Building designs that are being prioritized today are sustainable architecture and green architecture. The designs can reduce the energy consumption that has a positive impact on climate. Actually, the design of such buildings has started since the Dutch colonial era. Buildings from that era are very adaptive to the climate just using passive cooling system. Passive cooling became the best technology at that time to achieve thermal comfort and save energy. Church is one of the few public buildings requiring special attention to its thermal comfort. The churches built during the Dutch colonial era like every Cathedral Church succeeded in achieving thermal comfort. Some of Cathedral Churches like in Semarang and Bogor city have unique ventilation called low ventilation located at the bottom area of the wall. Research held in these two Cathedral Churches (Semarang and Bogor) in three periods of church services and some specified measurement items. Dry bulb temperature, effective temperature, relative humidity, and air velocity were measured to gain thermal condition. The purpose of this study was to examine building's thermal condition and low ventilation impacts. The results of this study showed that as the effect of low ventilations, there was a significant change on thermal condition inside the buildings. The measuring points near the low ventilation had lower effective temperature, relative humidity, and higher air velocity compared with others. This study provides insight into passive cooling system; in this case, low ventilation is essential part for sustainable architecture.

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<p>Kota Semarang masih memiliki bangunan yang menggunakan ventilasi bawah, salah satunya adalah Gereja Katedral Semarang. Pengukuran suhu udara, temperatur efektif, kelembaban udara, kecepatan angin, PMV (Predicted Mean Vote) dan PPD (Predicted Percentage of Dissatisfied)dilaksanakan pada 5 waktu ibadah dengan perlakuan yang berbeda untuk membuktikan bahwa ventilasi bawah dapat mempengaruhi kenyamanan termal. Disimpulkan bahwa titik dimana terdapat ventilasi bawah (titik A, C, G, dan I) memiliki temperatur efektif dan kelembaban udara yang lebih rendah dari titik lain, dan kecepatan udara lebih tinggi dari titik lain. Responden merasa nyaman pada keempat titik tersebut.Titik paling nyaman menurut responden adalah titik I dengan TE berkisar 24,95˚C, kelembaban udara berkisar 78,9%, kecepatan udara berkisar 0,28 m/s, PMV berkisar -0,09 dan PPD berkisar 16,8%. Dengan begitu keadaan ventilasi bawah terbuka terbukti mempengaruhi kenyamanan termal dan membuat kenyamanan termal dapat tercapai.</p><p> </p><p><br />Kata Kunci : Gereja, Ventilasi, PMV, PPD, Kenyamanan Termal</p>

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