An essential mandate for the comfort and compliance of a high-traffic business.
At AirGreen , we recently completed a full HVAC maintenance and inspection intervention in a clothing store located in downtown Montreal , a commercial space where thermal comfort and air quality are directly linked to customer experience and staff performance.
Under a perforated ceiling typical of modern retail environments, our team worked precisely to ensure the cleanliness, safety and energy performance of the existing ventilation system , while respecting the access and time constraints specific to the retail sector.
Project context and objectives
The store had problems with irregular air circulation , particularly noticeable in passageways and near windows exposed to sunlight.
The intervention had three objectives:
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Ensuring consistent comfort for customers and staff, despite temperature variations due to large glazed surfaces.
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Preventing breakdowns before the peak summer season, a critical period for businesses.
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Verify the compliance of the ventilation system with the requirements of the Quebec Building Code and the ASHRAE standards applicable to commercial spaces.
Intervention constraints
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Limited access to the duct network, concealed above a suspended wire mesh ceiling , requires meticulous logistics for the security and protection of the merchandise.
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Limited intervention window , with work carried out early in the morning before the business opens , in order to avoid any interruption of activity.
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Coordination with existing directional lighting and fire alarm systems .
Preliminary diagnosis and studies
Our specialist technicians have carried out:
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A complete visual inspection of the ductwork and air diffusion registers.
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Flow and static pressure measurements at several points in the network to identify under-supplied areas.
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An analysis of indoor air quality (IAQ) using portable sensors (CO₂, relative humidity, fine particles).
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A record of supply and return temperatures on the air handling units and terminal sections.
The readings showed a significant accumulation of dust in some secondary ducts and an imbalance between supply and extraction flow rates.
Technical solution implemented
AirGreen proposed and carried out a complete maintenance of the ventilation network and HVAC components :
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Mechanical cleaning and HEPA vacuuming of main and secondary ducts.
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MERV 13 filter check and preventative replacement.
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Calibration of the balancing flaps to restore a uniform distribution of airflow.
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Inspection and lubrication of roof unit fans (Carrier 15-tonne rooftop).
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Reprogramming the control system to optimize operating time slots according to the store's opening hours.
Construction progress and safety
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Installation of secure perimeters around work areas with clear signage.
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Use of insulated ladders and antistatic equipment to comply with CSA Z462 electrical safety standards.
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Continuous supervision by a certified team leader for coordination with store management.
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Complete cleaning of the site before reopening, with no visible residue or dust.
Results and Key Performance Indicators (KPIs)
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+23% improvement in average ventilation flow rate in critical areas.
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18% reduction in weekly energy consumption related to ventilation cycles.
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Thermal equilibrium achieved at ±1.5 °C across the entire sales area.
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Customer satisfaction as measured by staff showed a notable increase from the first week.
Continuous maintenance and remote monitoring
AirGreen offered a quarterly preventative maintenance contract , including:
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Inspection and replacement of filters according to the actual dust load.
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Checking belts, bearings and static pressures.
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Targeted partial cleaning of sections exposed to external air inlets.
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Real-time remote monitoring of ambient temperatures via BMS interface (light building automation).
This contract allows the customer to ensure the continuity of comfort , the reduction of emergency calls and the maintenance of manufacturer warranties .
Compliance, safety and return on investment
The intervention complies with the requirements of the standards:
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ASHRAE 62.1 – Ventilation for Acceptable Indoor Air Quality
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CSA B52 – Code for Mechanical Refrigeration
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RBQ – Quebec Building Code, Chapter I, Section 6
The return on investment is estimated at less than 18 months , thanks to the reduction in service calls, energy optimization and improved customer comfort promoting longer store visits.
Grants and funding
The project was eligible for Hydro-Québec's EcoPerformance program , partially covering the reprogramming of the control and the replacement of high-efficiency filters.
AirGreen assisted the client in preparing the technical file and submitting supporting documents , simplifying the process.
Conclusion
This sales interview demonstrates AirGreen 's ability to intervene effectively in high-visibility and access-constrained environments, while delivering measurable results that comply with HVAC best practices.
Our approach combines technical expertise , operational safety and a sustainable energy vision , supporting the profitability and comfort of Montreal businesses.