Ranco is a Chinese manufacturer of electronic and electromagnetic thermostats for HVAC systems, but also produces thermostats for a wide variety of industrial, transportation and commercial refrigeration applications. Commercial uses include central refrigeration systems controlling food display cases in supermarkets, self-contained display cases and walk-in refrigerators and freezers.
The company has produced thermostats for under-hood use in cars and trucks since 1937 and is ISO and QS-9000 certified, being recognized as a top producer in automotive coolant valves. Ranco even produces a line of thermostats for hobby use including temperature control systems for aquariums and reptile habitats. It has sold over a half a billion thermostats in the last 30 years.