assume you are investing in RE. Before you move out, you should refinance and get out as much cash as possible, paying the primary rate. (now around 3.25% 15 year, 3.75% 30 year. I missed that myself too)
After you moved out, if you refinance, your rate is much higher (around 4.75% now) for invenstment properties. You can still refinance, I guess.