Hi, welcome! I am extremely sensitive to heat, but it has never caused a "real" exacerbation, only a worsening of symptoms or what they call a pseudo-exacerbation.

I tried to rake for a few minutes in our surprise 80-degree weather the other day, and I was suddenly weak, wobbly, foggy-brained, etc. It went away after I cooled off. Sometimes it goes away in a few minutes; sometimes it takes a few hours. Sometimes I have that "just got over the flu" feeling for up to a day. Who knows why.