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Interesting, I have 4 S5's in the basement and it was in the 80's last week, but the basement wasn't too bad. I don't think the S5's heat up as much as the S3's...but I have 4 S5's compared to the 8 S3's I had in the past. And as long as bitcoin is profitable, I'll continue to run those S5's....until the next gen comes out of course.
I have 2xS3 and 1xS5 that are still running.
The S5 runs 24/7 but the S3s are off during peak electricity cost (~50c/kWhr)
The S5 is usually blowing cool air out of it - they default the fans way higher than needed - so I had almost no problem with it during summer.
The S3s fans are slower and also warmer air coming out of course.