If a musty odor develops and becomes very pronounced when the HVAC system is first turned on,the case should be washed out with a garden hose.

Question

Quizplus · Accepted Answer

A musty odor when the HVAC system is first turned on usually indicates the presence of mold or mildew. Washing out the case with a garden hose will not effectively address this issue as it only cleans the exterior. A professional HVAC technician should be called to properly diagnose and address any mold or mildew growth in the system.

If a Musty Odor Develops and Becomes Very Pronounced When