Who We Are

CoolSys Energy Design, formerly Energy Squared, is a consulting engineering firm providing single-source MEPR/FP (mechanical, electrical, plumbing, refrigeration, building controls, and fire protection) engineering design and analysis for both new construction and existing building remodels. In addition, CoolSys Energy Design offers building energy and emissions modeling as well as renewable system feasibility studies with a sharp focus on sustainability and decarbonization.

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 (HVAC) engineering including air-based and hydronic systems, central plants, and decarbonized heat pump systems
  • Electrical engineering including building power distribution, lighting, emergency generators, distributed generation, solar photovoltaics (PV), and battery energy storage systems (BESS)
  • Plumbing engineering including domestic hot and cold water systems, natural gas, sustainable water collection systems, sanitary drainage, grease waste, roof drainage, and more
  • Refrigeration engineering for commercial and industrial applications including the latest in low-GWP and natural refrigerant systems like transcritical CO2, micro-distributed systems, and A2L refrigerants
  • Building Controls engineering including full building automation system (BAS) design
  • Fire Protection engineering including fire sprinkler and fire alarm systems for NFPA 13-based and special hazard systems
  • Energy and emissions modeling
  • Full building electrification
  • LEED and WELL building expertise
  • Renewable systems and strategies
  • Utility rebate and incentive application and management
  • Project management


Our firm’s dynamic record of success is grounded in over 40 years of designing MEPR/FP 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/FP system engineering solutions across the country.

Nationwide Coverage Map

New Jersey Office – HQ
4 Independence Way, Suite 401
Princeton, NJ 08540
Phone: 609.751.9655
Fax: 609.751.9658

Texas Office 
7330 San Pedro, Suite 910
San Antonio, TX 78216
Phone: 210.510.2300
Fax: 210.510.2319

California 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 team draws on the deep expertise of over 100 professional engineers, designers, 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) all with a passion for delivering innovative, sustainable, lower carbon output designs for all of our clients.



Ben Rosenzweig brings his broad experience with the commercial, industrial, and large-scale residential markets to CoolSys Energy Design to lead the company, projects, and clients towards a more sustainable, lower carbon emissions, and more energy-efficient future every day. Starting his career at ExxonMobil prior to joining Energy Squared, which then became CoolSys Energy Design, he has worked his way into the company’s leadership role and brings many years of wide-ranging experience with him. Ben focuses on creating an environment where his passion for innovation, creativity, and entrepreneurialism drive both the success of the engineers and designers working for the company as well as the projects that our clients trust us to develop.

Ben is a graduate of the College of Mechanical Engineering and Mechanics at Lehigh University with both a bachelor’s and master’s degree in Mechanical Engineering. He is also a licensed Professional Engineer throughout the United 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).


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.


Shane Best, PE


Shane Best is a Director for CoolSys Energy Design with over 25 years of industry experience. He oversees the operations of a team of design and engineering professionals who support the engineering needs of customers in diverse markets nationwide. He has a strong business acumen. He is adept at motivating business teams to get results and leveraging relationship building, empowering employees to increase revenue and optimize business.

Shane is a Licenced Professional Engineer with an Electrical Engineering degree from Texas A&M University and a master’s in business from Southern Methodist University. He has a Commissioning Authority certification from the Association of Energy Engineers.

He has served on several non-profit and civic boards and has acquired his Advanced Toastmasters Certification, having founded a local organization in North Texas. He has been a member of IEEE since 1997, when he was the Branch Chapter Founder and Chairman of the Power Electronics and Engineering Association of IEEE at Texas A&M.


Paul Kim

Paul Kim


Paul Kim is the Director for CoolSys Energy Design responsible for the California office’s operations.  He has over 17 years of industry experience that he brings to the table on each and every project he is involved in.  From starting as an engineering estimator at the beginning of his career, Paul has been close to and involved in the MEPR-built environment for the majority of his working life.

Paul is a motivating and enthusiastic leader who puts his people first and always ensures that client’s needs are met.




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 for the design and development of optimized HVAC, refrigeration, and building automation systems for commercial and industrial facilities around the world. After serving as a founder and president of the business for over 40 years, Clive now serves as a key technical advisor to CoolSys Energy Design.




For over 40 years, Allan Samuels was the founder, managing partner, and president of CoolSys Energy Design, formerly Energy Squared. He is a distinguished expert in the supermarket and multifamily building engineering industries. His passion for energy optimization, sustainability, and solving tough challenges helped make CoolSys Energy Design the “go-to” firm that it is today. Allan now serves as a key technical advisor to the business.