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I'm on the fence on that. It's not a huge expense though, and you only have 6. For 8 it's probably $175 at least, depending on brand. Maybe more. I think about that sort of purely preventative maintenance sorta the same as I think about extended warranties - how much is a little peace of mind worth to me. With warranties my answer is always "not much" so we'll see if I replace coils.
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