Kathy, though we have had the mildest and most wet summer in my memory, I have had the same experience. No more, no less.
I live outside Columbia SC, and we have not had a single day with a 120 heat index. We did have a few near 115, but that was shortlived and this summer. April was beautiful.
If I had to run AC or misc. for my birds, I would start over and find new ones. Fresh air, shade, and cool water is all mine will ever get. I have never lost a bird to the heat, though someone right down the road lost several this year.
The post was concerning Delawares tolerance of heat, and I have had an intelligent person tell me that theirs was the least tolerant. In my conditions I have not been able to tell the difference among the breeds I have kept.
Normally heat is a concern here, but other than two weeks, it has not been this year. This morning and yesterday it felt like fall.