A control device for a thermo-electric device having a heat source side and a heat sink side. In a presently preferred embodiment, the low tensile set polymer is an elastomer selected from the group consisting of a silicone-polyurethane copolymer and a diene polymer. Related fabrication processes are presented for similar device embodiments based on a Group III-V semiconductor material and silicon-on-insulator materials. Thus, an auxiliary heat-insulating jig necessary for modifying a high-speed temperature-control heat treatment apparatus of an intermediate temperature specification to a high-speed temperature-control heat treatment apparatus of a high-temperature specification is provided.