Refrigerant injection techniques are considered as modifications to vapor compression refrigeration systems to improve the performance of these systems when operating at high or low ambient temperatures. In this study a liquid and vapor refrigerant injections were implemented using heat exchangers arrangement. An investigation to the effects of these techniques on the performance of refrigeration cycle was conducted. A decrease in discharge temperature was obtained using hybrid injection cycles from 20% to 19% when the ambient temperature varies from 14C to 8C. Also the decrease in pressure ratio varied from 24% at an ambient temperature of 14C to 18% at 8C. The enhancement in performance factor varied from 35% at 14 C to 28% at 8 C.