Invisible Ventilation: How a Ductless Technology Is Transforming Historic Homes in Laval

Modernizing Without Compromise: The Subtle Elegance of Ductless Ventilation in Laval’s Heritage Homes

In the historic neighborhoods of Laval, where century-old homes proudly showcase original woodwork, authentic moldings, and high ceilings, installing a central ventilation system often presents a serious challenge. Cutting into load-bearing walls or modifying roof structures can compromise the building’s integrity. This is where ductless technology steps in—a nearly invisible solution that delivers exceptional air quality without altering the charm of the old.

At AirGreen, we recently completed a ductless ventilation installation in a heritage home in Laval, a project that perfectly illustrates the advantages of this technology in complex residential settings.

Why Heritage Homes Require a Tailored Approach

Homes built before the 1960s in Laval typically lack central ductwork. Adding mechanical ventilation the traditional way often involves:

• Invasive renovations (wall openings, adding drop ceilings)

• High costs due to architectural modifications

• A risk of compromising aesthetic or historical value

Ductless ventilation—usually based on discreet wall-mounted modules connected to a central unit or energy recovery ventilators (ERVs)—has emerged as a solution that respects the existing structure.

The Project: Restoring Comfort Without Compromising Authenticity

For this project in Laval, the owners of a 1927 home contacted us to solve a persistent humidity issue in the basement, along with inconsistent temperatures on the upper floors.

Our goals:

• Ensure balanced, continuous airflow across three levels

• Minimize structural interventions

• Install an aesthetic and silent solution

The Chosen Technology: Multi-Zone Ductless Ventilation

After a full structural assessment, we selected a combination of energy recovery ventilators (ERVs) hidden in technical closets and discreet wall-mounted modules positioned in the main living areas.

Technical features of the installed system:

• Brand: Zehnder ComfoAir Q350

• Type: ERV with dual-flow ventilation

• Airflow capacity: up to 350 m³/h

• High-efficiency filtration (F7 + M5)

• Sound level: under 35 dB

• Smart sensors integrated (CO2 and humidity)

This system provides balanced indoor-outdoor air exchange, with excellent energy efficiency thanks to a high-performance heat exchanger.

Discreet Installation, Maximum Efficiency

The project was completed in five days. Here are the key steps:

1. Structural analysis to avoid fragile areas in the original build

2. Localized drilling for wall-mounted modules with air intake from the attic

3. Routing cables through original moldings, without any damage

4. Airflow calibration based on the needs of each zone

5. Commissioning and sensor testing (air quality and humidity)

All of this was done without altering ceilings, without adding visible ductwork, and without impacting the period décor.

Key Benefits for the Homeowners

Since the system was activated, the occupants have noticed:

• Significantly improved indoor air quality

• More stable temperatures throughout the home

• Less window condensation

• Reduced lingering odors (kitchen, basement)

But above all: no aesthetic compromise. The installation is practically invisible to the naked eye.

Grants and Energy Efficiency

This type of system is eligible for certain local and provincial subsidies, especially for projects that improve energy efficiency in heritage buildings.

At AirGreen, we help our clients with:

• Preparing the required documentation

• Applying for LogisVert subsidies

• Evaluating energy performance before and after

Why Choose AirGreen for This Type of Project?

We specialize in complex installations in older residential environments. Our technicians are trained to:

• Work within delicate environments

• Preserve the integrity of original materials

• Provide tailored solutions, perfectly adapted to the home

Each project includes a personalized preliminary study, meticulous follow-up, and professional commissioning, complete with maintenance advice and client training.

Simplified Maintenance

Ductless ventilation requires minimal maintenance:

• Filter replacements twice a year

• Inspection of exhaust vents and air intakes every 12 months

• Occasional checkups on the sensors (CO2, humidity)

We offer custom maintenance contracts, with automated reminders and an annual preventive visit.

A Subtle but Fundamental Transformation

This project proves that Laval’s historic homes can fully benefit from modern HVAC technology without any visible changes. Thanks to ductless systems—compact and high-performing—we restore comfort while preserving the soul of these homes.

Whether you own a 1930s duplex or a century-old cottage, there is an AirGreen solution perfectly suited to your heritage reality.