Obviously ask your accountant, however, I believe you would simply stop claiming it as an investment and start as a primary residence, which would probably be worse for tax purposes since you can now only deduct property taxes and mortgage interest instead of all costs.
If you are truly living there, you should have changed all utility bills over to your name and change all mailing addresses to the new residence for anything of importance (your employer, town hall records, bills, drivers license, pistol permit, etc).
There is no way a refinance is part of the process unless you wish to do so for other purposes.