Cheap Mortgages Have Sparked A Serial Refinance Trend; Should You Join?

Homeowners eager to lock in lower monthly mortgage payments have discovered serial refinancing, a practice last in vogue during the housing boom.

To keep up with falling rates, almost 2.2 million homeowners have refinanced their mortgages at least twice since 2009, according to data compiled for The Wall Street Journal by SMR Research, a mortgage-research firm in Hackettstown, N.J.