Learned my lesson after a trip last week… I have sensors for nearly everything, but somehow totally forgot about the Fridge / Freezer.
A power outage made my fridge lose it’s mind and turn off cooling, even after it powered back up. Unplug / replug seems to have fixed it, but all the food was spoiled when we got home. Simple $10 temperature sensor could have saved everything!
Water sensor near your washing machine.
And a smart speaker connected to HA in the bedroom to play a alarm once the smoke detector goes off.
I’ve yet to experience a smoke detector quiet enough that I couldn’t hear it throughout my entire house