I just read a statistic from the US Department of Energy, A Field Study to Characterize Fault Prevalence in Residential Comfort Systems, that about 65%-70% of coolent leaks in your HVAC system occor in the evaporator coil. They believe the reason is because people use vinegar and bleach products for cleaning causing premature corrosion of the evaporator coil. But I know there are many hear in the Villages who have used these products for over 20 years and never had a problem and it's because they had an older system. I'll bet if they opened the airhandler and looked at the evaporator coil there would be significant corrosion. On the newer systems the coil material is different so they only recommend hot tap water.
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