Five Reasons Why Your AC Smells Musty

Your air conditioner has one primary function: to make your home cool and comfortable, giving you the chance to relax. If it isn’t operating quite right, though, you may need the help of our team for HVAC services in Elizabethtown, KY. When you’re thinking, “My AC has a musty smell,” learn how our service professionals can restore your peace of mind.

1. Unwanted Moisture in the Ductwork Can Cause a Musty-Smelling AC in Elizabethtown, KY

As they age, the ducts in your home will accumulate dust and other fine particles. Moisture in humid air clings to these particles, creating dampness inside your ductwork.

Eventually, mold spores may thrive and grow, causing an unpleasant odor. Just one spot of mold inside your ductwork could send spores (and the smells that go along with them) into every room of your house.

Scheduling annual cleanings from seasoned technicians keeps those particles at bay, making your indoor air fresher, cleaner, and healthier.

2. Your Condensate Drain Line May Be Clogged

When your air conditioner is running constantly in Elizabethtown, KY, during warm summers, the system will be under extra stress. High daily temperatures here are in the 80s and 90s from June through September.

As your air conditioner runs more often in these warm-weather months, it generates more moisture than usual. This could lead to a clog in the drain line, which causes moisture to back up and collect. This is a common reason why our customers report, “My AC has a musty smell.” 

Any additional dampness in this area can lead to the formation of mold. When wondering how to prevent an AC musty odor, don’t forget to schedule occasional drain line cleaning.

Depending on the design of your cooling system, it might be outfitted with a drain pan. This feature collects moisture to keep it off the floor. 

Normally, the water evaporates out of the drain pan, meaning you don’t have to do anything with it. However, if the pan has a lot of moisture or if it fails to evaporate, mold formation could result, creating unwanted odors.

3. The Air Conditioner’s Evaporator Coil Might Be Frozen

As warm, humid air moves through the air conditioning system, some condensation may accumulate on the evaporator coils. The cold refrigerant inside the coils can temporarily freeze the condensation. When it thaws, the accumulation of moisture might create a musty odor.

A dirty HVAC filter due to a lack of maintenance often causes condensation to freeze on evaporator coils.

4. You May Have Mold on Your HVAC Filter or in the Ductwork

Your AC might also have a musty smell because of mold in the air conditioner ductwork. When the HVAC system’s air movement carries mold spores through the ducts, they eventually hit the furnace filter.

If the filter is dirty and has some moisture on it, the mold could lodge itself there and grow. Irregular dark spots are a tell-tale sign of problems deep within the system. Reach out to an HVAC professional for expert assistance.

5. Your Dehumidifier Is Not Working Properly

Because Elizabethtown, KY, has moderate-to-high humidity conditions throughout the year, you might need to run a dehumidifier. Hot and humid summers are common in central Kentucky. 

If your dehumidifier stops working properly, it may not be long before you start noticing some of the problems discussed above. Don’t wait to resolve them before they get out of hand.