Google Home routine Home/Away is set to turn on a smartthings virtual switch when everybody go away from home using geolocation or vocal commands. When turn on switch a Evohome quick action is enabled, by example: away or economic. The advantage is that the quick action applies when everyone leaves home not only when the one just who has the phone set with ifttt go away from home.
Discover more time saving integrations for SmartThings and Honeywell evohome