In testing funded by the DoE and completed by Pecan Street Inc., installing a Compressor Controller for a single pump reciprocating air compressor was found to reduce energy usage by 23% while also 1) reducing moisture condensate collection in the air compressor tank by nearly 100%, 2) reducing start-up current demand, 3) eliminating the drifting pressure bandgap, and 4) protecting from thermal overload at a prescribed temperature.