Malaria transmission in the evening before bedtime or outside a protected enclosed space is called residual transmission. This study aims to evaluate the efficacy of deltamethrin impregnated screens (55 mg/m2) against residual transmission in Yopougon, southern Côte d'Ivoire. A KAP survey was conducted among the local population on the vector control methods use by them and their perception of malaria. Human landing catch was carried out on the facades of three types of houses: (i) houses with impregnated facades, (ii) houses with permanent screens around the facade, and (iii) house with alternating screens around the facade (every two days). The results obtained showed that impregnated mosquito nets reduce human biting rate by 50% and the vector capacity by 75%. With regard to the vector's cycle of aggressiveness in houses without nets, vector bites start at 8 p.m. compared to 11 p.m. in houses with treated nets; these screens therefore delay vector bites until sleep time (11 p.m.) instead of 6 p.m. to 8 p.m. In addition, permanent use of these nets offers better protection against mosquito bites than episodic use. These screens are therefore proving to be a promising means to control outdoor malaria transmission.