.
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Grant application management for provincial and federal programs.
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Post-installation follow-up to ensure long-term performance and satisfaction.
Common mistakes to avoid in heritage homes
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Installing an oversized system that short-cycles and reduces efficiency.
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Piercing or altering load-bearing walls without structural evaluation.
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Overlooking the visual or noise impact of a visible system.
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Failing to upgrade the electrical panel before installation.
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Choosing a standard wall-mounted heat pump for a large, high-ceiling home (often ineffective for large spaces).
Practical tips for a successful heating project
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Consult an HVAC expert specialized in older buildings.
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Prioritize high-efficiency systems (SEER, HSPF).
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Take full advantage of available grants like LogisVert and RénoClimat.
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Think about the whole system (air distribution, filtration, acoustics).
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Choose a turnkey service, like the one we offer at AirGreen.
Conclusion
Upgrading or replacing a heating system in a heritage home in Quebec requires expert technical know-how and a respectful approach to architectural heritage. With our HVAC expertise, local experience in Montreal, Laval, Longueuil, North Shore, and South Shore, and unwavering commitment to customer satisfaction, we are the ideal partner for these types of complex projects.
At AirGreen, we take on the unique challenges that heritage buildings present by delivering tailored, high-performance, discreet, and long-lasting heating solutions.