If you have the "Smart Away Temperature Exceeded" notification enabled, Flair will send a notification if your home goes outside the defined Smart Away bounds.
If Smart Away is enabled, and your home is Away, Flair will periodically check to see if the system temperatures are within the Smart Away bounds.
If temperature in your home is outside the Smart Away bounds by 5 degrees Fahrenheit for at least 30 minutes, and you have notifications enabled, Flair will send a notification.
See also Notifications.