Reply To: Using Air Conditioners Is Assur

The mitzius changed since R’ Moshe’s days. The ancient ACs were huge inconvenient machines which made a lot of noise and dimmed the lights during use. They barely made the air colder. I don’t even know if R’ Moshe was familiar with how they worked, but certainly the mitzius changed since then.
Anyway, since when do we go with every kulah we find? Are you machmir on R’ Moshe’s chumros too, or just his kulos? Do you set timers on ACs on shabbos? If so, you contradict yourself.
The Brisker Rav and R’ Tzvi Pesach Frank both didn’t have ACs; they obviously held they were assur, and also a lot of other gedolim.