Dehumidifiers (apart from the desiccant units) consume electricity in order to extract moisture from the air. The amount of energy consumed by a unit can be very high and may eventually lead to enormous electricity bills. However, some dehumidifiers work perfectly and only consume a considerable amount of power. These units that use a fair amount of power are known as energy efficient dehumidifiers. The best energy efficient dehumidifier is the Frigidaire FAD704DWD Energy Star 70-pint Dehumidifier. This unit is the best seller and has many positive customer reviews. It consumes just 745 watts per cycle and costs just a little over $200.