Dehumidifiers run quietly and efficiently while taking moisture (a.k.a humidity) out of the air, making the air more comfortable to be in.
A dehumidifier lowers energy costs and helps your traditional air conditioner to run more smoothly. When the air is humid, your air conditioner has to work twice as hard to remove the moisture from the air and cool the air.
Using a dehumidifier lowers energy costs because you don't have to use the A/C as much as you typically would.