QCD sum rules are based on the Operator Product Expansion of current correlators, and on QCD‐hadron duality. An extension of this program to finite temperature is discussed. This allows for a study of deconfinement and chiral‐symmetry restoration. In addition, it is possible to relate certain hadronic matrix elements to expectation values of quark and gluon field operators by using thermal Finite Energy Sum Rules. In this way one can determine the temperature behavior of hadron masses and couplings, as well as form factors.