When a house has central AC, there is typically an
evaporator installed over the furnace. Since the tubes and
fins are shaped some what like a capital A, they are fondly
called A-coils. The term "coil" is because the early
evaporators and condensors were coils of copper tubing.

There are also W-coils, though they look more like M-coils.

--
Christopher A. Young
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"David Combs" wrote in message
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What's an "A-coil"?

Thanks,

David