Dass yachid:
No, I don’t think a timer being built into the appliance would make it muttar according to R’ Moshe. If you programmed a built in timer to turn on the a/c at 11pm Friday night, for example, the a/c’s operation is beginning at 11pm.
If, however, you turn on the a/c before Shabbos, and the compressor happens to cycle on at 11pm, that is considered a result of what you did on erev Shabbos.
—————————–
Based on what you wrote i have a hypothetical question:
Suppose i have a ac running all week long . Goes on at different intervals throughout the day/ night via a 24 hour timer. According to reb moshe would i need to disconnect it before shabbos or can i let it run through out the entire week including shabbos.