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The temperature dependence of the enhancement factor for the dd reaction proceeding in TiD 2 and ZrD 2 is investigated. The experiments were carried out at the Hall pulsed ion accelerator (INP, Polytechnical University, Tomsk, Russia) in the deuteron energy interval 7.0 ÷ 12.0 keV and at temperatures ranging from 20 to 200 • C. The values obtained for the electron screening potentials indicate that the dd-reaction enhancement factor does not depend on the target temperature in the range of 20 ÷ 200 • C. This result contradicts the conclusions drawn by the LUNA Collaboration from their work.The investigation has been performed at the Dzhelepov Laboratory of Nuclear Problems, JINR.