I was hoping someone might have an ansewer to a problem I'm having with an American Standard coil. The coil to this unit has been replaced 6 times and is needing to be replaced again. Thank goodness for the extended warranty. My A/C man tells me that he doesn't know what is causing the failures with each one but they all develope leaks in less than a year. We live in Pleasanton Texas. We are just your average family with no use of anything I can think of that might cause this thing to keep failing. It is a 3.5 ton heat pump unit with the air handler in the attick. The unit is now 8 years old and I think must be a lemon. It was one of American Standards fancier units when we purchased it. I would appriciate any input. Thanks.