Open the Google Home app and tap + in the top left corner of the homepage.

Select Set up device > Works with Google.

Tap the Search icon in the top right corner of the page, and search by Eccotemp app name.

Tap the searched result and then Continue. Log in with your Eccotemp account and hit "link now". Hit the authorization button to complete linking your account.

The ESH will now be ready to use voice commands and be added to the "devices" section of the Google Home app.