We travel with pets and this is also an issue we worry about. I considered something that would text me and would still like to install one but many times the places we stay have little or no cell service.
We did lose power once and almost lost our three Boston Terriers when the heat inside reached 95 degrees
After that I installed a generator auto start system that senses temperature and will start if it detects a high temperature due to loss of power to the AC's.
Nothing man made is still 100% reliable so we still try to leave the pets inside by themselves no longer than absolutely necessary and most times have someone nearby keep a check on our AC's if possible.
2014 Georgetown 351DS
3 Boston Terriers, 1 Frenchie
Gonna miss you Toby. RIP