A new insecticide formulation with deltamethrin as an active ingredient (F1) has been developed in order to suppress the worldwide spread of mosquito-borne diseases. The formulation is naphtha-free and utilises locally sourced palm-based materials to obtain a cost-effective product. The objective of this study is to assess the performance of the formulation, in terms of droplet size and efficacy, in comparison to a commercial naphtha-based insecticide (F2). Open-field bioassay of the formulations against adult Aedes aegypti was conducted using cold and thermal fogging methods and measured at distance points 25, 50, 75 and 100 m. Overall, droplet size and efficacy significantly decreased with increasing distance from the spray path. No significant differences in volume median diameter (VMD) were observed between fogging methods and formulations. In general, both formulations showed significantly higher efficacy as cold fogs than thermal fogs. Significant differences in knockdown effect were observed between methods, time and formulations. Nevertheless, the definite effect of insecticidal formulations, i.e. mortality, was not significantly different between F1 and F2. In conclusion, our results show that the palm-based formulation was able to achieve comparable performance with the commercial formulation without the use of naphtha.