How do you decide when to refinance?

[John Chace]

I bought my first house (owner occupied 3 family) last year and starting to wonder if I should refinance it since I bought it using an FHA loan with 3 percent down-payment. Per Zillow it is estimated to be worth an additional 100k right now. I also did some work to it so I know it's worth more. My current rate is 3.25 percent. How do you go about deciding when to refinance? When is it not worth it? Do you use a broker or pick the banks? Or any other useful tips I should know? Thanks in advance.