A real-life case of HVAC ventilation failure in a commercial spa
Located in the heart of Laval, this luxurious spa had been welcoming a loyal clientele for over a decade. Offering a full range of relaxation treatments, hydrotherapy, and massage services, the establishment enjoyed an excellent reputation… until a simple ventilation issue put its entire future in jeopardy.
At AirGreen, we were urgently contacted after several staff members and clients reported headaches, nausea, and a persistent musty smell in the enclosed treatment areas. The challenge: assess, correct, and optimize the ventilation system before a health inspection scheduled just a few days later — a deadline that could have led to a temporary or permanent closure of the business.
Immediate diagnosis: an outdated and undersized ventilation system
On-site technical inspection
Upon arrival, our team conducted a comprehensive analysis of the existing HVAC system. We detected several critical issues:
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Insufficient air exchange in the wet treatment rooms.
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Moisture build-up leading to hidden mold growth behind wall panels.
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No indoor air quality sensors (CO₂, relative humidity).
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Fan motors that were non-functional or jammed in certain ducts.
Design flaws from the beginning
The original system had been designed for a small treatment salon and had never been adapted to the expansion of the facility. The result: inadequate airflow, no controlled pressure zones, and excessive noise from poorly insulated ducts.
AirGreen’s intervention: a complete ventilation network overhaul
Solutions implemented
To restore a healthy and sustainable environment, we took the following actions:
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Installed a double-wall insulated duct network to minimize thermal losses and noise.
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Installed high-efficiency energy recovery ventilators (ERVs) allowing optimal heat exchange while reducing energy consumption.
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Added smart CO₂ and humidity sensors connected to a centralized monitoring console.
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Created balanced pressure zones between treatment rooms, locker rooms, and technical areas.
Equipment installed
We chose a high-performance Lennox commercial solution:
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Brand: Lennox
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Model: Lennox Commercial ERV | High-efficiency energy recovery ventilator
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Airflow: up to 3,000 CFM
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Noise level: under 40 dB(A)
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LogisVert Grant Eligibility: eligible for a commercial ventilation subsidy up to 30%
Timelines and coordination
Our team completed the work in 3 business days, working overnight to avoid disrupting spa operations. The client was involved at every step, with a full HVAC compliance report delivered before the health inspection.
Results: optimal air quality, business saved
Immediate results post-intervention
On the very first day after our intervention:
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Ambient humidity dropped from 76% to 52%.
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CO₂ levels fell below the 600 ppm threshold.
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Clients reported a radical improvement in thermal and olfactory comfort.
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The health inspection was passed with excellent remarks.
Client testimonial
“We were on the verge of closing. AirGreen saved our business. Their HVAC ventilation expertise is unmatched. They turned a nightmare into a lasting solution.”
— Spa General Manager, Laval
What this story teaches us about commercial ventilation
Mistakes to avoid
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Never underestimate the real ventilation needs of a spa or wellness center.
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Avoid using a residential-grade system in a commercial application.
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Neglecting HVAC maintenance can cost tens of thousands in forced closures.
Practical advice
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Have your HVAC systems inspected at least once a year by a professional.
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Make sure that every specific usage area (wet zones, locker rooms, closed rooms) has its own properly sized ventilation.
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Choose smart solutions that can automatically adapt to occupancy and real-time conditions.
Why trust AirGreen with your HVAC projects in Laval and across Québec
At AirGreen, we don’t just sell machines. We build healthy, durable environments perfectly suited to your commercial activities. Thanks to our technical expertise, hands-on experience, and in-depth knowledge of Québec regulations, we guarantee reliable, energy-efficient, and long-lasting HVAC installations.
Whether you operate a spa, clinic, gym, or business with sensitive areas, we know exactly how to tailor your ventilation to meet the specific challenges of your activity.
Do you operate a business in Laval, Longueuil, Montréal, on the North Shore or South Shore and have doubts about your HVAC ventilation quality?
Contact us today for a professional assessment and avoid costly mistakes.