Heat yes, cold no. Fortunately, Peridot's a fair bit more heat resistant than some people, thanks to all her faerie mutations. It's sort of like trying to burn a dragon? You can do it, but it takes some extra effort.

It's still enough to annoy her and cause some discomfort though, like a particularly itchy bug bite. She growls and pulls her feet up off the ground, shifting onto all fours and backing up along the fountain's edge like an ornery cat.