I have a control board for AC and gas heating system. It was installed last year at cost of about $500 on a 5 ton system and used only one season. We replaced our AC/Heating system this week. Installer said it is worth to sell the board on Craigslist. The board comes with its housing and transformer and installation instruction. If anyone could use it, please see my post at: http://dallas.craigslist.org/mdf/ele/2047727037.html