The term "conforming" is most often used when speaking specifically about a mortgage amount; however, the terms "conforming" and "conventional" are frequently used interchangeably. Mortgages that exceed the conforming loan limit are classified as non-conforming or jumbo mortgages.
OFHEO, which sets the conforming loan limit on an annual basis, has regulatory oversight to ensure that Fannie Mae and Freddie Mac fulfill their charters and missions of promoting homeownership for lower income and middle class Americans. OFHEO uses the October to October percentage increase/decrease in average housing prices in the Monthly Interest Rate Survey of the Federal Housing Finance Board (FHFB) to adjust the conforming loan limits for the subsequent year.