Lenders sometimes offer a temporarily discounted interest rate for home equity lines—a rate that is unusually low and may last for only an introductory period, such as 6 months.

Variable-rate plans secured by a dwelling must, by law, have a ceiling (or cap) on how much your interest rate may increase over the life of the plan. Some variable-rate plans limit how much your payment may increase and how low your interest rate may fall if interest rates drop.

Some lenders allow you to convert from a variable interest rate to a fixed rate during the life of the plan, or to convert all or a portion of your line to a fixed-term installment loan.

Plans generally permit the lender to freeze or reduce your credit line under certain circumstances. For example, some variable-rate plans may not allow you to draw additional funds during a period in which the interest rate reaches the cap.