Air conditioning (refrigeration) removes humidity from air by cooling the air. Cool air can't hold as much moisture. The water vapor condenses out as liquid water and goes out through a drain. It is possible that your drain is plugged up. preventing the water from exiting. That would allow at least some of it to re-evaporate and "contaminate" your nice cool dry air.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970