Ideas and methods of A.V. Tsirul'skii that have found application in gravity and magnetic inverse problems are adapted for the solution of stationary thermal problems in piecewise homogeneous media. For a simply connected region bounded by a regular analytical curve (K-parametrized, after Tsirul'skii), a closed solution to the boundary-value problem oftemperature ad ' justment in the forin of Cauchy integrals is derived. Piecewise analytical branches of Cauchy integrals on a Riemannian surface of symmetry solve the external and internal boundary-value problems of adjustment.