Crawl spaces break the rules that apply everywhere else in a house. Opening the vents in summer makes them wetter, not drier, because outdoor air at its dew point condenses on surfaces the ground holds at 68°F. A household dehumidifier will ice up or die in one. These guides cover why sealing the ground and the vents comes before the machine, what a purpose-built crawl space unit has that portables do not, and how to size for a sealed versus vented space.
August 28, 2026
August 28, 2026
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