Why does the office air conditioning smell damp? Causes and what to check
In short: An office air conditioner smells damp almost always because of standing water or damp dirt in the condensate pan, the coil, the filters or the ducts. The EPA recommends keeping relative humidity below 60%, ideally between 30% and 50%, and HVAC drip pans clean and unobstructed. The office can check accessible filters, leaks and humidity with a hygrometer without opening the unit. If the smell persists, a technician is the next step. Last verified: 20 October 2026. Every fact links to its official source. Contents of this guide Common causes Symptom, cause and next step Recommended humidity What…












