A CVAC expertise put to the test in a heritage home in Montréal
In the historic heart of Montréal, a century-old home recently acquired by a young couple sought to combine modern comfort, energy efficiency, and preservation of historical charm. A mission as delicate as it was exciting—entrusted to our team at AirGreen. Their goal? To install a central heat pump that’s eco-efficient, capable of heating and cooling the entire home without altering its aesthetic or compromising its structure. Thanks to our expertise, this installation—one many would have considered “impossible”—turned into a textbook success.
An old home with very modern constraints
Installing a central heat pump in a home built in 1910 is no small feat. The ceilings are high, the load-bearing walls are thick, and the absence of existing ductwork complicates any mechanical work. On top of that, the home is designated as a heritage property, requiring complete respect for the original architecture, both inside and out. The challenge? Designing a CVAC installation that’s discreet, high-performing, and seamlessly integrated into this one-of-a-kind setting.
Choosing the right central heat pump: performance, efficiency, and subsidies
After a thorough technical evaluation, we recommended installing a Bosch BOVA 36 Premium central heat pump, an ultra-quiet system using R-454B refrigerant, recognized for its low environmental impact. This 36,000 BTU high-performance model delivers excellent heating capacity even in -25°C, while providing fast, even cooling throughout the home.
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Model: Bosch BOVA 36 Premium
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Capacity: 36,000 BTU (3 tons)
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Refrigerant: R-454B
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SEER: 20
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HSPF: 10.5
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Eligible for LogisVert subsidies: Yes – up to $6,565 potential reimbursement
A tailored installation: our step-by-step process
Step 1: Thermal analysis and constraint assessment
First, our team conducted a detailed thermal analysis of the home, room by room, to determine the actual heating and cooling requirements. We also inspected the structure, attic, spaces between floors, and utility access points to evaluate possible duct pathways.
Step 2: Designing a discreet duct network
Unlike modern homes where CVAC ducts are easily integrated, here we opted for a hybrid solution: high-efficiency flexible round ducts, installed in the attic and existing closets, avoiding any damage to original moldings, wooden lath walls, or decorative ceilings.
Step 3: Indoor unit in the attic, outdoor unit camouflaged
The air handler was discreetly installed in the attic, with a dedicated insulated access point. The outdoor unit was placed in the backyard, shielded by a wooden privacy screen painted to match the home’s exterior. Everything was approved by the borough’s heritage architecture consultants.
Step 4: Smart zoning and integrated controls
The family wanted to control comfort room by room. We integrated a zoned system with smart Ecobee thermostats, each one managing a floor. With built-in Wi-Fi connectivity, they can now adjust the home’s temperature remotely.
Client testimonial: a heritage home transformed
"We were nervous about modernizing our century-old home without ruining its character. AirGreen really listened, offered tailored technical solutions, and delivered an incredible result. The comfort is unmatched, and the house underwent no major visual changes."
— Laurence and David, homeowners – Plateau-Mont-Royal, Montréal
Why trust AirGreen for complex installations like this one?
At AirGreen, we don’t just install central heat pumps. We tailor them with precision to every environment—whether it’s a new build or a unique historic property. This project is a perfect illustration:
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Respect for architecture with no compromise on performance
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Deep technical expertise in heritage buildings
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Custom-built approach, focused on comfort and energy efficiency
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Attention to detail, both aesthetic and functional
Mistakes to avoid when installing a heat pump in an older home
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Overlooking existing insulation: A thermal analysis is crucial before starting.
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Installing without proper planning: Heritage projects require detailed technical drawings and sometimes municipal approval.
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Choosing an incompatible unit: Not every model is suited for complex installations.
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Ignoring noise considerations: In homes with thin walls or hollow floors, sound level becomes a key factor.
Practical advice for owners of older homes
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Request a free assessment from a qualified CVAC professional.
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Choose high-efficiency units with low-GWP refrigerant (Global Warming Potential).
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Look into available subsidies: many projects are eligible for partial reimbursements.
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Select an installer experienced with heritage buildings, like AirGreen.
Expertise that reaches across Montréal, Laval, and both shores
AirGreen carries out these types of projects not only in Montréal, but throughout Greater Montréal, including Laval, Longueuil, the North Shore, and the South Shore. Our teams are trained to handle the unique realities of every building type, whether it’s a century-old home in Vieux-Longueuil, a classic duplex in Laval, or a renovated cottage in Saint-Eustache.
AirGreen is more than just a CVAC installer: we’re a trusted partner to transform the thermal comfort of your home, no matter its age.