Hello John64,
Thanks for reaching out to the Google Nest Community Forum.
The Nest Thermostats don't have an option to send alerts or notifications when the backup heat is on; instead, you'll notice it on the thermostat screen or in the Nest app. Please let our product team know about it by sending feedback. Also, let me know if you have any other questions or concerns. Otherwise, this thread will be locked for 24 hours.
Regards,
Mark
