Do these coolers create moisture?
Yes, these coolers moisturize with air-cooling, which is very good for people's health and breathing.
Can this moisture be annoying?
No, because the air inside is constantly changing, and fresh air is constantly entering space, and the stale air goes out of the window. Therefore, the moisture inside will not increase. However, in high humidity air conditions, during days or hours with air humidity above 80%, you can shut off the water pump and prevent moisture build-up.