Residential Mechanical Designer

Design - Residential · Fairfax, Virginia
Department Design - Residential
Employment Type Full-Time
Minimum Experience Experienced
Compensation $55K - $65K


PEG, LLC is in its twenty-fifth year being a diverse energy efficiency, engineering, environmental and management consulting firm operating principally in the Eastern and Central United States.

As a leader in Home Energy Ratings, a winner of multiple Energy Star Awards, and a standout in the construction industry, PEG has provided Home Energy Ratings for over 170,000 homes. We strive to continually improve building energy efficiency and therefore, the quality of homes and life in the communities that we service.

Please visit our website at to learn more about PEG! 



Residential Mechanical Designers at PEG will have the opportunity to perform load calculations and design residential HVAC systems using the industry’s leading modeling software.  PEG specializes in green building and design which we incorporate in each project.  This position focuses on furthering professional career development through training and certifications. We are looking for someone self-motivated, detailed oriented, and hardworking to add to our dynamic team.


Job Location:

This position is based in our main office in Fairfax, VA with the option of a hybrid remote/office work schedule after the completion of the employee's 90 Day Performance Review.

Essential Functions:

  • Perform and review HVAC load calculations, duct sizing, and system sizing per ACCA Standards
  • Provide support to analysis team
  • Communicate any auditing areas to Management and provide options for resolution
  • Organize scope into major categories to outline deliverables and milestones
  • Determine primary timetable for deliverables
  • Modify critical paths based on prevailing conditions
  • Develop workarounds to overcome obstacles in the critical path
  • Integrate, review, and validate critical relationships with primary parties
  • Receive and understand client constraints
  • Able to modify and adjust to software – Manual J Software, AutoCAD, Wrightsoft-Wrightdraw, RESCheck, REMrate
  • Manage and control all data through Excel and SharePoint
  • Interface with Operations, Owners, and Subcontractors to discuss impact of work and resolution of problems.
  • Understand current IECC and state codes for Residential Design


  • B.S. Degree in Mechanical Engineering or relevant field is required with a GPA of 3.0 or above.
    • Relevant coursework includes but is not limited to the following: Thermodynamics, Fluids, HVAC, Material Science, and Circuits.
  • EIT is NOT required but salary incentive will be offered to those who obtain it.
  • Candidate must have 2 years+ of relevant experience in Residential Mechanical (HVAC) Design
  • 2 yrs + of AutoCAD experience is a must.
  • 2 yrs + of Load Calculations experience is a must with experience in WrightSoft or a similar software preferred

Additional Requirements:

  • Advanced Proficiency in Excel/SharePoint
  • Strong Attention to Detail
  • Deadline-Oriented
  • Efficient Time Management Skills
  • Effective Interpersonal Skills
  • Excellent Verbal/Written Communication Skills
  • Ability to read/write/comprehend technical instructions

Rewards and Benefits

PEG LLC offers a comprehensive, total rewards package that includes competitive compensation and a flexible benefits package that reflects our commitment to creating a diverse and supportive workplace.

Benefits include: • 20 Annual Paid Days Off (12 Days of PTO, Birthday PTO, & 7 Company Paid Holidays) • Company Sponsored Medical Insurance that includes a contribution of up to 50% off the monthly premium • Dental & Vision Insurance • 401(k) Retirement Plan with up to a 4% company match vested immediately • Basic Life & Supplemental Life • Short-Term & Long-Term Disability • Accident & Pet Insurance • Corporate Sponsored Events • Paid Professional Development & Salary Incentives through Learning/Certification Opportunities •

PEG LLC is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, national origin, ancestry, citizenship status, military status, protected veteran status, religion, creed, physical or mental disability, medical condition, marital status, sex, sexual orientation, gender, gender identity or expression, age, genetic information, or any other basis protected by law, ordinance, or regulation.

Thank You

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  • Location
    Fairfax, Virginia
  • Department
    Design - Residential
  • Employment Type
  • Minimum Experience
  • Compensation
    $55K - $65K