NC: You asked what circumstances changed? Part of the zizul shabbos issue is the noise made by the appliance. Back in the 1970,s not every house had air conditioners and if they did, it was not in every room. It was still a luxury and not as today we deem it a necessity. In addition, the units themselves are much quieter today then in the 1970’s. These are the “circumstances” that have changed. Would or should it have an effect on the psak? I don’t know but it was Rabbi Reisman who told me that it is possible.
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