Depending on the brand of the cooling equipment you should be able to purchase or reprogram the thermostat to a lower setting. You could also looking into something along the lines of a "CoolBot" that is designed to attach to the controls on a conventional cooler and trick it into running at a much lower temp.
Check the mfg you will more than likely be able to get a new thermostat or if you are lucky you will already have a programmable one. It depends on what you have already. I know many comercial units come from the factory already set up to be either or. Check your specs and get back to us.