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5 Reasons Why Your AC Smells Musty

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Normally, your air conditioner is not supposed to smell. If you notice any awry or musty odor filling up your room after adjusting the thermostat, then something must be wrong with your indoor unit and you need to call a professional HVAC contractor right away. Failure to take urgent steps could lead to costly repairs or even serious health problems.

In today’s post, we discuss possible reasons why your air conditioning unit could be emitting a musty smell, and ways to resolve this problem.


Frozen AC Evaporator Coil

Your air conditioner works by absorbing warm air and passing it through the evaporator coils before releasing cool air back into the room via the return vents. If the recycled air is warm and musty, then it means it’s not passing through the coils. 

Dirt and debris can block the filters, consequently obstructing airflow. When this occurs, water from the indoor humid air will collect on the coils and cause them to freeze. To solve this problem, you need to clean or change your filters once every two months.


Leakage in the Air Ducts or Vents

If you reside in an area that experiences high humidity levels, chances are that your unit will accumulate excess moisture in the vents or ductwork. This will cause mold and mildew to spread within the ducts, and your air conditioner will inevitably emit a musty smell.

Exposure to mold can cause serious upper respiratory problems. Considering this, you should call a professional HVAC contractor right away, so you can have the ductwork cleaned and repaired.


Wrong Air Conditioner Size

You might not know this, but installing the wrong AC unit size could cause problems such as excess moisture and frequent malfunctions. If the AC is too big for your home, the air won’t dehumidify completely as it cycles through the unit too quickly. If the air con is too small, it would have to work extra hard and this might lead to premature failure and outrageous energy bills.

Consult an HVAC contractor to help you choose the right AC unit size based on the square footage of your space.


Inefficient Drip Pan

The function of the drip pan is to collect water droplets from the evaporator coils and prevent moisture from accumulating in the system. 

Unfortunately, drip pans are among the most delicate parts of an HVAC system and they tend to wear out quickly. Over time, the pan may stop functioning leading to the formation of molds and the release of a musty smell.

An experienced HVAC technician can quickly inspect your unit and replace the damaged drip pan.


Blocked Condensate Line

The condensate line is a small pipe that works by draining away excess moisture from the drip pan to the storm drain. However, because of its small size, it’s very easy for the pipe to clog from mold, sludge or mildew. Considering this, you should clean the condensate line at least once every month to keep clogs and musty smells at bay.


Enlist a Professional HVAC Contractor

Repairing a malfunctioning air conditioning unit is not a do-it-yourself task. In any case, the air con consists of delicate and potentially hazardous parts that require expert servicing. 

Call us today for professional AC installation, repair and maintenance. We will be glad to attend to all your AC needs.

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