Musty Smell in Home or from HVAC
Common Symptoms
Musty or moldy odor
Smell when HVAC starts
Damp or earthy smell
Odor worse in certain rooms
Smell coming from vents
Possible Causes
Several factors can contribute to this problem. Understanding the cause helps determine the right solution.
1Mold growth on evaporator coil
2Standing water in drain pan
3Dirty air filter
4Moisture in ductwork
5Basement or crawlspace moisture
6Clogged condensate drain
7Mold in ductwork
What You Can Check First
Before calling a technician, try these simple checks that may resolve the issue.
1
Check and replace air filter
2
Look for visible mold near vents
3
Check condensate drain line
4
Inspect drain pan for standing water
5
Check basement/crawlspace for moisture
When to Call a Professional
Visible mold present
Smell persists after filter change
Coil inspection and cleaning needed
Ductwork mold assessment
Source of smell cannot be identified
Experiencing any of these situations?
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