Heat like we are experiencing across the country can kill pets (and kids) inside cars - and can kill heat-sensitive animals (including green, desert, and cyclura iguanas) left at home during the day. Enclosures, like cars, get hotter inside as the outside air (including room air) temperature rises.

If you haven’t already read it, please read my article:

Microclimates For Your Reptiles
Dealing with summer heat and low ambient humidity
http://www.anapsid.org/microclimates.html
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Melissa Kaplan
Anapsid.org
Lizards-in-Scarves Blog