Your Air Conditioner Smells Musty? Here’s Why

admin  -   11:00 am  -   March 22nd, 2024

A musty odor coming from your air conditioner is unpleasant and can be a sign of a potential problem. It can also affect your home’s air quality by exacerbating asthma and allergy symptoms, which is not ideal during the allergy season. Here at MacFarlane Energy, we want you to breathe fresh air this cooling season, so let’s explore some common reasons why musty air is coming from your air conditioner.


Common culprits behind a musty smelling air conditioner:


  • Dirty filters: Dirty air filters trap dust, allergens, and other debris, which is a great environment for mold and mildew to thrive. Check your air filter regularly and replace it as needed to keep the musty smell away.
  • Full drain pan: Your drain pan collects moisture from your air conditioner, which can be a breeding ground for mold and mildew. Replace your drip pan regularly to prevent moisture buildup.
  • Mold buildup: Not only can mold build up in your air filter, but it can also collect on your evaporator coil, condensate drain lines, and ducts, again causing musty odors.


If you’ve got a musty smell coming from your air conditioner, give MacFarlane Energy a call. We’ve been providing stellar air conditioning services to homeowners in the Boston area for more than 75 years, and we’re here to help you get your home smelling fresh again.


Visit our air conditioning services page and contact us for more information.