I recall back in the 90s when whole house surge protectors were coming out hearing that they actually paid for themselves over some period of time. Not by protecting anything (although they did that) but by reducing your electric bill slightly every month. The power coming in from the street fluctuates slightly and by limiting the over voltages you are not paying for that which your appliances happily consume even though they don't need it. We're talking small change here but over time it adds up.
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