Understanding the Real Criteria for Choosing a Wall-Mounted Heat Pump: Putting an End to False Beliefs
In the world of residential and commercial HVAC, there are many false beliefs circulating about the wall-mounted heat pump. These misconceptions can lead consumers to make poor choices, delay their decision, or invest in a system that doesn’t suit their home. At AirGreen, we encounter these misconceptions every day on the ground, whether in Montréal, Laval, Longueuil, or on the North Shore and South Shore. Based on our real-life experience as installers, we want to debunk five common myths to help you make an informed, smart, and long-lasting decision.
Misconception #1: “A wall-mounted heat pump doesn’t work well in winter”
This is completely false — at least if you choose the right unit.
Ten years ago, it was true that some wall-mounted heat pumps struggled to produce heat when temperatures dropped below -15 °C. Today, high-performance models like the Gree Extreme, Fujitsu KZAH R-32, or the Sharp ZU1, which we regularly install in Boisbriand, Longueuil, or Anjou, are built to operate efficiently down to -30 °C. These units are equipped with ultramodern inverter compressors that dynamically adjust their output.
We recently installed an 18,000 BTU Gree Extreme wall-mounted heat pump in Sainte-Julie, and even during January’s cold snaps, the client maintained an indoor temperature of 22 °C without ever needing backup heat. This level of performance is now standard for well-selected and properly installed units.
Misconception #2: “All wall-mounted heat pumps are the same”
One of the most common mistakes is thinking that one model is just as good as another, as long as the BTU rating matches. But this ignores the importance of:
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Seasonal energy efficiency ratings (SEER and HSPF)
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Indoor and outdoor noise levels
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Low-temperature performance
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Long-term reliability
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Eligibility for government grants
For example, a Bosch BIVA IDS Premium R-454B model can deliver outstanding performance and long-term durability, but it requires a higher budget. On the other hand, models like the Senville Leto are more affordable but offer a narrower range of performance.
During a project in Laval, we replaced an aging wall-mounted heat pump with a Fujitsu KZAH 12,000 BTU R-32, which is more compact, quieter, and energy-efficient, allowing the client to benefit from a $1,470 LogisVert grant. The result: a 35% reduction in their annual energy bill.
Misconception #3: “Wall-mounted heat pumps are only for small homes”
This myth is based on a poor understanding of how multi-zone systems work.
Today, we can install multiple indoor wall units connected to a single outdoor compressor, which makes wall-mounted heat pumps perfectly suitable for entire single-family homes, duplexes, and even office spaces in Montréal and Boucherville. The advantage? Perfect modularity, no ductwork, and individual temperature control in each room.
In Saint-Lambert, we recently equipped a triplex with three indoor Gree Sapphire units ranging from 9,000 to 18,000 BTU, giving each floor its own climate comfort while reducing the building’s overall energy footprint.
Misconception #4: “Wall-mounted heat pumps are noisy”
Thanks to technological advances in recent years, modern wall-mounted units now operate virtually silently. Models like the Sharp ZU1, with indoor noise levels as low as 19 dB, are barely audible — comparable to the sound of rustling leaves.
In a project carried out in Île-Bizard, we installed a 15,000 BTU Sharp ZU1 unit in a client’s bedroom who suffers from sleep issues. Not only did the temperature remain consistent throughout the night, but the total silence of the unit was a major relief for their sleep quality.
The noise level of a heat pump also depends on the quality of the HVAC installation. Poor wall mounting or improper vibration insulation can cause noise issues. That’s why at AirGreen, we systematically use anti-vibration brackets, reinforced anchors, and professional-levelers to ensure a perfectly silent installation.
Misconception #5: “Maintenance isn’t that important”
False — and potentially expensive.
A poorly maintained wall-mounted heat pump can see its performance drop by up to 30%, consume more electricity, and give off unpleasant odors due to dust, mold, and bacteria buildup inside the evaporator.
We offer complete HVAC maintenance services throughout Laval, Montréal, and the South Shore. During an intervention in Anjou, we cleaned a unit that hadn’t been serviced in over three years and whose performance had plummeted. After a deep cleaning of the coil, fan, and drain pan, the heat pump regained full capacity, and the customer’s electricity bill dropped by 20%.
We recommend annual maintenance, in the spring or fall, to maximize your heat pump’s lifespan and ensure optimal performance year-round.
How to Make the Right Choice: AirGreen’s Advice
Choosing a wall-mounted heat pump isn’t just about brand or price. It’s a technical and strategic decision that depends on:
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The size of the space to be cooled/heated
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The number of floors or zones
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The building’s insulation
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Your lifestyle habits
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Your priorities: efficiency, quietness, energy savings…
At AirGreen, we take the time to analyze each of these parameters before recommending a customized HVAC solution. We don’t just sell you a machine. We ensure a flawless installation, performance optimization, and full support with grant applications (up to $2,172 depending on the model and location).
Common Mistakes to Avoid
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Buying online without professional installation
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Undersizing or oversizing the BTU rating
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Ignoring wall bracket quality or water drainage
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Neglecting maintenance
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Relying solely on price without considering energy quality
Why Trust AirGreen?
With hundreds of wall-mounted heat pump installations across Montréal, Laval, Longueuil, as well as the North Shore and South Shore, our team has seen, corrected, and perfected all kinds of projects.
Our advantages:
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Certified expertise in residential and commercial HVAC
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High-performance, energy-efficient products
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Skilled and experienced installers
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Full assistance for LogisVert and Chauffez Vert grants
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Customized HVAC maintenance services
In Summary: Avoid Pitfalls, Make a Smart Investment
Modern wall-mounted heat pumps are reliable, powerful, quiet, and perfectly suited to Quebec’s climate. But their performance depends entirely on proper sizing, the right model, and professional installation.
At AirGreen, we turn every project into a long-term success by eliminating false beliefs and focusing on technology, transparency, and HVAC expertise.
Contact us for a free, personalized evaluation. Together, we’ll make the right choice.