Yes, it is possible to refinance an existing mortgage through NationStar Mortgage. They offer various refinancing options, which may include conventional loans, FHA loans, and VA loans, among others. The specific terms and conditions for refinancing will depend on an individual's financial situation, current mortgage terms, and eligibility requirements. It is important for borrowers to consider their financial goals and whether refinancing will help them achieve those goals, such as reducing monthly payments, changing the loan term, or accessing equity in the home. For those interested in refinancing with NationStar, it would be beneficial to visit their official website, where they provide detailed information regarding the refinancing process and current offers, as well as guidance for potential applicants.