Who We Are

CoolSys Energy Design, formerly known as Energy Squared (E2), is a consulting engineering firm providing single-source MEPR (mechanical, electrical, plumbing and refrigeration) engineering analysis and design for both new construction and existing building remodels. In addition, CoolSys Energy Design offers building performance modeling and energy simulations as well as feasibility studies for sustainable and energy-efficient facility energy systems.

What We Do

Our firm has a passion for innovative engineering solutions that integrate leading edge, sustainable technologies and systems. Our broad range of engineering expertise and technological sophistication delivers cost-effective and environmentally intelligent building performance:

  • Mechanical, electrical, plumbing, refrigeration and fire safety design
  • Energy audits/energy spend analysis
  • Building energy modeling and simulation
  • Real-time building and equipment energy performance monitoring
  • LEED building engineering expertise
  • Commissioning/retro-commissioning
  • Renewable energy strategies
  • Control systems/building automation
  • Utility rebate and government incentive management
  • Turnkey project management


Our firm’s dynamic record of success is grounded in 35 years of designing MEPR systems for all types of buildings worldwide, including commercial, industrial, retail, hospitality/entertainment/leisure, mixed use and multi-family residential facilities.

CoolSys Energy Design is headquartered in Princeton NJ, with offices in San Antonio, TX and Fullerton, CA.


CoolSys Energy Design works collaboratively with building owners, architects, facility professionals and property management companies to analyze and design new and existing building MEPR system engineering solutions across the country.

Nationwide Coverage Map

New Jersey Office – HQ
5 Independence Way, Suite 360
Princeton, NJ 08540
Phone: 609.751.9655
Fax: 609.751.9658

Texas Office 
7330 San Pedro, Suite 402
San Antonio, TX 78216
Phone: 210.510.2300
Fax: 210.510.2319

Fullerton Office 
4275 N. Palm St., Suite 100
Fullerton, CA 92835
Phone: 714.578.2300
Fax: 714.578.4035

Meet The Team


Our CoolSys Energy Design Princeton headquarters team draws on the deep expertise of 80 professional engineers, designers, licensed inspectors and sustainable design and energy professionals. Our highly talented staff includes licensed Professional Engineers (PE), U.S. Green Building Council Leadership in Energy and Environmental Design Accredited Professionals (LEED APs), Association of Energy Engineers Certified Energy Managers (CEMs), National Association of Home Builders Certified Green Professionals (CGPs) and Building Performance Institute Professionals (BPIs).



For over 35 years Allan Samuels, former Founder and Managing Partner of Energy Squared and newly integrated President of CoolSys Energy Design, has distinguished himself as an expert in supermarket engineering. His passion for energy efficiency, sustainability and energy conservation has made CoolSys Energy Design/Energy Squared the “go-to” firm for grocery stores, distribution centers and mixed-use store design. A graduate of Oxford Polytechnic in England, Allan’s particular specialty, energy-efficient lighting systems, is only a piece of where the CoolSys Energy Design team can add value to the MEPR (mechanical, electrical, plumbing and refrigeration) design.

With a focus on building systems life-cycle cost analysis, Allan’s expertise in the comparative advantages of different lighting systems has saved clients thousands of dollars through innovative design. Winner of the prestigious Philips Lighting Design Award, Allan is currently rated a US Green Building Council LEED AP (Leadership in Environmental and Energy Design Accredited Professional) and is a past chapter President of the NFPA (National Fire Protection Association). Allan is particularly proud of his award from the SmartCEO Organization at their Future 50 Fastest Growing Companies in New Jersey and he looks forward to continuing this growth trajectory as part of the CoolSys team.




With over 40 years of domestic and international facility engineering experience, Clive is a recognized leader in many aspects of building engineering and design, with a specific emphasis and passion in the design and development of optimized HVAC, refrigeration and building automation systems for commercial industrial and perishable food distribution facilities throughout the US as well as the UK, Europe, Asia and Australia.

