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Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,758
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If replacing the entire system, you do not want the highest efficiency rating.
With the newer stringent energy codes, the only way manufactures are complying is by using thinner metals for faster heat transfer, which is why new systems don't last as long as older systems.
If there is a choice between 80% efficiency and 90% efficiency, I'm picking 80%.
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