Musty closets, damp-smelling rooms, and condensation can make apartment living frustrating. This guide covers practical ways to check indoor humidity, reduce excess moisture, and keep small spaces fresher — without expensive renovations or permanent changes. From simple humidity monitors to compact dehumidifiers and closet moisture solutions, these are renter-friendly ideas worth considering before you buy. (Affiliate disclosure: I may earn a commission from purchases made through links on this page, at no extra cost to you.)