[Avodah] Cameras and AC on Shabbas

[Harvey Benton]

Micha Berger wrote that RDCohen said that opening a front door on S (air cond) is different than  possibly triggering the cooling mechanism on a manual water fountain.  Why is it different?     Also I read online that R. Moshe said that the issue of Ktav on S doesnt apply bc the Ktav on video cameras isnt durable.... but nowadays vcameras record their images onto DVDs or VHS which IS durable... so wouldn't that be a problem?