Alexander M. Reynolds (2025) “Advanced Predictive Maintenance and Smart Indoor Air Quality Management in HVAC Systems: Integrating IoT, Machine Learning, and Industry 4.0 Frameworks”, American Journal of Applied Science and Technology, 5(09), pp. 132–135. Available at: https://theusajournals.com/index.php/ajast/article/view/8400 (Accessed: 18 February 2026).