Traditional architecture is an architectural form that passed down from one generation to the next. Traditional houses are formed through a long time that are responsive to the environment. The traditional houses adapt with the environment to increase their level of comfort and reduce disturbances for a comfortable living. This study aimed to identify the thermal comfort of Betang Ensaid Panjang, which is the traditional Dayak houses in Sintang Regency. Identification of the thermal comfort was done by measuring the influential thermal variables; air temperature, humidity, wind speed, the clothing insulation and the metabolism at Betang Ensaid Panjang. As a building that located in a tropical climate, an analysis of the tropical architecture theories was carried out at Betang Ensaid Panjang. The results of the analysis become the hypothesis that the building applies the principles of humid tropical architecture. Based on PMV and PPD analysis by ASHRAE 55 Standard, it can be identified that the Betang Ensaid Panjang have different levels of thermal comfort in ruai, bilik and tingkak at different times. In the morning it can be identified as slightly cool, in the afternoon and evening, can be identified as slighltly warm and at night, it can be identified as neutral or comfort.

Malays are one of several local ethnicities who inhabit the island of Kalimantan. Malay architecture can be linked to elements of customs, culture, and tradition that develop within the growth of ethnicity toward community development. Furthermore, many reports found that the characteristics of the environment and the settlements' location make a difference in the Malay house's traditional architecture on the island of Kalimantan. The study identifies some differentiation by the effects of cultural factors in each area of traditional architecture, affecting the architectural elements. The influences to Malay architecture are found differences by each region's customs, culture, and tradition. The Malays' customs, culture, and tradition greatly influence Malays houses' architecture because the culture is robust. This influence has made the customs, culture, and tradition become an obligation embedded in every Malay society. The embedded influences to the traditional Malay houses are found in the orientation of the openings, spatial arrangement, structure, and construction. The factor of being a Malay makes people attaching a unique meaning to the architecture of a traditional Malay house. The meanings follow the belief in environmental conditions and simplicity in Islamic teachings in traditional houses.