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why is my central air smells bad

HVAC

The answer to 'why is my central air smells bad' is that there are several common causes, including mold or mildew buildup, a dead animal in the ductwork, or a problem with the drain line. Symptoms can include a musty, moldy, or rotten odor coming from the vents.

If the smell is coming from the vents, it's likely due to mold or mildew growth in the ductwork or coils. This can happen if there's excess moisture in the system. You may be able to clean the coils or ductwork yourself, but it's best to have a professional HVAC technician inspect and clean the system to properly address the issue.

Sources

1
ENERGY STAR• authority
2
3
HVAC.com• guide

Step-by-Step Guide

  1. 1

    Inspect the air vents and ductwork

    Check for any visible mold, mildew or debris buildup that could be causing the odor.

  2. 2

    Clean the air vents and ductwork

    Use a vacuum with a hose attachment to clean out the vents and visible ductwork. You can also use a duct cleaning solution and wipe down the surfaces.

  3. 3

    Replace the air filter

    A dirty air filter can restrict airflow and contribute to musty odors. Replace the filter according to the manufacturer's recommendations.

Frequently Asked Questions

How do I clean my central air system to remove the smell?

For a musty smell, you can try cleaning the air vents and ductwork yourself. However, for a more serious issue like mold or a dead animal, it's best to call a professional HVAC technician to properly inspect and clean the system.

How often should I have my central air system serviced?

It's recommended to have your central air system serviced by a professional HVAC technician at least once a year, usually before the start of the cooling season, to ensure it's running efficiently and to catch any potential issues early.

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