A complete HVAC reinstallation project that changed everything in a North Shore home
At AirGreen, we regularly step in to correct poorly designed or inappropriate HVAC installations, often carried out without a proper thermal assessment or a real understanding of Québec’s climate. That was exactly the case for this project in Sainte-Thérèse, on the North Shore, where a client was dealing with poor winter comfort, sky-high electricity bills, and a central heat pump system that simply wasn’t doing its job.
Here we share the real story of an HVAC system redo, including the initial mistakes, our diagnosis, the solutions implemented, and most importantly, the concrete results delivered after our intervention.
An undersized central heat pump hastily installed
The client had previously installed a 24,000 BTU entry-level central heat pump, connected to a rigid duct system left over from an old electric furnace. The installation, completed by a contractor without proper certification, had several major technical flaws:
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Insufficient BTUs to heat a 1,800 sq. ft. two-storey home.
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Poorly distributed ducts, causing cold zones upstairs and overheating downstairs.
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Improper plenum configuration, leading to unbalanced airflow.
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No energy optimization, and not compatible with available subsidies.
The result: rooms at just 17 °C in winter despite the system running constantly, disturbing noise in the ducts, and higher energy consumption than the old baseboard heating.
Our HVAC audit: the AirGreen method
From the very first visit, our certified technicians conducted a complete assessment of the existing setup. Our process included:
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A personalized heat load calculation based on insulation, orientation, and square footage.
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Precise airflow measurements room by room.
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Analysis of the actual performance of the compressor and blower.
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Verification of LogisVert subsidy eligibility.
It quickly became clear that the existing system had no chance of providing efficient and economical heating in this typical North Shore home.
The AirGreen solution: new Bosch heat pump and full duct system overhaul
We recommended installing a Bosch BOVA 36,000 BTU R-454B central heat pump, a high-performance, Energy Star–certified model capable of maintaining a comfortable indoor temperature even at -26 °C.
Work performed:
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Complete removal of the existing system, including uninsulated ductwork.
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Design and installation of a new insulated flexible duct network, with an optimized plenum.
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Airflow balancing per room using damper registers.
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Installation of a multi-zone smart thermostat compatible with the Inverter compressor.
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System setup to optimize energy consumption during cold spells.
Results: comfort, savings, and subsidies
Within the first week of use, the results were clear:
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Stable, even temperature in all rooms, including upstairs.
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Reduced noise levels thanks to insulated ducts and variable-speed compressor.
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Electric bill down by 37% in the first month.
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Confirmed eligibility for the LogisVert program, with a $2,172 subsidy applied to the project.
The customer expressed high satisfaction and recommended our services to several neighbors in the area.
Why choose AirGreen for an HVAC reinstallation?
We don’t just fix mistakes — we give our clients the comfort they deserve. Whether you’re in Montreal, Laval, Longueuil, on the North Shore, or the South Shore, our teams:
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Perform professional and transparent HVAC audits.
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Offer custom solutions, based on your home and priorities.
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Work with trusted brands like Bosch, Fujitsu, Goodman.
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Guarantee a certified HVAC installation, up to the highest standards.
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Optimize each project to maximize your ROI and access to government subsidies.
Don’t wait for winter to realize your system was poorly installed. Contact AirGreen today for a free evaluation, and bring back the comfort your home deserves.