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@TechConnectify There’s no reason for the air handler to be in the attic except for space saving and perhaps noise issues(?). That wasn’t common even 20 years ago. Ductwork is in the attic because there’s no other place for it to be if you are slab on grade. You can make the case that you should still have a crawl space even if you don’t need a basement to get below frost heaving, but for whatever reason, that’s just not a thing here anymore. I’m not sure why.