that's probably because @ 110v to produce the same output the conditioner needs to draw more current than at 240v. Same for a psu. Lower voltage = higher current for the same amount of work. So possibly, no. it would actually be
less efficiant because more current = more heat, if anything.
over-head power cables run at extremely high voltages because you can get away with using less current, and in this instance less current = loss energy loss due to heat, amongst other things.
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