I was reading How can I humidify a room without a humidifier?, and it got me curious.
I live in Florida where the humidity is insane. Dehumidifiers cost hundreds of dollars. What is a cheaper alternative to dehumidify a small room (about 10x10)?
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An ordinary air conditioner dehumidifies the air as it cools. If you don't need cooling, you can let the machine's hot air exhaust mix with the cold, and you'll get a slight heating effect, but the water will still be pulled out of the air by condensation on the cold evaporator coils.
You can get small air conditioners for under $100, though you might have to improvise a bit in terms of mounting to use it this way.
You can get a portable dehumidifier. It doesn't cost that much. I have one and it works well for a single room. The one I got is this Ivation dehumidifier from Amazon
Turning on AC in the summer and turning on furnace(electric heater) in the winter also helps reduce humidity in the room.