Coleman-Mach - ZC Heat/Cool Digital Zoned Thermostat by Coleman-Mach. The Coleman-Mach 8330D3351 RV Comfort ZC Wall Thermostat is used with zone control boxes and will control up to 4 single stage air conditioners or heat pumps and (2) two stage gas furnaces.This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an affordable cost.