If I move into one of my rental property and use it as a primary residence, how soon can I refinance the mortgage as a primary residence and therefore better interest rate? Thank you.
Go ahead and reach out to your banker/lender. If there is a title change involved it is like you are purchasing the property and should be immediate. If there is no title change involved and it's in your name, then as long as there have been 6 months since the last financing, you should be good to go.