Musty Smell From Vents

medium priority

Moldy or musty odor when HVAC runs

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Understanding This Problem

Musty smells indicate moisture and potential mold growth in your HVAC system or ductwork. This affects both air quality and health.

Common Causes

Mold in ductwork
Dirty evaporator coil
Clogged drain line
Standing water in drain pan
Moisture problems in home
Dirty air filter

What You Can Do

Replace air filter
Have evaporator coil inspected and cleaned
Clear condensate drain line
Consider duct cleaning
Inspect for mold growth

Prevention Tips

  • Use UV air purifier in air handler
  • Keep drain lines clear
  • Address home humidity issues
  • Annual coil cleaning
Medium Priority

Schedule service soon to prevent the problem from worsening.

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Services That Can Help

Indoor Air Quality

Air purification and quality solutions.

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Duct Cleaning

Complete air duct cleaning service.

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Coil Cleaning

Evaporator and condenser coil cleaning.

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Related Air Quality

Excessive Dust In Home

low

More dust than normal despite regular cleaning

Poor Indoor Air Quality

medium

Allergies, stuffiness, or respiratory issues at home

Humidity Too High or Low

low

Home feels too humid in summer or too dry in winter

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Get Help in Your Area

We serve homeowners throughout the Bay Area experiencing this issue:

Menlo ParkPalo AltoAthertonRedwood CitySan CarlosBelmontSan MateoFoster CityBurlingameHillsboroughWoodsidePortola Valley
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More Helpful Resources

FAQs

Common HVAC questions answered

HVAC Blog

Tips, guides, and maintenance advice

Maintenance Plans

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