This is interesting, so I am going to ask the question about the Wi-Fi security and specifically the thermostat security. I have avoided wireless cameras and similar devices due to security concerns, and I would place a thermostat in the same class if it could be hacked and allow the hacker to control my HVAC system.
My solution would be to have an automatic thermostat and then have a wireless monitor for temperature and humidity for alerts if the automatic unit or HVAC fail.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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