That would depend on the rate and terms that are being offered to you on the 'owner financing'. And whether or not you are on a 'contract for deed' or if the property has been titled into your name and a note and mortgage filed. The details of your current arrangement would dictate that answer. Interest rates are at a historic low so it would certainly be worth investigating. There are a number of loan types, each of which will have different costs associated with them so just be sure that you investigate your options with someone reputable.