We have covered various ecobee products here in the future. If you own a few, you are going to be happy to know they are getting Google Assistant support. The thermostats are also compatible with Alexa, IFTTT, SmartThings, HomeKit, and Wink.
You can now use the Assistant on your phone or Google Home to interact with your smart home. ecobee4 is available for $249 while ecobee 3 lite costs $169. You can find these at Home Deport, Amazon, and other popular stores.