If you are paying private insurance on your current mortgage, refinancing may allow you to do away with this unnecessary expense.
If there is a big difference between the initial interest rate and the APR listed in the ad, it may mean that there are high fees associated with the loan.
These days most people request a Good Faith Estimate (GFE), but have no clue what to look for on the GFE. Make sure you request a GFE that has ALL fees estimated and disclosed. This includes: origination points, processing, lender, appraisal, title, escrow... ALL FEES... especially the Yield Spread Premium or YSP.
If you have a mortgage, you should keep an eye on rates-especially if you have an adjustable rate mortgage. Getting locked in at a lower, fixed rate can save you hundreds, possibly even thousands, of dollars over the life of your loan.