Grab a cheap hygrometer from Amazon—they cost like ten bucks. (I bought one after Mark’s book fiasco, and it saved my own paperbacks.) Watch the numbers: If your cooler pushes humidity above 70 percent, it’s time to stop or vent.
Do Evaporative Coolers Make Things Wet at James Glassop blog
Also, listen to your body. Do you feel damp and icky? That’s the swamp effect. Do you feel a cool, gentle breeze with moist skin that doesn’t feel sticky? That’s the sweet spot. Your comfort is the best gauge—ignore the gadget if you feel good.
One more thing: Don’t run it 24/7. Evaporative coolers work best during the hottest part of the day. At night, when humidity naturally rises, shut it off and open windows. (Your walls will thank you—and so will your books.)
The Final Verdict (No Headline Needed)
Yes, an evaporative cooler increases humidity—dramatically. That’s its superpower and its kryptonite. In dry air, you win: cooler temps plus hydrated skin. In damp air, you lose: a sticky swamp with wavy books and potential mold.
So, before you buy one, check your local climate. If you live in Phoenix, go for it—just keep windows cracked. If you live in Houston, run in the opposite direction. (And maybe buy Mark a dehumidifier. He’s still drying out his library.)
Remember: Water works magic, but it also makes things wet. Use your cooler wisely, and you’ll stay cool without feeling like you’re living inside a cloud. Now go check that hygrometer—I’ll wait.
