Dang ya'll got me rethinking this whole deal, and may very well not be sending any invoices. My buyers attorney (whom just by chance I've known my whole life) mentioned on the phone that they were trying to pin this on the seller. Also should have noted that I inspected the house in May of 2010, they bought the house and didn't notice the water in ducts til November of 2011, and were just now calling me in June of 2012. I mentioned in 3 places in the report that water could be entering the house from different places, but made no mention of wet ducts because they were not wet when I inspected the house. I do have an attorney prepared inspection agreement signed by my client which limits my liability to 180 days and on top of that the statute of limitations in Arkansas is 1 year from date of inspection. Really hoping this blows over, I do not want to go to court.