Abstract Objective: Library users beside been under duress of the inherent academic challenges are also faced with acclimatiz- ing to the environment around them. The paradigm shift in environmental satisfaction research pits users against the dynamic nature of the environment. Hence, this paper directs the need for adequate post-occupancy analysis to address this trend. Methods/Statistical Analysis: A total of 514 questionnaires were derived from 4 respective libraries in North- eastern Nigeria. Descriptive and Structural Equation Modeling (SEM) analysis were carried out with SPSS and AMOS v22. Findings: The results revealed that the variables exhibited high correlation among each other. Ventilation Satisfaction had the highest impact on environmental satisfaction while acoustic had the lowest impact on environmental satisfaction. Applications/Improvements: Recommendations on policies were given to improve Acoustics within the Libraries. A Users’ Satisfaction on the Environmental Performance of Naturally Ventilated Library: A Structural Equation Modeling Approach El-Nafaty Abbas Said 1,2* , Mohd Hamdan Ahmad 1,3 , Malsiah Hamid 1 and Wallace Imoudu Enegbuma 4 1 Department of Architecture, Faculty of Built Environment, Universiti Teknologi Malaysia, Skudai - 81310, Johor, Malaysia; malsiah.hamid@gmail.com 2 Department of Architecture, Faculty of Environmental Science, Abubakar Tafawa Balewa University Bauchi (ATBU), Nigeria; elnafatyabbas@gmail.com 3 Institute Sultan Iskandar, Universiti Teknologi Malaysia, Skudai - 81310, Johor, Malaysia; b-medan@gmail.com 4 Department of Civil Engineering, Faculty of Engineering, Computing and Science, Swinburne University of Technology, Kuching - 93350, Sarawak, Malaysia; wenegbuma@swinburne.edu.my Keywords: Library, Nigeria, Performance, Structural Equation Modeling, Questionnaire Survey, User Satisfaction 1. Introduction Oices and managers of facilities are constantly faced with the challenges of addressing the pressure of allocation of spaces to stafs and users in a loor plan to reduce overall cost on the establishment. However, reduction in spaces for each individual, groups or functions leads to high risk of creation of unpleasant working environment to carry out functions efectively. he adverse environmen- tal conditions produced are increased noise, obstruction of air circulation and lighting which invariably leads to hindrance on privacy and increased work stress 1 . Indoor Environmental Quality (IEQ) varies from location to loca- tion in higher education facilities 2 . Due to high demand in balancing energy consumption towards a sustainable energy, higher education facilities are constantly faced with challenges of monitoring facilities to comply with international standards 2,3 . he paradigm shit in rating systems of Leadership in Energy and Environmental Design (LEED) and Building Research Establishment Environmental Assessment Method (BREEAM) has led to an increase in standardizing IEQ to improve library user satisfaction 2 . Minimizing the efects of indoor pol- lutants is a priority in building design as Americans spend on average 90% of their time indoors where the Environmental Protection Agency (EPA) reports those levels of pollutants may run two to ive times and occa- sionally more than 100 times higher than outdoor levels4. *Author for correspondence Indian Journal of Science and Technology, Vol 9(46), DOI: 10.17485/ijst/2016/v9i46/107130, December 2016 ISSN (Print) : 0974-6846 ISSN (Online) : 0974-5645