It isn't in the sun, it's in my car, in a bag, in the trunk. I never notice any difference in how it feels.
When I damaged my racket by hitting it on the floor, it externally did not look broken at all, no chip or dent or mark even. But the very next ball I hit, I was like "nope, this racket is done"
I've never had an issue like that from the heat or the cold