Installing a Central Heat Pump Without Demolition: It’s Possible, Even in an Old Home
When it comes to installing a central heat pump in a home built in the 1950s, the initial reaction from many homeowners is the same: "It’s going to require tearing down walls." However, that’s not always the case. At AirGreen, we’ve developed an exclusive HVAC installation method without demolition, perfect for older homes where the architectural heritage must be preserved.
Our team recently proved this method during a project in Ahuntsic-Cartierville, Montréal, in a 1952 bungalow, still equipped with hot water radiators. The challenge was significant: modernizing the heating system and adding air conditioning… without altering the walls, ceilings, or the historic charm.
The Challenge: No Open Structure, No Visible Ducts
The homeowner wanted to preserve the original aesthetic of the brick bungalow, including moldings, baseboards, and intact gypsum walls. The technical constraints were numerous:
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No attic space to run the ducts
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Low ceilings in the basement
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No existing ventilation system
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Very limited space to install a central furnace and its ducts
Rather than forcing a traditional installation, we proposed a custom solution, combining intelligent engineering with compact equipment.
Our Solution: High Velocity Central Heat Pump System (Unico)
We chose a Unico High Velocity system with a Lennox Elite 3-Ton central heat pump, powered by R-32 refrigerant.
This air distribution system uses small diameter flexible ducts, ideal for older homes. It allows for heating and cooling the entire home by running the ducts through:
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Closets
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Existing drop ceilings in the basement
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Empty spaces in the corner walls
Technical Details of the Installed System
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Lennox Elite Central Heat Pump
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Capacity: 36,000 BTU (3 tons)
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SEER: 17
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HSPF: 9.5
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Refrigerant: R-32 (low GWP)
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Indoor unit: Unico high-pressure system
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Air distribution: 2-inch flexible ducts
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Eligibility: LogisVert subsidy up to $4,800
Steps for Installation Without Demolition
Our exclusive method relies on precise planning:
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Complete thermal assessment and inspection of the structure
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Determining optimal duct pathways without opening any walls
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Precise drilling in invisible spots (closet floors, ceiling corners)
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Installation of high-velocity ducts with discreet vents
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Placement of the heat pump outside, connected by camouflaged ducts
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Full system startup with calibration and pressure tests
All completed in 5 working days, with no dust or impact on interior décor.
Result: Modern Comfort with Preserved Charm
The homeowner now enjoys:
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Even comfort in both winter and summer
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A 30% reduction in electricity bills
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A discreet system, with no visible vents, no ducts
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Access to energy transition subsidies
Tips for Old Homes in Montreal and Surrounding Areas
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Always hire experts specializing in HVAC installations without demolition
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Request a personalized heat load calculation
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Ask for a complete analysis of the duct pathway
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Consider miniature duct systems for projects with limited space
Why Choose AirGreen?
At AirGreen, we don’t just install heat pumps. We solve complex constraints while respecting existing structures. Our installations in old homes across Montreal, Laval, Longueuil, the North Shore, and the South Shore prove that it’s possible to improve comfort without sacrificing style or budget.
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Custom approach, with no compromises
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High energy efficiency equipment
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Zero demolition, guaranteed results
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A team trained in heritage standards and unique residential challenges
Our Method: Innovation at the Service of Heritage
This project in Ahuntsic-Cartierville shows that with the right technology and precise expertise, modernizing a 1952 home without breaking a single wall is not only possible but optimal. At AirGreen, we believe that every home deserves a customized HVAC solution, respectful of both its history and its future.