This paper first presents the characteristics of a new experimental set-up using digital image correlation and infrared thermography. The kinematical data are used to track the temperature variations of material surface elements. Temperature and strain fields are then combined to construct local energy balances. To illustrate the interest of such an approach, the calorimetric effects accompanying the propagation of the necking zone in a PolyAmide are first shown. Secondly, when this specimen is cyclically loaded, energy data aims to show the existence of a so-called entropic elastic effect generally associated with rubber-like materials.