As temperatures rise, many will reactivate their air conditioners, which may emit a musty odor if not properly maintained. Common causes include clogged drain lines or mold growth on filters and coils. To eliminate the smell, essential first steps include washing the filter, clearing the condensate drain, and cleaning the drain pan. If these methods fail, professional assistance is advised. Understanding the source of the odor helps in determining the appropriate fix to restore clean air flow.
A clogged condensate drain line is the number-one cause of a musty AC smell, probably around 40% of cases. Water sits in the drain pan, mold starts growing.
Start with these three easy fixes to fix the musty smell: Replace or wash the filter, flush the condensate drain line, and empty and clean the drain pan.
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