What this usually means
Replace a dirty filter and note whether odor appears only at startup or throughout operation. Do not assume duct cleaning alone will solve a moisture source.
An evaluation should trace where moisture and odor enter the air path and correct the source when possible.
What you can safely check
- Filter condition
- Visible water near equipment
- Startup-only or continuous odor
- Rooms where odor is strongest
When to call a professional
Call when odor persists, water is present, occupants experience irritation or visible growth is suspected.
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