Karunathilake, WKUVHalwatura, RUPathirana, SM2022-09-012022-09-012018-05W. K. U. V. Karunathilake, R. U. Halwatura and S. M. Pathirana, "Optimization of Thermal Comfort in Sri Lankan Residential Buildings," 2018 Moratuwa Engineering Research Conference (MERCon), 2018, pp. 150-155, doi: 10.1109/MERCon.2018.8421978.http://dl.lib.uom.lk/handle/123/18823The aim of this study is to evaluate the thermal comfort state in residential buildings in Sri Lanka and to study the possibility of getting them into the comfort zone without air conditioning. Located near the equator, Sri Lanka has a tropical climate with high temperature and relative humidity level. Therefore, the need of having a thermally comfortable living environment is a must in these conditions. A case study approach has been made in this study to evaluate the research problem. The selected 14 case study houses were optimized using Design-Builder, energy simulation software. The evaluation results highlight that the comfort level of the houses can be improved using mud concrete blocks as the external wall material and clay tiles as roofing. The optimisation results further indicate that thermal comfort level of the residential buildings in Sri Lanka can be achieved without using air conditioning if designed properlyenoptimisationthermal comfortresidential buildingsnatural ventilationDesign BuilderConference-Full-textEngineering2018pp. 150-155upekshavirajini@gmail.comrangikauh@gmail.com,shakila205@gmail.com10.1109/MERCon.2018.8421978