Ductless mini-splits have a reputation for running quietly and efficiently throughout the year. Sudden strange noises often indicate something is going wrong inside the system. Here are four ductless mini-split sounds that mean trouble in Staunton, VA.


Your ductless system may be hissing if there are air bubbles in the refrigerant line. It often occurs when the refrigerant leaks out of the mini-split due to a tear or hole.

Always trust an experienced professional to complete your HVAC repairs. Depending on the issue, a technician may take your system apart to find and correct the problem. Without training, you could injure yourself or further damage the unit.


Loose components or debris can produce a loud rattling sound inside your system. They may bang up against the fan blades or hit the underside of the exterior frame. Parts become loose due to regular use, normal wear and tear, and aging.


Vibrating or buzzing noises point to problems with the outdoor compressor. A damaged electrical system will impact the system’s efficiency and increase monthly bills. Other potential issues that produce a noticeable buzzing sound include dirty condenser coils, broken fan blades, and a compromised fan motor.


The air handlers for your mini-split come with well-oiled bearings that constantly move and rotate. The lubrication helps to minimize unnecessary friction and heat within the system. Unfortunately, with time, these bearings will dry out and wear down.

As the friction increases, the components emit an unpleasant grinding noise. It’s vital to call for service as soon as possible before the air handler malfunctions. Catching the problem early will save you from expensive part replacement costs.

Your ductless mini-split likely needs HVAC service if it’s making a grinding, buzzing, rattling, or hissing sound. Contact Valley Air Heating, Cooling & Plumbing for superior ductless mini-split care you can trust in Staunton, VA.

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