This isn't a new tool tool to me, but it was a few years ago, and in all fairness I just posted about it in the weather section but thought ya'll might be interested in this since it crosses over.
So I'm pretty sensitive to noise at night when I'm trying to sleep. I'm from the country and I am use to quiet. If I can't have quiet it's hard for me to fall asleep and stay asleep. I also hate trying to sleep in a room that is too hot. So we have an A/C unit in the bedroom and I'll run that for a bit in the evening to pull the heat out of the room and most of the time it cools off enough at night that the A/C unit isn't needed for sleeping and fan is good enough, which is great BC I hate trying to sleep with the A/C unit banging away. The only problem is every fan we have had in the bedroom either moves a pathetically small amount of air, or is to noisy.
I bought this fan a few years ago to use in my shop.
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When I realized how much air it moves on low and how quiet it is, it quickly became the fan in the bedroom window. On high it is loud then but does a great job of moving the a lot of air. Flip it on low and it still moves enough air to create a good amount of air movement and it's whisper quiet.
Takes the bauer battery or plug in with a cord. Three years and still going strong so far. For $29.99 I feel like it's a good deal. And thought I'd pass on this info as a tip.