When Poor Insulation Undermines an Entire HVAC System: A Costly Mistake in Montréal
At AirGreen, we are often called in to fix issues caused by poorly planned or executed installations. One of the most striking cases we handled in Montréal involved a business that lost over $10,000 in heating costs over two winters due to a thermal insulation error, reminding us of a critical lesson: even the best heat pump can't perform without a properly insulated building envelope.
This technical and authentic story demonstrates how HVAC installation expertise must go hand in hand with a full understanding of the environment in which the equipment is deployed. Here, we share the details of this commercial intervention on the North Shore, the mistakes to avoid, and our concrete recommendations to prevent this type of energy loss.
The Context: A Recently Renovated Commercial Building… but Poorly Insulated
The business in question is located in a commercial building in Ahuntsic-Cartierville, Montréal. The owners had invested in a BOSCH BOVA36HDN1M20G central heat pump, a high-end 36,000 BTU unit known for its cooling and heating performance, thanks to R-410A refrigerant and IDS Premium Inverter technology.
Despite this major investment, the management noticed abnormally high heating costs, particularly during January and February. Their first instinct: blame the equipment.
AirGreen’s Diagnosis: A High-Performance System Undermined by Faulty Insulation
We were called in to perform a full HVAC system assessment. Our technicians quickly confirmed that the heat pump was functioning perfectly: proper settings, optimal airflow, quiet compressor, power consumption within expectations.
But with a thermal camera, we quickly found the root of the problem: massive heat loss through exterior walls, poorly insulated ceilings, and single-pane windows in some sections of the building.
Technical Details of the Initial Installation
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Brand and model: BOSCH BOVA36HDN1M20G
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Capacity: 36,000 BTU (3 tons)
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Technology: IDS Premium, Inverter compressor
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Refrigerant: R-410A
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LogisVert Grant Eligibility: yes
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Installed by another contractor
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Initial HVAC system cost: approximately $9,000
An Energy Loss Estimated at Over $5,000 per Winter
Based on our assessments and the electricity bills reviewed, heating-related consumption was about 60% higher than it should have been in a well-insulated building. Over two winters, the direct financial loss exceeded $10,000, not to mention the premature wear on the unit due to excessive runtime.
Our Intervention: Solutions and Fixes Provided by AirGreen
Step 1: Full Energy Audit
We conducted a room-by-room thermographic analysis to identify all the building envelope’s thermal weaknesses.
Step 2: Targeted Insulation Work
In collaboration with a specialized contractor, we coordinated the application of spray polyurethane insulation in the attic, the replacement of weatherstripping on commercial doors, and the installation of double-glazed windows on the north-facing walls.
Step 3: HVAC System Rebalancing
Once the insulation was corrected, we adjusted the operation curve of the BOSCH heat pump to better match the now-reduced energy demand. Result: a 43% drop in heating costs in the first month following the work.
Key Lessons: Mistakes Not to Repeat
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Failing to insulate properly before installing a heat pump is a guarantee of chronic underperformance.
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Choosing an HVAC contractor without commercial building experience often leads to unsuitable technical decisions.
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Overlooking thermal bridges (floor/wall junctions, window frames) can cause major losses.
Practical Tips for Commercial Property Managers
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Always have the thermal insulation of the building assessed before investing in a new HVAC system.
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Don’t focus solely on the unit’s price: consider overall performance costs.
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Prioritize trusted brands (BOSCH, FUJITSU, Lennox, etc.) and certified installers.
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Request a complete energy performance analysis, including available grants.
Why Choose AirGreen?
A Fully Integrated Approach to Commercial HVAC
At AirGreen, we don’t just sell heat pumps. We provide complete solutions, tailored to your building’s reality. This includes thermal evaluations, LogisVert grant support, insulation coordination, and of course, compliant, high-performance, durable HVAC installations.
Proven Experience Throughout Greater Montréal
Our teams specialize in commercial interventions across Montréal, Laval, Longueuil, North Shore and South Shore. We understand real-world business constraints, especially regarding deadlines, budgets, and energy ROI.
A Solutions-Oriented Customer Service
Whether you’re dealing with a breakdown, poor performance, or exploring a new system, we provide practical, fast, and reliable solutions — based on real data and recognized field expertise.