Architectural studies re-orient through traditional architecture because of the energy crisis. The purpose of this study is to examine the architectural design parameters of traditional dwellings in terms of energy efficiency for future housing design in a hot humid climate. The case of this study is the 19th Century İzmir Houses. Two base case buildings with two and single-story were determined. Onsite measurements were taken from these buildings to identify the building material properties and to understand their thermal behavior. They were modeled and simulated with the DesignBuilder energy simulation program. The calibration and validation processes were conducted on these models. Two and single-story 114 types of İzmir Houses were modeled using the base drawings of the actual examples of these types and the validated material properties of the base case buildings in two different settlements where they are most frequently seen. The energy consumptions of these models were simulated. The statistical analyses were applied to examine the relationship between the source energy consumption per square meter and the design parameters of İzmir Houses. The design parameters such as the location of the hall, plan type, the existence of the basement, window to wall ratio, wall to floor ratio, window to floor ratio, total building area, wall to volume ratio, settlement pattern were found effective on the building energy performance. The least energy-consuming two-story İzmir houses type has a basement and side hall plan while the single-story house has a basement and central hall plan.