Clive, who holds advanced degrees in Mechanical Engineering from The University Of The Witwatersrand in Johannesburg, South Africa with Majors in Thermodynamics and Heat Transfer, is a renowned specialist in building performance and facility energy consumption optimization.

He is an engaging speaker, recently presenting lectures on optimized HVAC design efficiency for food stores and perishable food distribution centers and the effect of humidity control on energy consumption, at the 2015 Food Marketing Institute National Energy Conference, and for ASHRAE (American Society of Heating, Ventilation and Air Conditioning Engineers) of which he is a lifetime member.

Clive is a Licensed Professional Engineer currently registered in 26 states.




Chris has over 15 years experience in construction management, and offers a wealth of knowledge and experience in resolving on-site construction problems and issues. Chris has a unique capability of uncovering solutions to complex MEPR construction related issues. Chris has many years of involvement with plumbing design, bidding, cost estimating and commissioning which has been an invaluable addition to CoolSys Energy Design services, particularly with cold storage distribution facilities, supermarkets and big box retailers/wholesalers.

A graduate of the University of Delaware, Chris has spent two decades focusing on sustainability and energy efficiency. He is an active member of the ASPE (American Society of Plumbing Engineers) and the NFPA (National Fire Protection Association).




Ben Rosenzweig is the Vice President of Operations for CoolSys Energy Design. He has 10 years of industry experience, and oversees the operations of a team of design and engineering professionals who support the engineering needs of customers in diverse markets nationwide. With a Master’s degree from Lehigh University, Ben is skilled in operations management, engineering design, energy analysis, and business development. He has a passion for client service and solving unique and complex problems. Ben is a Licensed Professional Engineer in many states with specific expertise in Mechanical and Refrigeration systems.




Briana Walsh has a passion for people, which is why she serves as the Vice President at CoolSys Energy Design. After transitioning from the non-profit sector in human services, she brought with her the mind-set to put “people-first” which is perfectly in line with the CoolSys mantra. Briana has a Master’s in Business Communication and BA in Journalism and Public Relations from Rider University; and she utilizes the theories of her thesis, “How Employee Engagement Equals Company Profitability” on a daily basis by motivating her team. With a role split between Sales, Marketing, and Human Resources, Briana can be found cultivating new relationships with both clients and candidates alike and would love to connect with you about a future project or career opportunity within the CoolSys team.


Yoram Perelman


Yoram Perelman has over 25 years of experience in electrical engineering in a multitude of sectors including commercial, industrial and retail building design. With a bachelor’s degree in Electrical Engineering from Fairleigh Dickinson University, Yoram has honed his competencies in many electrical facets such as power distribution, stand-by generation system design and building integration, lighting systems design, low-voltage systems and short circuit study and coordination. Of all the things in which he excels, Yoram’s passion is the development of conceptual engineering for new construction projects that provide the basis for an energy-efficient, coordinated design. In fact, Yoram was the lead electrical engineer and project manager of the first Silver LEED certified supermarket in the US (pilot program) where he applied energy conservation strategies and incorporated technology to reduce the energy footprint of the project. During his tenure at CSA (Clive Samuels and Associates), Yoram quickly advanced into a Senior Project Management role due to his ability to handle large-scale national accounts. Yoram takes pride in his ability to personify the CoolSys Energy Design/Energy Squared mantra for innovative solutions, on-time delivery and meeting our client’s construction and expansion design needs.


Thursten Simonsen, PE, LEED AP


Thursten Simonsen brings over 21 years of experience in various roles, including owner’s design and construction representative, consulting engineer, project manager, and business development manager. Thursten received his B.S. in Mechanical Engineering from The University of Texas at Austin, and his MBA from The University of Texas at San Antonio. He is also a LEED AP O&M with USGBC, a Certified Energy Auditor with AEE, and an ASHRAE High Performance Building Design Professional. Thursten volunteers regularly at his childrens’ schools, with ASHRAE, and in local community organizations where he recently chaired a City of San Antonio committee on the environment and sustainability, and serves as an executive officer with the UTSA Alumni Association – EMBA Chapter. He looks forward to being an integral part of the team in San Antonio, and fostering continued growth.