This forum post that details making a WiFi thermostat really brings the point ... a re-build of this demo code from the ESP8266 BASIC docs, is nothing more than a few off-the-shelf parts soldered ...

Ecobee Smart Thermostat Essential offers basic smart features at a reasonable price of $129.99. It's compatible with major smart home platforms like Google, Apple, and Amazon and advertises that ...

The basic LCD screen gives you a ton of information ... that integrates with today's smart home systems. The Smart Color Thermostat has a large, sharp screen that delivers a ton of information ...