An ENERGY STAR certified dehumidifier removes the same amount of moisture as a similarly-sized conventional unit, but uses 15% less energy. In fact, the annual energy saved by an ENERGY STAR qualified dehumidifier could power your ENERGY STAR qualified refrigerator for 4 months! (Source: http://www.energystar.gov/products/certified-products/detail/dehumidifiers)

(Source: http://www.homedepot.com/b/Heating-Venting-Cooling-Air-Quality-Dehumidifiers/N-5yc1vZc4l8Z2bcq1e)