We suggest heat pack use for amphibians, but not typically for snakes and lizards. If it is getting too hot, it would be better to wait for a cooler break in the weather. Cool packs don't work the same as heat packs, in that they do not have an extended release, so their usability window is much more limited.
You can see our specific temp guidelines, including heat and cold pack use, here:
ShipYourReptiles Get Help section- Regulating the temperature of your package
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