Listed below are some of the possible causes of leaks:
· Corrosion of tubes (“formicary corrosion”) increasing due to “tighter” house construction. Corrosion causes pinholes in the copper tubes
· Corrosive gasses or fumes from defective drywall or other building materials, contents, or household chemicals.
· AC coils being made of thinner-walled, lighter gauge copper
· Higher operating pressures in newer equipment
· Manufacturing defects in tubing