Dangerously low temps/Florida warnings for pets??

I used to have a cat who would loll on his back on the patio in freezing weather like it was summer. He had 4" long and THICK fur. In the actual summer, he hid in the deep shade of the trees all day and only came out at dusk.

When I was in LA I saw humans turn on the heat when it was 65 and the AC at 80. Whilst wearing long pants and long sleeves.