Yes, heat and cold are a challenge for most PWP sooner or later. It disrupts our ability to keep things under control. (It is strange that so many of us struggle for control at both micro and macro levels even long before diagnosis.)

One way to look at PD is to imagine an old fashioned child's top. You would wind a string around it and secure one end of the string to your hand and leave the other secured simply by the wrapping itself. Then, with the right flick of the wrist, you would set the top to spinning. After some initial wobble it would become almost magically stable and could continue spinning even as a child's hand sought to test its limits. Eventually it would begin to lose spin and go slower and slower. Wobble and vulnerability increase and recovery becomes less certain. A child's pudgy finger or a heat wave becomes a challenge and a threat. Each day begins with a certain amount of spin and that amount gradually declines over time.

There are many challenges to maintaining our spin / our balance / our homeostasis. We generally label them as "stress", take the bit in our teeth, and go on. A big mistake for most of us. Pamper yourself. Neither too hot nor too cold. Just right. The Goldilocks Disorder.
-Rick