Understanding and mastering the subtleties of your multizone heat pump for optimal comfort in every room
At AirGreen, we know how important it is to maintain even indoor comfort across all rooms of a home or commercial space, especially in Montréal, Laval, Longueuil, on the North Shore and the South Shore. Yet, even with a high-performance system like a multizone heat pump, it’s not uncommon for some rooms to feel warmer or colder than others. This can be frustrating, but the good news is that the issue often stems from just a few simple settings. Drawing from our expertise in HVAC installation and maintenance, we’ll walk you through three key adjustments that can help you get the most out of your multizone heat pump and ensure even comfort throughout your entire space.
1. Properly set the temperature on each indoor unit
Why every wall-mounted multizone unit deserves individual attention
A multizone heat pump works with multiple indoor units, each serving a different room or area. One of the major advantages of this setup is the ability to customize the temperature in each space based on the occupants’ preferences. However, this flexibility can lead to uneven heating if settings aren’t balanced correctly.
AirGreen tip:
Make sure the temperature settings don’t vary too much from one unit to another. For instance, if you set one room to 24°C and another to 19°C, the outdoor unit may end up overcompensating, creating unwanted temperature differences. Ideally, keep the difference between units to a maximum of 2–3°C to maintain optimal energy efficiency and better air circulation.
2. Adjust fan speeds and operating modes
Striking the perfect balance between comfort and performance
Each wall unit usually allows you to manually or automatically adjust the fan speed. If it’s not set properly, you could end up with insufficient or excessive airflow, which affects how heat is distributed.
At AirGreen, during our many installations in Montréal, Laval, and on the South Shore, we often encounter setups where a room remains cold simply because the fan is running at the lowest speed, while other units are operating at full capacity.
Practical tips:
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In heating mode, choose a medium or high fan speed for larger rooms.
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When in auto mode, make sure the system is accurately detecting the ambient temperature.
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Avoid using different modes simultaneously (heating in one room, fan-only in another), especially on standard multizone systems, as this can disrupt the overall performance of the heat pump.
3. Check the temperature sensors and the positioning of each unit
How placement affects temperature readings
Each wall unit has a built-in temperature sensor. If the unit is placed near a window, a cooking appliance, or in a poorly ventilated corner, the sensor may give inaccurate readings, leading to over- or under-heating in that room.
Real-world AirGreen solutions:
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During a HVAC installation in Boisbriand, we repositioned a wall unit that had been installed too close to a built-in oven. The result: temperature readings became more accurate, and the client immediately noticed a better heat balance.
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If repositioning isn’t an option, we recommend installing a remote wall thermostat, compatible with certain Fujitsu, Gree, or Bosch models, which allows the unit to read the temperature away from direct airflow.
The importance of seasonal maintenance for your multizone system
Even with optimal settings, a poorly maintained multizone heat pump can still lead to temperature imbalances between zones. At AirGreen, we recommend a full HVAC maintenance before each heating and cooling season. This includes:
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Cleaning the filters of each wall unit
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Checking refrigerant levels
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Inspecting fan motors and electronic boards
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Balancing airflow throughout the entire system
During a service call in Longueuil, we identified a clogged filter in a 12,000 BTU Gree multizone wall unit. This blockage was reducing heat output in the main bedroom, causing a noticeable difference compared to the living room. After cleaning, thermal balance was restored without having to change any settings.
Professional, personalized solutions from AirGreen
Whether you’re a homeowner in Laval or managing a building in Montréal, optimizing a multizone system requires a fine understanding of its settings and how it interacts with the indoor environment. Our experienced technicians are ready to analyze heat imbalances, propose targeted adjustments, and ensure consistent performance year-round.
Our recent interventions:
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In Saint-Eustache, we fine-tuned 9,000 and 18,000 BTU Fujitsu KZAH wall units in a multi-generational home to balance room temperatures.
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In Boucherville, we calibrated fan speeds on a Gree Multi+ Ultra system after the client reported uneven room heating.
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In Rosemère, we added a remote thermostat in a condo to improve heating accuracy in the master bedroom.
Three common mistakes to avoid with a multizone heat pump
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Programming conflicting time schedules between zones.
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Ignoring the orientation of the airflow vanes that direct warm or cool air.
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Neglecting maintenance of indoor units because of their small size.
Conclusion: multizone comfort is all about balance
A multizone heat pump is an excellent choice for homes or buildings with multiple rooms, but its effectiveness depends on optimized use. By adjusting zone temperatures, managing fan controls, and properly positioning units, you turn a capable system into a top-tier comfort solution.
At AirGreen, our mission is to provide you with even, reliable indoor comfort, while maximizing your equipment’s energy efficiency. Contact us for a personalized assessment or professional maintenance of your multizone system—whether you’re located in Montréal, Laval, the North Shore, or the South Shore.