I want to build equity with my primary home as soon as possible. And I came across a method using HELOC to reduce the interest paid to the mortgage. Does any one have experience with it?

I have a small house on 18 acres.   We have rented it out 5 times with no complaints.  In the last 4 years we we have totally renovated it adding a sun room, new HVAC, electrical, plumbing, and refinishing floors, ref...