An excerpt from an MSN article:

Some Mortgage Rates Will Rise

Contrary to popular belief, not all mortgage rates are directly related to the decisions of the Federal Reserve Board. Adjustable rate mortgages and home equity lines of credit will be most impacted by the Fed rate hike, but most 30-year, fixed-rate mortgage rates are based on the 10-year Treasury bond, according to The New York Times. Prices are determined according to a number of factors, including long-term economic growth, inflation outlook and short-term interest rates.

If you have an ARM that currently has annual readjustments or will soon, you might want to consider refinancing it to a fixed-rate mortgage now because doing so could save you a significant amount of money in the future. Conversely, if your adjustable-rate mortgage rate is locked in place for a few years, it’s probably best to wait and see what the future holds.

HELOCs will likely rise with the Fed funds rate to an approximate average of 5.5 percent, reported The New York Times. Locking in a fixed rate tends to result in a rate increase, so take the size of your loan and the amount of time you plan to pay it off into consideration before making a move.