Why Is My Ductless Mini-Split Hissing?

Ductless mini-split systems are a popular HVAC option thanks to their energy efficiency and flexibility in cooling or heating individual rooms. However, while they typically offer a quiet and comfortable indoor environment, this can change quickly if your mini-splits start to make unusual hissing noises. If you’re experiencing this, don’t panic just yet! In this blog post, our HVAC experts at Parker’s Heating & Cooling will go over some of the main reasons that your ductless mini-split could be hissing.

How Ductless HVAC Systems Work

It’s important to understand how ductless mini-split systems work in order to know what could be causing the hissing noises. These systems consist of an outdoor unit and one or more indoor units, connected by refrigerant lines. The indoor unit houses the evaporator coil, fan, and other essential components responsible for cooling or heating the room. The refrigerant circulates through the system, absorbing heat from indoor air and releasing it outside.

Common Causes of Hissing Noises

Refrigerant Leaks

One of the most common reasons for a hissing noise from a mini-split is a refrigerant leak. In this case, the hissing noise is actually the refrigerant leaking out. Because the refrigerant is responsible for heat exchange, a leak will cause your system to work harder to keep the air cool. If you suspect a refrigerant leak, you should call a professional for mini-split repairs, as refrigerants can be harmful to the environment and your health.

Expansion Valve Issues

The expansion valve regulates the flow of refrigerant in the system. If it becomes faulty or clogged, it can create a hissing sound. If this seems to be the issue, do not attempt to clean the expansion valve yourself. A professional HVAC technician can fix this issue for you.

Loose or Damaged Components

Hissing noises can also be caused by loose or damaged components in the indoor unit. Loose screws, fan blades, or refrigerant lines can vibrate and produce a hissing sound. It’s essential to have a professional inspect and tighten any loose components or replace damaged parts quickly to prevent further damage to the system.

Dirty Filters or Coils

Accumulated dirt, dust, and debris on the filters or coils can obstruct airflow, causing the system to work harder. This strain can result in a hissing noise. Regular maintenance, including filter cleaning or replacement, is essential to prevent such issues.

Call Parker’s for Ductless HVAC Repairs

While ductless mini-split systems are generally reliable, a hissing noise points to issues with your units. Fortunately, for residents in Murfreesboro and the surrounding areas, Parker’s Heating & Cooling is here to help. Our experts have the knowledge, experience, and tools to get to the root of your ductless mini-split problems and fix it promptly.

Don’t let a hissing noise disrupt your home! Call Parker’s today at 615-355-9137 to schedule ductless mini-split repairs in the Murfreesboro area.