All AllerAir Air Filtration Systems employ high efficiency electric motors specially designed for long continuous operation at high rpm. One motor consumes 95 Watts of power at a maximum speed. This is equivalent to the electricity used by a single 100 watt bulb. Our energy efficient Air purifier costs only pennies to operate 24 hours a day. Most competitive HEPA systems use 300+ Watt motors because of their lower cost but they use three times the electricity of the AllerAir units. Using these inferior motors can cost you hundreds of dollars in additional electricity costs each and every year. With AllerAir YOU SAVE MONEY!