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A home is an investment, sure—but as you pay down that mortgage, it starts to look more like a giant piggy bank. That’s why homeowners jonesing to remodel their homes, make a big purchase, or send their kid to college are rushing to take out loans against the value of their homes, before interest rates rise further.

The number of homeowners taking out a home equity line of credit, or HELOC, in the U.S. hit 347,875 in the first quarter of 2018, according to a recent report from real estate information firm ATTOM Data Solutions. That’s 18% more than the previous quarter—and 14% more than a year ago. (To come up with its findings, ATTOM analyzed publicly recorded mortgage documents and deeds of trust for properties up to four units. The value of the loans was calculated by multiplying the number of new mortgages, including HELOCs, by the average loan amount.)

Rising interest rates may be responsible for the boom, as higher rates cost homeowners more over the life of their loans. The Federal Reserve raised rates by 0.25% on Wednesday and is expected to boost them by the same amount at least once more, if…