Use Smart Home Away as Home Security
I needed a way to instantly put our system into Away mode and keep the Smart Home/Away system active since that transition is the IFTTT trigger. We are not a schedule household as my wife is a stay at home mom and likes to micromanage the temp at night. So I set my schedule to always Away and with a good baseline temp. Then I created a IFTTT DO button that tells the system to return to the schedule, which kicks my system immediately into Away. After that if someone passes the thermostat this recipe is triggered and Smart Home/Away pushes the system into Home and IFTTT sends me a notification.