Coil Conundrum

[heatrcool]

Here's a question for all you good-ole-boys down below the Mason Dixon Line. A couple weeks ago, a friend who owns a condo in Florida called me from there for a second opinion. His unit which is about 11 years old, was down (low on charge), so he called a local guy who was respected and known by others in the complex. This guy spent all his time (about 20 minutes) working on the condenser. He then announced that the evap coil was bad - how he ruled out the lineset and other solder joints in between I have no clue. Here's where it gets hinkey. Bubba said that this "corrosion" was caused by leaving the unit set on "de-humidify" while vacant rather than set to a specific temperature. They are about 4 miles from the coast. Is this guy referring to formicary corrosion? If so, the research I've done does not indicate that this is caused by coastal environments. If not, what's he talking about? I'm just a dumb cracker, but I ain't never heard a no "southern fried corrosion" before. Just to punt away from the end zone, I suggested he request a tin plated coil. Anyone want to weigh in?

[BaldLoonie]

Does sound a little hokey. But evap leaks are very common all over the place, not just a south thing.