Yup - even if I still only had a simple mechanical thermostat I'd still have a second as a backup. The backup thermostat was easy to add - just wired it in pa

Yup - even if I still only had a simple mechanical thermostat I'd still have a second as a backup. The backup thermostat was easy to add - just wired it in parallel directly next to my furnace in the basement; all I had to do was run the second cable from the second thermostat into the furnace control board and double up the connections on the terminals that call for heat. Cheap insurance that took all of 10 minutes to install.