Job Description

Senior Residential Mechanical Designer

Company Name: PEG, LLC

Location: Fairfax, VA

Project Focus: Residential HVAC Design, Energy Efficiency, High-Performance Homes, Home Energy Ratings, Green Building, Construction Compliance

Work Setting: Full-Time | Hybrid Remote/Office

Recruited By: Luxus

Position Overview

This is an opportunity for an experienced residential HVAC professional to take on a senior technical role focused on residential mechanical design, energy efficiency, code compliance, and high-performance building practices with PEG, LLC.

As a Senior Residential Mechanical Designer, you will serve as a senior technical resource for residential HVAC design and analysis, taking ownership of load calculations, duct sizing, equipment selection, QA/QC, energy modeling, project coordination, and technical problem-solving. You will also help improve internal processes and mentor junior and mid-level team members.

PEG has nearly three decades of experience delivering energy efficiency, engineering, environmental, and management consulting services and has provided Home Energy Ratings for more than 300,000 homes. This role provides the opportunity to contribute directly to PEG’s mission of improving building energy efficiency and the quality and performance of residential construction.

The position is based in Fairfax, VA, with the option for a hybrid remote/office work schedule.

Core Responsibilities

• Lead the preparation, review, and validation of residential HVAC load calculations, duct sizing, ventilation strategies, and equipment sizing in accordance with ACCA standards and applicable energy codes.
• Serve as a senior technical resource for residential mechanical design and analysis teams.
• Perform advanced QA/QC reviews of residential mechanical designs and energy modeling deliverables.
• Identify design, compliance, and workflow issues and communicate recommendations and resolution strategies to management.
• Manage complex project scopes, deliverables, milestones, priorities, and timelines.
• Develop technical solutions and process improvements that maintain project quality and schedule.
• Coordinate mechanical design requirements with internal departments, clients, builders, architects, subcontractors, and other project stakeholders.
• Interpret client requirements, jurisdictional constraints, energy codes, and project-specific design considerations.
• Utilize residential HVAC and energy modeling platforms including Manual J software, AutoCAD, WrightSoft/Wrightdraw, RESCheck, and REM/Rate.
• Maintain accurate project documentation, calculations, reports, and records using Excel, SharePoint, and internal systems.
• Interface with operations, owners, builders, and subcontractors to resolve technical issues and communicate project impacts.
• Maintain advanced knowledge of IECC requirements, state energy codes, and residential mechanical design standards.
• Support the development of internal best practices, templates, workflows, and process improvements.
• Train and mentor junior and mid-level team members on technical procedures, software, code compliance, and company standards.
• Assist with onboarding and technical development initiatives for new employees.
• Participate in continuing education, certifications, and professional development related to residential HVAC design, energy efficiency, and green building practices.

Required Qualifications

• Bachelor's Degree in Mechanical Engineering or a related field.
• Minimum 3+ years of relevant residential mechanical/HVAC design experience.
• Advanced proficiency in AutoCAD.
• Advanced experience with HVAC load calculations.
• Advanced proficiency with WrightSoft or similar residential HVAC design software.
• Strong understanding of ACCA Manual J, Manual D, and Manual S methodologies.
• Strong working knowledge of IECC requirements, ENERGY STAR®, and state residential energy codes.
• Strong analytical and problem-solving abilities.
• Excellent attention to detail and accuracy.
• Ability to manage multiple projects, deadlines, and priorities simultaneously.
• Strong written and verbal communication skills.
• Ability to work independently while contributing to team development.
• Ability to effectively collaborate with builders, architects, clients, subcontractors, and internal teams.
• Comfort with the Fairfax, VA office location and hybrid remote/office schedule.

Preferred Qualifications

• Engineer in Training (EIT) designation.
• Experience with green building programs and high-performance residential construction.
• Experience with residential energy modeling and construction compliance.
• Experience with Manual J, Manual D, and Manual S beyond basic application.
• Experience mentoring or training junior and mid-level technical staff.
• Experience developing technical standards, templates, workflows, or process improvements.
• Advanced proficiency in Excel and SharePoint.
• Experience working with emerging residential HVAC design and energy efficiency technologies.

EIT Incentive: PEG offers a salary incentive for professionals who obtain their EIT designation.

Compensation & Benefits

PEG offers a comprehensive total rewards package designed to support employee growth, flexibility, and long-term career development.

Benefits include:

• 20 annual paid days off, including PTO, birthday PTO, and company-paid holidays
• Company-sponsored medical insurance with a contribution of up to 50% of the monthly premium
• Dental and vision insurance
• 401(k) retirement plan with up to a 4% company match, vested immediately
• Basic and supplemental life insurance
• Short-term and long-term disability coverage
• Accident and pet insurance
• Corporate-sponsored events
• Paid professional development
• Salary incentives through learning and certification opportunities

About PEG, LLC

PEG, LLC is a diverse energy efficiency, engineering, environmental, and management consulting firm with nearly three decades of experience serving clients throughout the Eastern and Central United States.

PEG partners with many of the nation's leading homebuilders to deliver construction compliance services and has established itself as a leader in Home Energy Ratings and energy-efficient residential construction. With more than 300,000 homes rated, PEG combines technical expertise, data-driven solutions, and sustainable building practices to improve energy efficiency and long-term building performance.

The company focuses on innovative solutions that support high-performance buildings, sustainable development, client success, and better quality of life in the communities it serves.

About Luxus | AEC Talent Partners

Luxus is an AEC recruiting firm connecting experienced architecture, engineering, and construction professionals with organizations building the future of the industry.

We partner with firms across the AEC sector to identify technical professionals whose experience, leadership, and career goals align with opportunities that may not be widely advertised.

Not the right fit for this role? We still want to hear from you. Our network continues to expand with opportunities across architecture, engineering, building systems, and related disciplines.

Keywords

Senior Residential Mechanical Designer, Residential Mechanical Design, Residential HVAC Design, HVAC Engineering, Mechanical Engineering, Residential MEP, HVAC Load Calculations, Manual J, Manual D, Manual S, ACCA, WrightSoft, Wrightdraw, AutoCAD, RESCheck, REM/Rate, Energy Modeling, Energy Efficiency, IECC, ENERGY STAR, Green Building, High-Performance Buildings, Residential Construction, Home Energy Ratings, QA/QC, Mechanical Design, HVAC Design, Fairfax VA, Virginia