People here are talking like a lightning strike is the only threat. Several years ago in Virginia where we lived, our A/C went out. The repair guy said the condenser capacitor had given out - probably because of small power spikes over the years. He said if there was a thunderstorm to turn the A/C off. I don't know how effective this strategy is but there is another consideration. Back in the 20th century, I was an IT guy. Whole-house surge suppressors were advertised as paying back their cost over several years by stopping short over-voltages and therefore the amount of power your house was using thus saving you a couple of pennies every month.
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