The XC was Hunter's entry-level residential controller that was sunset in 2010. The XC was replaced by the X-Core, which was developed as a more efficient and versatile solution for the same applications. The X-Core is recommended as the replacement for current XC owners. All XC's are warrantied for two years from the manufacturing date code. For detailed information on how to find and interpret your manufacturing date code, download and review our Warranty Return Form.