Choosing the right multi-zone heat pump for a damp basement in Montréal is not something to take lightly. Excessive humidity, temperature fluctuations, lack of natural ventilation, and the particular architectural design of basements in Montréal homes all require tailored solutions. At AirGreen, we recently completed an exemplary installation that perfectly showcases our expertise, our ability to match equipment to client needs, and our commitment to providing long-lasting, high-performance HVAC solutions throughout the Island of Montréal, as well as the North Shore and South Shore.
A Typical Montréal Context: A Basement in Search of Comfort and Health
In this project, our client lived in the Ahuntsic-Cartierville neighbourhood in Montréal. Their single-family home had a semi-buried basement, typical of buildings from the 60s and 70s, with a high humidity level, especially during spring and fall. Despite using a portable dehumidifier, the rooms remained uncomfortable: a sticky feeling in the air, stale air, and unstable temperatures, particularly in the summer months.
Our mandate was clear: to recommend and install a multi-zone heat pump capable of efficiently cooling the basement while improving ventilation and air quality—without compromising aesthetics or taking up precious living space.
Strategic Equipment Selection: Fujitsu Airstage Multi-Zone + KMTB R-32
After a complete analysis of the layout, insulation, thermal losses, and specific ventilation needs, we recommended the installation of a Fujitsu Airstage wall-mounted multi-zone heat pump with two indoor KMTB R-32 units—one for the 22 m² family room and another for the adjacent 15 m² office.
Why this choice?
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R-32 Technology: A refrigerant with low global warming potential, offering better energy efficiency while being more eco-friendly.
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Multi-zone Capability: Allows for independent temperature control in each zone with just one compact outdoor unit.
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Quiet Operation: Fujitsu KMTB wall-mounted units are known for their whisper-quiet performance, perfect for a basement used for leisure and remote work.
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Advanced Filtration: High-density air filtration system, highly effective at capturing humidity, fine particles, and odors—a major plus for damp basements.
Installation Details: A Technical Challenge Mastered
The installation required a precise technical approach. Here are the key points:
Structural Wall Analysis
The basement walls, made of poured concrete and partially covered in drywall, required special mounting hardware with anti-vibration dampers. We used anti-vibration insulation plates to limit sound resonance, which is especially important in enclosed environments.
Drilling and Refrigerant Line Routing
The outdoor unit was installed in the side yard, out of sight, on an insulated concrete slab. Refrigerant lines were routed through sealed wall ducting, with low-radius curves to optimize flow and minimize pressure loss.
Condensate Drain Management
In a damp basement, condensate drainage is a major concern. We installed a silent lift pump system with a level sensor, connected directly to the existing floor drain. This setup prevents any standing water buildup.
Timeline and Coordination
The project was completed over two days:
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Day 1: Equipment delivery, installation of indoor units, routing of refrigerant lines.
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Day 2: Electrical connections, leak testing, commissioning, and personalized remote setup.
Results: Optimized Comfort, Humidity Under Control
Just a few days after the installation, our client called us to express their complete satisfaction. Perceived humidity had dropped dramatically, and the indoor air became fresher, drier, and more comfortable. The wall units blend discreetly into the rooms, and the lack of noise contributes to a calm and pleasant atmosphere.
Independent control of the two zones allows for tailored temperatures based on room usage: office at 23°C, TV room at 21°C. Thanks to the system’s efficiency, the heat pump runs in eco mode at low speed, reducing overall energy consumption.
Grant Eligibility: A Cost-Effective Installation
This Fujitsu multi-zone R-32 heat pump installation qualifies for Hydro-Québec’s LogisVert program, allowing the client to receive a $1,670 rebate. We handled the entire administrative process, simplifying everything for the client and maximizing their return on investment.
Tips for Choosing the Right Multi-Zone Heat Pump for a Basement
For any homeowner in Montréal, Laval, Longueuil or nearby (North Shore, South Shore) considering equipping their basement with a multi-zone HVAC system, here are a few recommendations:
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Choose models using R-32 technology for better efficiency and maximum rebate potential.
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Go with a multi-zone setup if several rooms require different temperature settings.
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Make sure condensate drainage is properly managed to avoid residual moisture.
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Call on local experts who understand the unique challenges of Québec basements.
Why Trust AirGreen?
At AirGreen, we don’t just install equipment. We provide tailored, durable solutions that meet the highest HVAC performance standards. Thanks to our trained team, high-quality equipment, and responsive customer service, we support each client from system selection through post-installation service.
Our expertise spans the entire Greater Montréal area, with fast, efficient service in Laval, Longueuil, Brossard, Repentigny, Terrebonne, Saint-Bruno, Blainville, and many other regions. Whether it’s for a basement, duplex, condo, or commercial building, we have the skills and solutions you need.