A literary treasure in danger: when a ventilation error puts history at risk
In a quiet neighborhood in Longueuil, inside a heritage building housing a private collection of rare books, one simple technical detail nearly led to an irreversible disaster. What was meant to be a routine update to the HVAC ventilation system turned into a critical emergency, requiring immediate and expert intervention by our team at AirGreen. Here’s the full story of a project where every second counted — and where our know-how made all the difference.
The context: a private library in an old building in Longueuil
The client, a passionate collector of antique books, contacted us after noticing several alarming signs:
-
Unusually high humidity in the storage rooms.
-
Manuscript pages beginning to warp.
-
A persistent musty odor, especially on warm days.
The ventilation system had just been installed by another company, yet the situation was only getting worse. Despite modern equipment, something was clearly wrong. Our mission: assess the entire ventilation network, identify the problem, and deliver an immediate, lasting, and precise solution — all while protecting the integrity of the space and its priceless contents.
Diagnosis: a botched installation with disastrous consequences
From our very first technical visit, several issues became clear:
-
Improper duct placement: the exhaust vents were placed too far from sources of moisture, especially in corners where stale air accumulated.
-
No humidity regulation: no humidity sensors had been installed — a critical component in any archive room.
-
Inadequate airflow: no airflow calculations had been done based on room volume or building insulation.
Our custom solutions to protect the collection
At AirGreen, we responded immediately with a technically rigorous approach that respected the building’s heritage. Here are the key actions we took:
-
Installed humidity and temperature sensors, connected to a smart control system.
-
Completely reconfigured the duct network, adding exhaust vents in the most vulnerable areas.
-
Integrated a built-in HVAC dehumidifier from Fantech, connected to the main system.
-
Calibrated the system with airflow adapted to the density of the books, considering their sensitivity to both dry and humid air.
Discreet work in a delicate environment
The challenge wasn’t just technical. We had to work:
-
Without moving any rare books or disrupting their organization.
-
Without drilling into heritage walls.
-
Without noise or dust, since some volumes dated back to the 17th century.
Our technicians used low-vibration equipment, flexible ventilation sleeves, and worked during off-hours to avoid disturbance. We also provided a museum-grade intervention certificate to reassure the client’s insurance provider.
The result: a preserved collection and a relieved client
A few weeks after installation, the monitoring reports confirmed the success of our intervention:
-
Humidity stabilized at 45%, ideal for preserving old paper.
-
Temperature maintained between 18 and 20°C, day and night.
-
Complete elimination of odors, mold, and condensation issues.
The client, impressed by our professionalism and discretion, also entrusted us with the annual preventive maintenance of the entire HVAC system.
What this story teaches us about ventilation mistakes to avoid
This project highlights several critical mistakes that must absolutely be avoided, especially in sensitive environments:
-
Installing a ventilation system without a prior study of the site.
-
Ignoring the specific needs related to the space’s purpose (e.g., archives, galleries, museums).
-
Failing to control humidity, even though it’s essential in many cases.
-
Underestimating the importance of properly calculated airflow.
At AirGreen, we always insist on a complete analysis before any installation, because every building is unique — and every HVAC system should be too.
Why trust AirGreen for your HVAC projects in Longueuil and the South Shore
We’re not just installers. We’re technical advisors, trusted partners, and above all, HVAC experts passionate about our work. Our services cover the entire Greater Montréal area, including Longueuil, Laval, the South Shore and the North Shore, with unwavering attention to quality, safety, and energy performance.
Our teams are trained to work in all types of buildings:
-
Private residences.
-
Commercial and office spaces.
-
Heritage or historical buildings.
-
Cultural centers or institutions.
Facing a ventilation issue or planning to modernize your HVAC system?
Contact us today. At AirGreen, we deliver durable, quiet, and efficient installations, always tailored to your specific needs. A bad installation can be costly — a good one can save treasures.