Yes, you can leave an air mover on all night, and for water damage restoration you should leave it on all night continuously to ensure proper drying. Air movers are designed with heavy-duty continuous duty motors that can run 24 hours a day for many days without overheating or failing, and professionals routinely run them overnight for 3 to 5 days straight during flood restoration. For general use like cooling or ventilation, leaving it on all night is also safe as long as you follow basic electrical safety, place it on a dry flat surface, keep the intake and exhaust clear, use a grounded outlet, and avoid using a damaged extension cord. The main consideration is noise, as air movers are loud, typically 70 to 80 decibels, which may disturb sleep unless you are used to white noise or use earplugs. They also use more electricity than a regular fan, about 200 to 800 watts, so running all night will cost a few cents to a couple dollars depending on rates. If you are drying water damage, do not turn the air mover off at night, because moisture will resettle, drying time will double, and mold can begin growing within 24 to 48 hours. For safety, make sure the unit has thermal overload protection, which most professional models do, and check that it is not covered or blocked during the night.
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