Just a few decades ago, refinancing a home loan was relatively unknown. Most people decided to buy a house, got a 30 year, fixed-rate mortgage, and made monthly payments until the loan was paid off. Times have changed, however, and in today's mortgage market, most new loans are more likely than not to be refinanced sooner or later. Today the average loan, even one issued for 30 years, is unlikely to last more than 30 years, as owners often exchange one loan for another one.

The reasons are many, and all of them are valid. Here are a few of the circumstances under which an owner might wish to refinance his or her home loan: