Why is it so common—particularly in warm climates—to find air conditioning ducts, and even air handlers, in the attic? Isn’t it hot as hell up there? It seems counterintuitive to route the cool air intended to condition a home through that space.It is, in a way. But as I’ve learned, there are good reasons for running the AC through the attic. The obvious ones: It’s easier to run supply ducts throughout a house that way, and it’s more affordable—attics on a house with a sloped roof typically don’t cost anything extra. (Compare that with running the supply ducts through basements—common...

-OR-