i am concerned about the USA facing rapidly rising inflation in the coming years. If i were to refinance my home at a fixed rate for 4.875% over 20 years from PenFed.org, and then we had high inflation and rates went up to 14%- 17% or even higher like in the late 70's (i think) would i be locked in for sure for the whole 20 years, or is there some loophole for the banks? thanks.