As interest rates fluctuate, you might think about refinancing your mortgage. This is the cost of taking out a new home loan to replace the one you currently have. If you get a significantly lower interest rate, you could save tens of thousands of dollars over the life of the mortgage. On the other hand, you need to think about potential expenses you might incur during the refinancing process. Because you are taking out another home loan, you may need to pay closing costs a second time. What are some of the most common expenses you might have to pay?…