As soon as I got my package I opened it, set it up, which was super easy by the way, and plugged it in. Thank goodness for the super easy to understand directions because I would have never known this thing could be turned up for more air flow, I love this so much. Let it run all afternoon yesterday and all night last night. I am usually one who gets super stuffy and snores at night. Not last night, wipe up so refreshed and I can not express how much I love this thing. My brother stayed the night last night too and he has terrible asthma that keeps him up at night, not last night, he slept like a baby for a straight 15 hours. Thank you Bissell for making such an outstanding product!!!