It's normal for an alternator to put out 14.5 volts, if the battery is short of juice and demanding a high level of charge, however, if it is doing it constantly I would get the battery load tested to see if its holding its charge ok.
It may simply be that the air con is working hard and drawing a lot of juice from the alternator, but it's worth checking the battery, just in case.
Good quality chargers like Ctek will always do a better job at caring for the battery than the alternator will.
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