grants, and business case evaluations for retrofit or upgrade decisions. Orange Door Engineering also conducts energy audits ranging from basic walk-throughs to detailed whole building assessments that identify energy waste and recommend corrective measures. Its work covers residential, commercial, institutional, industrial, and healthcare buildings, with projects that analyze HVAC systems, cogeneration feasibility, and other mechanical upgrades. The company uses detailed system analysis and numerical modeling to help building owners choose technically and financially appropriate improvements.