This was a popular attitudes in the 80s, and 90s, until Google, Intel and others did some research and discovered that Cold data centers aren't the be-all/end-all.

After reading the research I kept on the order of 100 servers in a server room at approx. 80 degrees for a couple years, and didn't see any devices fail.

I don't think anyone in the last 10+ years has believe that "servers are expected to keel over at 75F"