Causes of a Musty AC Odor & How to Fix It

Have you noticed a musty scent coming from your air conditioning unit? The odor can be unpleasant and indicate issues that need to be handled. This common problem is often caused by debris and moisture building up in the AC system, which can create mildew, mold, and bacteria.

If nothing is done, the smell can get worse or even impact your home’s air quality. That’s why you should handle this issue as soon as possible. Below are a few causes of this musty odor and how to fix it.

Clogged or Dirty Air Filters

Musty AC scents often come from dirty or clogged air filters. Air filters trap dirt, dust, and other substances before they can reach your home. If the filter gets clogged, it can prevent proper airflow, and moisture may build up. Moisture combined with dirt can lead to mold and mildew growth, which leads to a musty scent.

Cleaning or replacing your air filters regularly can prevent this problem. In most cases, replacement should occur after one to three months, depending on the type of filter and how often it is used. Check your air filters regularly for fewer issues.

Excess Moisture in the AC System

When an air conditioner cools, it creates moisture as part of that process. However, when there is a lot of moisture in place, it can make a musty odor. This might mean the AC isn’t draining as it should due to a malfunctioning or blocked drain line. If water accumulates in the system, it can quickly create mold and mildew.

Make sure your drain line is free of blockages. Clean the pan and drain line if you see standing water in the drip pan or around the unit. For serious issues, consider bringing in a professional to check the system’s functioning correctly.

Mold or Mildew Growth in the Ductwork

Homes with ductwork can also be a source of musty odors. Mildew and mold can grow in the ducts, especially if there is excessive water or poor ventilation. This can lead to bad scents, but it can also reduce air quality and cause symptoms of allergies.

If you believe there might be mold in the ducts, ensure they are inspected and cleaned by a professional. Having the ducts cleaned regularly can avoid the buildup of contaminants and keep your AC running smoothly.

Keep Your AC Smelling Fresh

Everything from clogged air filters to mold in the ductwork can lead to musty odors. Addressing these issues quickly is essential to avoid additional damage and keep your home comfortable and free of scents.

If you have AC issues, like musty odors, contact Elite Heating and AC Repair. Our HVAC experts are ready to clean, inspect, and repair your system. Call us today to schedule our services!