Investing in rental properties can generate passive income, but operating costs may reduce profits. Refinancing a rental property mortgage can help minimize these costs by lowering interest rates, reducing payments, or accessing equity. To qualify, owners typically need good credit and at least 25% equity. The refinancing process involves evaluating finances, comparing lenders, and understanding costs. Factors like current market conditions and the property's financial profile should be considered before deciding to refinance, as fees can outweigh potential savings.