Refinancing with a new interest rate or loan term can be a great way to save money on your mortgage.    

A lower rate means lower payments
If rates have fallen since you took out your current mortgage, refinancing now may get you a lower rate.  That means your monthly payments will go down, assuming the interest rate is all that changes.

Lower payments are great, but will they actually save you money?  That depends on the cost of taking out a new loan, how long you plan to stay in your home, and how much less you will be paying each month. 

Get lower payments with a longer term
Another way to reduce your monthly payments is to lengthen your loan term, which is the length of time you spend repaying it.  With your payments spread out over a longer time period, each one will be smaller.

The drawback to this approach is that because you will repay the mortgage principal more slowly, you may end up paying more interest overall. 

Shorten your loan term to pay less interest
You can reduce the total amount of interest you pay by shortening your loan term.  With fewer monthly payments required to repay the loan, each payment will reduce the balance by a larger amount.  As your balance decreases more rapidly, so will interest charges.

Besides reducing your interest costs, a shorter loan term helps you build equity faster.  That means you'll have a growing source of wealth to draw from when you need it.