Can a person refinance a home equity loan, as opposed to a refinancing a mortgage? ?

A couple of years ago, my spouse and I doubled the size of our home which we had owned “free and clear.” To do so, we took out a 20 year home equity loan for $ 250,000 at a rate of 5.85%. Since we already owned the home and this was technically not a mortgage, there was no downpayment on this loan. With rates coming down, do we have any hope of refinancing our home equity loan? Or, is refinancing basically restricted to mortgages? Thanks.