Efficiency in this context refers to whether the compressor is still providing the same Cubic Feet per Minute (CFM) output as it did when you initially bought it. Utilizing an efficient air compressor can result in cost savings. Compressed air is among the costliest energy forms in a manufacturing facility, as it takes eight horsepower of electricity to produce one horsepower of compressed air. In some cases, the annual electricity expenses can even surpass the initial purchase cost of the air compressor.