Unusual noise or vibrations should never be ignored: discover the possible causes and concrete solutions we apply at AirGreen.
A wall-mounted heat pump is designed to operate quietly, smoothly, and efficiently. When vibrations or strange noises occur, they can not only affect your comfort but also signal a mechanical or installation issue that may become more serious. At AirGreen, we regularly receive service calls from clients in Montréal, Laval, Longueuil, on the North Shore and the South Shore, concerned about the noise coming from their wall unit. Here are our expert recommendations to help you detect the source of these vibrations and act quickly.
Understanding the noises and vibrations coming from a wall-mounted heat pump
A properly done HVAC installation should not produce disruptive mechanical sounds. However, several issues may explain the appearance of persistent vibrations, clicking, or even metallic buzzing:
-
Insufficient mounting: A wall bracket that’s loosely secured or misaligned can create amplified vibrations.
-
Uncalibrated compressor: If the indoor or outdoor unit vibrates, the compressor may be operating at an abnormal frequency.
-
Overly rigid or tight piping: Refrigerant lines that are too straight or tight can transmit vibrations through the walls.
-
Unbalanced fan: A slightly bent or loose blade can create recurring shaking when the unit starts up.
-
Poor acoustic insulation: Some lower-end models don’t use the proper materials to absorb and limit vibration transfer.
AirGreen case study: emergency call in Ahuntsic for a Fujitsu heat pump
In February 2025, we received a call from a client located in Ahuntsic-Cartierville, Montréal. Their Fujitsu KZAH 12,000 BTU wall unit, installed by another company, was shaking heavily each time it started. After a full inspection, our technicians discovered that the metal wall bracket had only been mounted with two screws in drywall, with no anchoring into a stud.
Our intervention involved:
-
Repositioning the unit on a certified anti-vibration wall mount
-
Installing rubber dampening pads
-
Re-adjusting the pipes to include a flexible expansion loop
The result: no more vibrations, quiet operation, and a very relieved client. The installation is now fully HVAC compliant, and the client was able to keep their heat pump while benefiting from an extended warranty thanks to our repair.
How to identify the source of the vibrations yourself
Even before calling a professional, there are a few simple tests you can do to try to pinpoint the source of the vibration:
-
Gently touch the wall unit: If the noise gets louder when you touch it, the issue is likely with the bracket or inside the unit itself.
-
Listen to the frequency: A steady hum often means it’s the compressor, while a pulsing noise could indicate the fan.
-
Check the wall: If you feel the vibration traveling through the wall, the wall mount is likely to blame.
However, only a professional inspection can confirm the diagnosis and provide a long-term HVAC solution.
What you should never do when you notice noise or vibration
-
Ignore the issue: The longer you wait, the more likely it is that the imbalance will damage internal components.
-
Try to prop up the unit with objects: This can interfere with airflow or block the condensate drain.
-
Take it apart without the proper expertise: HVAC systems contain delicate electrical and refrigerant components.
Professional solutions offered by AirGreen
At AirGreen, our expertise is built on hundreds of successful HVAC installations and repairs across the Greater Montréal area. Depending on the diagnosis, we offer:
-
Replacement of the wall bracket with a reinforced, insulated version
-
Precise compressor tuning or control board reprogramming
-
Fan rebalancing and bearing lubrication
-
Installation of anti-vibration pads at wall connection points
-
Re-routing of refrigerant lines for better flexibility and absorption
Every intervention is performed according to strict HVAC safety standards, with special attention to aesthetics and discretion in your living space.
Why choose AirGreen for your inspection or repair?
-
Rapid service across Montréal, Laval, Longueuil, North Shore and South Shore
-
HVAC-certified, professionally trained technicians
-
Clear diagnosis and transparent explanation of the issue
-
Repairs guaranteed with original parts
-
Personalized advice to help you prevent future issues
Our clients choose us not only for our technical know-how but also for our human approach, precision, and commitment to extending the lifespan of every wall-mounted heat pump we install or repair.