re: Is it too late to refi?

I guess you have to run the #s. 4.149 APR would be the best rate you could find right now on a 30 yr fixed. That rate would have to be 4.0 or so with the APR at 4.149. With transaction costs, you would probably need to be committed to staying in that house for 10+ years to realize any significant benefit. If you are refi-ing into FHA the mortgage insurance thing would be huge though.