I just did this! I was five years into my current mortgage at 4% interest and decided to investigate refinancing. I checked 15, 20, 25, and 30 year refinance options. The 25/30 could get me a 3.25% interest rate, the 20-year was 3%, and a 15-year was 2.75%. I went with the 20-year, which is cutting five years off my…