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  Company Overview: Commercial Mechanical Engineer – HVAC (Mid-Level).   USA Mechanical & Energy Service has been in business since 2003  and is a top-rated HVAC-R service company. USA Mechanical & Energy Services continues to be a family business built on a reputation of dependable, quality, and trusted service completing projects on schedule. We are a full-service mechanical contractor providing 24/7 HVAC Service & Maintenance.   The company partnered with Orion Services Group in September 2021. Orion Services Group is a private equity-backed company focused on acquiring leading commercial field services companies in HVAC, landscaping, and other essential service industries. Orion partners with world-class, founder-owned service providers to build industry leading platforms that perform the essential services that keep America running. With their People-First approach, they aim to foster an environment in which the best talent and field technicians call home.   Position Summary: The Mid-Level HVAC Mechanical Engineer is responsible for the design, analysis, and implementation of heating, ventilation, air conditioning systems & plumbing for commercial, industrial, and/or institutional facilities. This role involves independently managing HVAC & plumbing design tasks, coordinating with multidisciplinary teams, and ensuring systems meet performance, energy efficiency, code, and client requirements. This position will be full-time in-house position in East Granby, CT. Key Responsibilities: Design HVAC systems including heating, cooling, ventilation, and control systems for new construction and retrofit projects. • Perform load calculations (heating and cooling), equipment sizing, and system selection. • Develop and review HVAC layouts, ductwork, piping, and equipment schedules using CAD/BIM tools. Develop and review plumbing layouts, sanitary & waste, venting, and domestic water. Prepare construction documents, specifications, and design narratives for our estimating team to prepare a proposal for the account manager. • Ensure designs comply with applicable codes and standards (e.g., ASHRAE, IMC, NEC, local building codes). • Coordinate HVAC designs with architectural, structural, electrical, plumbing, and fire protection disciplines. • Review shop drawings, submittals, and RFIs during construction. • Support commissioning activities and assist with field inspections and troubleshooting. • Evaluate system performance, energy efficiency, and life-cycle costs. • Mentor entry-level engineers and contribute to technical reviews. Required Qualifications: Bachelor’s degree in Mechanical Engineering or related field. • 3–7 years of HVAC engineering experience. • Proficiency with HVAC design software and tools (e.g., AutoCAD, Revit, HVAC load calculation software). • Strong understanding of thermal systems, fluid mechanics, and psychometrics. • Experience designing HVAC & plumbing systems for commercial or industrial buildings. • Ability to interpret and apply building codes and engineering standards. • Strong analytical, organizational, and communication skills. Preferred Qualifications: Experience with energy modeling or sustainable design (LEED, high-performance buildings). • Knowledge of building automation and control systems. • Working knowledge of ASHRAE standards and energy codes. • Engineer-in-Training (EIT) or Professional Engineer (PE) license. • Experience with healthcare, laboratory, data center, or mission-critical facilities. Benefits: Medical/Dental/Vision Insurance. 401(K) with Employer Match Contributions. PTO. Paid Holidays. Long-term Disability. Short-term Disability. Accidental Insurance. Hospital Indemnity Insurance. Critical Illness Insurance. Pet Insurance . Multiple Annual Employee Appreciation Events and more. U