Reply To: Using Air Conditioners Is Assur

There are many heilege rabbonim who has paskind that anything that didn’t exist at the time of briyas ha’olam is per se assur to derive any benefit from. There are some rabbonim who a makil and have moved the timeline forward and said that the benchmark should be to assur anything that was invented or adopted subsequent to the golden age of yiddishkeit in the pre-War Alte Heim.