In article ,
Robert Green wrote:

....
Yeah, all sorts of crap lands on the A-coil when it's wet and by the time
you start running really hot air over it from the furnace on the first cold
day it starts a stinkin'. I live across the street from a firehouse and the
first really cold night will have maybe 10 alarms running for smoke smell
calls.

What's an "A-coil"?

Thanks,

David