So Bernanke refinanced into a loan with a higher interest rate and with a larger mortgage payment for the security of a fixed rate. This suggests he thinks fixed mortgage rates have bottomed (otherwise he could have paid less on his mortgage, at a 3.75% interest rate, and then refinanced next year). He did not "have to do it".
From TIME Magazine: Person of the Year 2009 Extended Interview
TIME: Do you have a mortgage?
Bernanke: Oh, yes, we refinanced.
TIME: Oh, perfect. When?
Bernanke: About 5%. A couple of months ago.
TIME: Good time.
Bernanke: Yes. We had to do it because we had an adjustable rate mortgage and it exploded, so we had to.
TIME: So, did you get a fixed rate at 5%? I think this might be the most valuable piece of information. (Laughter.)
Bernanke: Thirty years fixed rate at a little over 5%.
At least he was smart enough to know that mortgage rates aren't going to be lower in the proverbial "future." Now about the handling of the dollar and the unemployment rate.. another post entirely.