Check the listing for details. ACI/20K-R SENSOR THERMOSTAT. Condition: Used, Made in United States. Listed at 6.99 USD. The ACI/20K-R Sensor Thermostat is a specialized HVAC sensor designed for use in commercial and industrial heating and cooling systems. Made by the trusted brand ACI, this thermostat is capable of accurately detecting temperature changes to help regulate heating and cooling systems efficiently. It is an essential component for maintaining optimal indoor environments in various business and industrial settings.The ACI/20K-R Sensor Thermostat is a specialized HVAC sensor designed for use in commercial and industrial heating and cooling systems. Made by the trusted brand ACI, this thermostat is capable of accurately detecting temperature changes to help regulate heating and cooling systems efficiently. It is an essential component for maintaining optimal indoor environments in various business and industrial settings.