As long as you're signed into the same Google account on your phone, it's possible to broadcast to the speakers remotely, letting you inform the entire household that you've left the grocery store and are on the way home.
TORONTO-ecobee, Inc. today announced an integration with the Google Assistant, enabling homeowners in Canada and the U.S.to control all ecobee smart thermostats through eligible Android phones, iPhones and voice activated speakers like Google Home. Based on Google's wording, it only says that it'll broadcast to "all Assistant enabled speakers" and "Google Homes". This may prove to be a bit hard if it's a smartphone, but at least with Google Home speakers, you can guarantee that. This is a handy feature and allows you to let other family members know it's time for dinner, notify them that the laundry is done, or whatever message you need to pass along.
If you happen to have an ecobee thermostat for in your home, setting it up to play nice with Google Assistant seems fairly easy.
It is now rolling out as an update to US, Australia, Canada, and the UK. The trigger word or phrase is "Ok Google, broadcast..." and then you can go from there. Say, for example, you're leaving office for home and want to notify your spouse.
Everyday messages can also be broadcast, such as time for breakfast/lunch/dinner, time to leave, and the like, which will be accompanied by a sound. Once that is said, a bell will ring on all connected speakers along with what you're broadcasting.
"Broadcasting starts rolling out today to the Assistant on phones and speakers set to English language in the U.S., Australia, Canada and the United Kingdom, with more languages coming soon", both gents conclude. The support for more languages will be added soon.