How your previously amortizing closing costs are treated, depends on the source of the refi loan.
If you refi'd through the same lender, then whatever you have left to amortize on the old loan, gets added to the amortized costs of the new loan and that new total is amortized over the life of the loan. (Or is it 15 years? I'm honestly not sure on the time frame.)
If you refi-d through a new lender, then the remaining costs to be amortized on the old loan are fully deductible in the year of the refi.
