A Custom HVAC Installation in the Heart of Montréal’s Residential Heritage
In the vibrant Hochelaga neighbourhood, where the charm of old buildings meets today’s demands for energy efficiency, we recently tackled a highly technical challenge: the full installation of a central heat pump in a century-old triplex, without altering the building’s historic structure. This project perfectly reflects our meticulous approach, our expertise in HVAC, and our ability to provide customized solutions for Montréal homes with unique architectural character.
Understanding the Context: A Century-Old Triplex with a Delicate Structure
The property, located on a typical Hochelaga street, featured a wooden structure over 100 years old with the classic vertical layout: basement, ground floor, and upper level. This type of building generally lacks centralized mechanical space or existing ductwork, presenting a major challenge for installing a central heat pump system.
We were therefore tasked with delivering an energy-efficient solution, discreet and compatible with the architectural reality of the building, while also meeting the comfort needs of all three units.
Choosing the System: A Two-Stage Central Heat Pump, LogisVert Eligible
After a full analysis of heating and cooling loads, available space, and electrical constraints, we recommended installing a Goodman two-stage compressor system, using R-32 refrigerant, known for its performance in cold climates and its low environmental impact. This model stood out for several reasons:
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Capacity: 36,000 BTU, perfectly suited for a Montréal triplex
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Superior energy efficiency, with a SEER of 18 and an HSPF exceeding Hydro-Québec’s standards
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Eligible for the LogisVert program, allowing co-owners to receive a subsidy of up to $5,000
Installation Process: Precision, Safety, and Heritage Preservation
Initial Inspection and Planning
Our HVAC technicians began with a thorough inspection: load-bearing walls, unused chimneys, false ceilings—everything was reviewed to identify the most non-invasive duct routes. The goal: minimize openings, preserve original moldings, and reduce intrusive work as much as possible.
Central System Installation
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Outdoor unit discreetly installed in the backyard on an insulated slab, with anti-vibration weatherproofing to eliminate noise issues
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10 kW electric central furnace fitted into a former basement closet repurposed as a mechanical room
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Custom-made galvanized steel ductwork, locally manufactured, running through ceiling cavities without affecting the interior aesthetic
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White supply and return grilles with a sleek design, adapted to each level to ensure even heating and cooling distribution
Electrical Integration and Safety
The heat pump’s wiring was integrated into the existing 200 A panel, with grounding redone and certified breakers added. Carbon monoxide detectors were also installed in each unit to ensure maximum safety.
Challenges Faced and Technical Solutions
1. Sagging Floors and Limited Access:
We used specialized portable cutting tools to run ducts without damaging the century-old joists.
2. Poor Insulation:
We recommended and coordinated with a partner the addition of blown-in cellulose insulation in the attic to boost system efficiency.
3. No Proper Return Air Path:
A smart air return system was designed using hallway wall cavities to centralize air return on each floor without invading living spaces.
Client Testimonial
“We were afraid a central system would ruin our triplex’s character, but AirGreen integrated the heat pump flawlessly. We feel the difference—quiet, comfort, and savings.”
— Mr. Leblanc, owner-occupant
Concrete Benefits for the Occupants
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Estimated 35% reduction in Hydro-Québec bill
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Stable indoor comfort even at -25°C thanks to Inverter technology
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A central system that’s quiet and invisible
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Increased property value due to major energy improvements
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No loss of indoor space, unlike multiple wall-mounted units
Why Choose AirGreen for Central Heat Pump Projects in Montréal
We don’t just install equipment. We design sustainable HVAC solutions, precisely adapted to every building. Whether you own a triplex, condo, or older rental property, our team is trained to work in complex and heritage environments.
We serve the entire Greater Montréal area, including Hochelaga, Rosemont, Villeray, Laval, Longueuil, the North Shore and the South Shore.
Maintenance Tips and Next Steps
We offer a custom annual maintenance plan, including:
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Inspection of the furnace and compressor
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Duct sealing check
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Filter cleaning
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Smart thermostat calibration
Proper maintenance can extend the life of your central heat pump to over 15 years while maximizing energy savings.
Contact AirGreen: Trusted HVAC Expertise in Montréal
Own an older building and want to equip it with a high-performance, subsidized central heat pump system that respects its architectural integrity? Do like our clients in Hochelaga: contact AirGreen today.
Our experts will answer all your questions and offer a detailed, free quote tailored to your needs.