The truth about multizone heat pumps based on our real-world field experience
At AirGreen, we’ve installed, repaired, and maintained hundreds of multizone systems across Montréal, Laval, Longueuil, the North Shore, and the South Shore. This type of wall-mounted heat pump is becoming increasingly popular among homeowners, property managers, and contractors thanks to its energy-efficient versatility. Yet, there are still many myths surrounding this kind of system.
Our objective today is clear: to separate misconceptions from real-world facts, based on what we’ve encountered firsthand. Whether you’re a homeowner looking for tailored comfort or a professional seeking an efficient solution for multiple zones in your building, this article provides valuable, verified insights drawn from our expertise.
Understanding what a multizone heat pump really is
Multizone heat pumps, also known as multisplit systems, allow you to connect several indoor units to a single outdoor compressor. Unlike traditional single-zone systems, they offer the ideal solution for multi-storey homes, duplexes, or divided commercial spaces.
Each indoor unit can be controlled independently, allowing for better energy management and personalized comfort in every room.
Myth #1: A multizone heat pump uses more energy than a single-zone system
False. When properly sized, a multizone heat pump is more efficient than a series of single-zone units. Why? Because a single high-efficiency compressor manages multiple zones, which reduces energy loss.
At AirGreen, we recently installed a Gree Multizone 36,000 BTU system in a duplex in Laval, with three indoor units spread over two floors. The result: a 28% reduction in monthly energy consumption compared to their old electric setup.
Myth #2: Multizone systems underperform in harsh Québec winters
Again, false. As long as you choose a model designed for Québec’s cold climate, performance is excellent. Brands like Fujitsu, Gree, and Mitsubishi offer certified units that operate at -25°C and even lower in some cases.
A real-world example: installation in Boisbriand, on the North Shore, of a Fujitsu KWT multizone system (27,000 BTU) with three wall-mounted heads. Even during the January cold snap (-29°C with wind chill), the system maintained stable indoor temperatures without the need for auxiliary heating.
Myth #3: A multizone system is harder to maintain
Partially true. It’s true that a multizone system requires more thorough HVAC maintenance, particularly because of the number of indoor units. However, when properly installed and inspected yearly, the upkeep costs are comparable to a set of single-zone units.
At AirGreen, we recommend a full annual maintenance check: cleaning filters, checking refrigerant pressure, inspecting drains, and calibrating the compressor. This extends your system’s lifespan while keeping it running at peak energy performance.
Myth #4: Installing a multizone system is prohibitively expensive
Not necessarily. The cost of a multizone system depends on the number of zones, the model selected, and the building’s layout. Yes, the upfront cost is generally higher than a single-zone unit, but it’s often more economical than installing multiple separate systems.
Plus, several grants and incentives may apply, particularly under Hydro-Québec’s LogisVert program. One client in Brossard who had a 24,000 BTU Gree Extreme multizone heat pump installed (2 indoor heads) received a $1,860 subsidy.
The real benefits of a multizone system according to our experts
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Customized comfort: each zone is set to the desired temperature.
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Sleek outdoor design: only one compressor outside reduces visual clutter.
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Improved energy efficiency: smart regulation based on actual room use.
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Long-term solution: with proper maintenance, lifespan can exceed 15 years.
Typical installation by AirGreen: Case study in Longueuil
Project: Replacing an old electric central heating system with a Bosch BOVA 36,000 BTU multizone heat pump with four wall-mounted heads.
Challenges encountered:
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Limited access to the electrical panel.
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Needed to reroute refrigerant lines to avoid load-bearing walls.
AirGreen solutions:
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Installation of a secondary smart breaker to avoid panel overload.
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Use of low-profile outdoor conduits, painted to match the brick exterior.
Result: 35% annual heating cost reduction, ultra-quiet ventilation in each bedroom, and immediate living room comfort during a major heatwave.
What you need to know before choosing a multizone system
Our practical advice:
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Avoid oversizing: too many BTUs can harm humidity control.
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Choose trusted brands built for Québec winters.
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Check available grants BEFORE buying.
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Always rely on a certified HVAC installation team, like AirGreen.
Why choose AirGreen for your multizone heat pump
We’re not just installers—we’re HVAC expert consultants. Every project begins with a detailed thermal analysis, followed by a customized installation plan. We also handle after-sales support, annual maintenance, and grant processing to maximize your return on investment.
Our clients in Montréal, Laval, Longueuil, the North Shore, and the South Shore choose us for our transparency, attention to detail, and our ability to deliver custom solutions that last.