Er, liquid nitrogen is expensive and unstable. Plus, most things put in liquid nitrogen will become brittle and shatter. That includes living organic things...you can freeze/shatter leaves and whole fish. You'd need to somehow find a way to dip all of your furniture into liquid nitrogen vats for long enough to freeze out the bugs without causing the wood to warp and break, electronics to shatter, and so on. Oh, and keep the nitrogen at the -70C for the duration to keep it from evaporating.