Alexander M. Reynolds. “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, no. 09 (September 30, 2025): 132–135. Accessed February 18, 2026. https://theusajournals.com/index.php/ajast/article/view/8400.