Air curtains are devices used in refrigerated display cabinets and the entrance of air conditioned spaces is aimed to reduce the breakthrough of heat, moisture and contaminants between the conditioned environment and the surrounding ambient, consequently reducing energy costs. The main objective of the present work is to study the parameter affecting the performance of air curtains used in viewer refrigerators using one and two air curtains at different ambient conditions, in order to reduce the air infiltration and consequently the energy consumption. The results of one and two air curtains are compared, where two air curtains are more effective than one air curtain