If it is one thing I learned throughout the past 7 years with RSD...

No case of RSD is exactly the same (thus the reason soooo hard to treat)

Personally I am VERY sensitive to the cold... And during the summers here I do much better. Hot water feels like hot water on my good leg and hot water feels like lukewarm water on bad leg... so for me its not the extreme of Hot water to cold water but there is definitely a big difference in temperature..

-Heather