Build Your Own Wi-Fi Connected Thermostat

Open-source Compliance

Nest Open Source packages

https://nest.com/uk/legal/compliance/

Open source smart thermostats rise to compete with Nest after Google acquisition

http://arstechnica.com/gadgets/2014/01/as-nest-sells-out-open-source-smart-thermostats-begin-to-crop-up/

Build Your Own Wi-Fi Connected Thermostat

http://lifehacker.com/build-your-own-wi-fi-connected-thermostat-1503539871

Open source Android thermostat

http://hackaday.com/2012/10/13/open-source-android-thermostat/