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Why is my evaporator coil smells bad

HVAC

The answer to 'why is my evaporator coil smells bad' is that a smelly evaporator coil is usually caused by a buildup of mold, mildew, or bacteria. This can happen when the coil gets damp and doesn't dry out completely, providing a perfect environment for these microorganisms to grow.

Some common symptoms of a smelly evaporator coil include a musty or moldy odor coming from your HVAC system, reduced airflow, and poor indoor air quality. If left untreated, the problem can get worse over time and potentially cause health issues for people with allergies or respiratory conditions.

Sources

1.
ACHR News— guide
2.
EPA— authority
3.
ASHRAE— reference

Step-by-Step Guide

  1. 1

    Inspect the Evaporator Coil

    Locate the evaporator coil, which is typically inside the air handler or furnace. Visually inspect it for signs of mold, mildew, or debris buildup.

  2. 2

    Clean the Coil (if possible)

    Use a commercial coil cleaner and a soft brush to gently scrub the coil, being careful not to damage the delicate fins. Rinse the coil thoroughly with water.

  3. 3

    Address the Root Cause

    Determine and fix the underlying issue, such as poor drainage or excessive humidity, to prevent the problem from recurring.

  4. 4

    Call a Professional

    If the coil is difficult to access or the problem persists, it's best to call an HVAC technician to properly diagnose and resolve the issue.

Frequently Asked Questions

How do I clean a smelly evaporator coil?

You can try cleaning the evaporator coil yourself by using a coil cleaner solution and a soft brush. However, if the problem persists or the coil is hard to access, it's best to call in a professional HVAC technician.

Why is it important to address a smelly evaporator coil?

A smelly evaporator coil can indicate a larger issue with your HVAC system, and if left unaddressed, it can lead to reduced efficiency, increased energy costs, and potential damage to other components.

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