Providing optimal comfort while eliminating unwanted noise: that’s a challenge we take on every day at AirGreen, as specialists in HVAC installation, maintenance, and repair across Greater Montreal. In this article, we reveal how we solved one of the most common and frustrating issues for homeowners: a noisy wall-mounted air conditioner. Thanks to our expertise, more than 500 homes in Montréal, Laval, Longueuil, the North Shore, and the South Shore have regained the peace and quiet they deserve.
Understanding the causes of a noisy wall-mounted air conditioner
A wall-mounted air conditioner is designed to run quietly. However, several factors can lead to abnormal or excessive noise, such as:
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Poor positioning of the indoor unit on a non-load-bearing or poorly insulated wall
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Vibrations transmitted through inadequate or worn-out mounts
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Premature wear of the fan or compressor
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Buildup of dirt or dust in the heat exchanger or ducts
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Electrical installation issues that can create humming or buzzing sounds
These noises can seriously disturb thermal comfort and negatively impact quality of life—especially at night.
Our AirGreen approach: diagnosis, solutions, satisfaction
When we receive a service call about a noisy air conditioner, we follow a precise and thorough method to quickly identify the source and provide lasting solutions.
Step 1: In-depth on-site analysis
Our technicians visit your home to carry out a complete technical diagnosis of the system. They inspect:
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The structure of the installation wall
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The condition of the brackets and mounting supports
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The internal components of the air conditioner (motor, fan, compressor)
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The actual noise level measured in decibels
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Any buildup of dust or moisture in the ducts
This process allows us to determine whether the noise is due to a faulty installation, dirt accumulation, premature wear, or an ill-suited unit.
Step 2: Customized and long-term solutions
Based on the diagnosis, we suggest one or more of the following solutions:
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Repositioning or complete reinstallation of the wall-mounted air conditioner on a sturdier structure
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Adding professional anti-vibration brackets to isolate the unit from the wall
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Replacing internal mechanical parts such as the motor or fan blades
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Deep cleaning of the entire system, including filters, coils, and blower
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Updating or adjusting the programming to reduce short cycles and noisy startups
Real-life examples: 3 key interventions in Montréal and surrounding areas
Case #1 – Montréal, Rosemont neighborhood: a 12,000 BTU Gree Lomo on a gypsum wall
A couple reached out after suffering from constant vibration noise in their bedroom. Their 12,000 BTU Gree Lomo wall-mounted AC had been installed directly on a lightweight interior wall. We:
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Removed the indoor unit
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Reinstalled the system on a load-bearing brick wall
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Installed a custom anti-vibration mounting kit
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Added soundproof wall insulation
Result: a 12-decibel reduction, with near-silent operation.
Case #2 – Laval, Chomedey neighborhood: a poorly mounted 18,000 BTU Sharp ZU1
The homeowner reported a metallic rattling sound. We discovered that the outdoor unit had been installed on a rusted, unbalanced support bracket. We:
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Replaced the wall mounts with anti-corrosion consoles
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Realigned and leveled the outdoor unit
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Inspected the compressor for proper alignment
After the intervention, the client reported total silence, even during startup.
Case #3 – Longueuil: a dirty 15,000 BTU Fujitsu KZAH
A relatively new air conditioner was making a constant high-pitched whine. We performed a full system cleaning, including:
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Dust removal from the HEPA filters
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Degreasing of the heat exchanger
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Motor lubrication
The system returned to smooth, silent operation, just like when it was first installed.
Why trust AirGreen with your noisy air conditioner?
At AirGreen, our mission is simple: to improve your living comfort in a long-lasting way. Our approach stands out thanks to:
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Local expertise built on hundreds of successful interventions in Montréal, Laval, Longueuil, the North Shore, and the South Shore
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Certified technicians trained on all major brands (Gree, Fujitsu, Sharp, Tosot, etc.)
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Use of professional-grade acoustic measuring tools
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Thorough documentation of every service call
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A responsive after-sales service if noise issues persist
Whether it’s a new or existing unit: our recommendations to avoid noise issues
Whether you already own a wall-mounted AC system or are planning a new HVAC installation, here are some tips to avoid common mistakes:
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Choose quiet models (< 22 dB) like the Fujitsu KZAH or the Gree Sapphire
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Always hire certified professionals for installation
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Avoid lightweight or non-insulated walls for indoor units
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Schedule a full HVAC maintenance every year
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Regularly check the stability of outdoor brackets
Peace and quiet restored, comfort guaranteed
Thanks to our meticulous and personalized approach, we’ve helped over 500 families rediscover the quiet comfort of their homes, without compromising their wall-mounted air conditioner’s performance. If your system is noisy, don’t settle for discomfort. AirGreen is your trusted partner, ready to step in with fast, effective service anywhere in Greater Montréal.