Refinancing Primary and Rental Property?

refinancing

I want to refinance the rental property I bought in 2007, because it’s rate will change by June 2011. But since rates are low these days, I am considering on refinancing our primary (our home) property also. My loans are with 2 different banks. My questions: 1) Is it wise to refinance them at the same time? 2) If it’s okay, should I do it where I currently have my loans? 3) Should I talk to 1 bank and have them refinance both loans? Please help. Thank you!