I had another idea I wanted to float by folks. Currently in my house in upstate New York I have two zones of heat each with an old style mechanical thermostat (not line voltage). One of the potential issues I'm facing is we occasionally intend to let friends stay with us and I'm worried that if they turn the heat down in one of the zones and forget about it it may result in pipe freezing issues. I recently picked up two new standard 7 day thermostats and a similar wifi enabled version and I was wondering if I could do the following. 1. Replace the two existing thermostats with the 7 day programmable one. 2. Wire the wifi enabled thermostat to both zones and place it in the basement so that I could set it to turn on both zones if the basement went below 35 or so and if needed remotely raise the temperature of the hole house. My though is that this would enable guests to play with the thermostats upstairs to their hearts content, but give me the piece of mind of having a backup.