[Carl n Susan]

The now infamous remote control thermostat installed in 2005 model Montanas was problem for many members. Here is a link to 34 pages of discussion related to this POS. Included in the text is the part numbers you will need to upgrade to the Comfort Control Center (CCC) replacement unit and instructions for installation. Back in the day, Dometic was replacing them for no charge. Today it will cost you. But the CCC is a way better thermostat. The inexpensive Hunter thermostat you desire will not work with the heater and A/C components installed.

http://www.montanaowners.com/forums/showthread.php?t=8145