In our continual effort to be energy efficient, we have installed a new 75 horsepower variable frequency drive air compressor with programmable logic control technology, retiring a vintage fixed speed unit. This technology will allow the compressor to match our air needs without running at 100% as with the old fixed speed system. With the programmable logic control during down times (weekends and/or holidays), the air compressor will now shut off, saving ~25-41 hours of use per week when compared to the old fixed unit system.