Yes. We use one, also in a reefer, to store cheese from our cheese plant. It's an alternate thermostat, basically. It has a small electric heating element that

Yes. We use one, also in a reefer, to store cheese from our cheese plant. It's an alternate thermostat, basically. It has a small electric heating element that you attach to the AC unit's temperature sensor, and then you stick the coolbot's sensor in the fins of the AC unit. Works great!