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I had been eyeing this item for a while now, and post-delivery, while I've very much enjoyed the cooling, I genuinely wonder if it would of been cheaper and better for me to just get a USB powered fan. I can't necessarily say its worth it at above $150 for a tiny swamp cooler that's only really good at cooling one person at time.
I won't say it doesn't have any effect, but come into it with low expectations, maybe you'll get just about everything you wanted if you just bought a usb powered fan.