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Is this mortgage advice good, or is it hooey?
I think the idea here is that because of the way mortgages are amortized, you can drop additional principal payments in the early years of the mortgage and significantly lower the overall interest expense over the life of the loan. A HELOC accrues interest like a credit card, so if you make a large principal payment using a HELOC, you will be able to retire those "chunks" of debt quicker than if you made normal mortgage payments. I haven't worked out the numbers, but I suspect that you could achieve similar results by simply paying ahead -- making even one extra payment per year will take 7-9 years off of a 30 year loan. I think that the advantage of the HELOC approach is that if you borrow enough, you may be able to recalculate/lower the payment of the mortgage.