Sektor konstruksi dan real estat berkontribusi terhadap konsumsi energi global serta pentingnya Kualitas Lingkungan Dalam Ruangan (KLDR) bagi kesehatan pengguna fasilitas kesehatan. Penelitian ini mengembangkan model penilaian kinerja KLDR karena belum adanya model penilaian berbasis kepuasan pengguna yang komprehesif di rumah sakit kelas D. Penelitian ini menggunakan metode mixed-methods (kombinasi) melalui survei, observasi, dan pengukuran fisik di tiga rumah sakit kelas D di Indonesia. Hasil rata-rata Intensitas Konsumsi Energi (IKE) adalah 244 kWh/m²/tahun, melebihi rata-rata nasional (180,81 kWh/m²/tahun), menunjukkan ketidakefisienan energi. Prioritas perbaikan faktor KLDR berdasarkan persepsi penting dan kinerja (subjektif dan objektif) meliputi suhu, kecepatan angin, cahaya alami, kontrol pencahayaan, kualitas udara, pertukaran udara, tingkat kebisingan, kebersihan, dan ukuran ruang. Hasil survei terhadap kepuasan (178 responden) menunjukkan kualitas termal, udara, visual, dan akustik tidak berpengaruh signifikan terhadap kinerja KLDR. Kesimpulannya, model penilaian yang dikembangkan menjadi kebaruan adalah kualitas interior signifikan terhadap kinerja KLDR (47,6%) dan kepuasan keseluruhan pengguna (15,7%).

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The buildings and construction sector contributes to global energy consumption, highlighting the importance of indoor environmental quality for the health of healthcare facility users. The absence of a comprehensive assessment model to evaluate Indoor Environmental Quality (IEQ) performance based on user satisfaction in class D hospitals led to the objective of this study: to develop an IEQ performance assessment model. A mixed-methods approach was employed, with data collected through surveys, observations, and physical measurements at three class D hospitals in Indonesia. Results showed that the average Energy Use Intensity (EUI) of class D hospitals was 244 kWh/m²/year, exceeding the national average of 180.81 kWh/m²/year, indicating energy inefficiency. Key IEQ improvement priorities, based on importance and subjective-objective performance, include temperature, air velocity, natural lighting, lighting control, air quality, ventilation, noise levels, cleanliness, and room size. A survey of 178 respondents revealed that thermal, air, visual, and acoustic quality did not significantly influence IEQ performance based on user satisfaction. The developed assessment model highlights that interior quality contributes significantly to IEQ performance (47.6%) and overall user satisfaction (15.7%).