Often when rates have fallen enough to offset the closing costs within the time you plan to stay in the home. Check the break-even time before you apply.

It lowers the monthly payment, but it usually adds interest over the life of the loan, so compare the total cost as well as the payment.

Lender fees, appraisal, title, and recording charges are common. The Loan Estimate from each lender lists them, so compare those lists directly.

Some lenders allow it. That lowers the cash you pay upfront, but it adds interest to the loan, so the break-even time gets longer.

Applying can cause a small, temporary change in your credit score. Keep the number of applications small, and check how your lender handles them.