About Us

To reduce, as much as possible, the consumption of finite energy resources



We will help our clients cut energy consumption by:

• Eliminating waste,

• Improving efficiencies, and

• Guiding them toward a sustainable energy future.

As a result, our clients will:

• Reduce operational expenses, enabling reinvestment in
  people,  product, and profits.


• Reduce their environmental impacts, to sustain life and


• Achieve control over energy use and costs, providing greater
  certainty and security for planning, budgeting and investing.


Practical Energy Solutions is a fast-growing, independent, local energy consulting firm with multiple partnerships, contract employees, and technical resources at the ready.

Our core office-based team members are always there for you. Pictured here at our headquarters in West Chester, PA, are (l to r): Bob McGreevy, President of EFfectiv Energy Solutions and Chief HVAC Design Consultant to Practical Energy Solutions; Paul Spiegel, President of Practical Energy Solutions; Dianne Herrin, Director of Energy Programs; Ben Pressman, Senior Engineer; Laura Gift, Office and Data Manager; and Lindsey Walaski, Project Engineer.


As founder and President of Practical Energy Solutions, Paul is a visionary who believes in the power of people to make a difference. Paul has the unusual gift of having equally outstanding analytical and verbal skills, which he puts to good use ensuring that our clients get real, honest value when they do business with us. Paul is particularly well-known for developing creative solutions to even the most challenging problems.

Paul has extensive expertise in energy auditing, strategic energy planning, rate analyses, capital investment analyses, energy education/panel presentations, and building construction. Prior to founding Practical Energy Solutions, he was principal or project manager for numerous large-scale commercial projects – including Lincoln Financial Field, Kimmel Center, Philadelphia Airport Terminal A, and Wachovia Center, just to name a few.

Paul's commitment also extends to the broader community. He is a Senior Member of the Association of Energy Engineers, a Business Associate Member of the Pennsylvania Association of School Business Officials (PASBO), a board member of The Sustainable Business Network Philadelphia Chapter, and a member of the Delaware Valley Green Building Council, Greater Philadelphia Chamber of Commerce and the Smart Energy Initiative. He has also served his community as a participant in the ASTM Building Energy Performance Disclosure Task Force and is past-Chairman of the West Goshen Planning Commission.

Paul Spiegel, P.E., LEED AP


Dianne brings to PES a strong personal commitment to a sustainable energy future. She combines her technical communications expertise, analytical capabilities, and strategic planning skills to help our clients see a clean, viable and positive energy path forward.

Dianne has 9 years of experience in the energy field, prior to which she spent 10 years managing her technical research and communications business. She is founder/past-Chair of West Chester Borough’s nationally recognized BLUER Committee (http://www.west-chester.com/221/BLUER). As President of Moms for the Future, Dianne championed the successful effort to convert school buses in 5 Chester County districts to a B20 biodiesel blend. She also received the 2nd annual Chester County Citizens for Climate Protection Gene Wilson Award for her community-based energy reduction and climate mitigation work.

Dianne serves on the boards of the West Chester Area Education Foundation and the Pennsylvania Green and Healthy Schools Partnership. She served on the Climate and Energy Policy Transition Team for Philadelphia Mayor Jim Kenney and is a member of the West Chester Borough Shade Tree Commission. She has training and experience with LEED Operations + Maintenance, carbon accounting/reporting, municipal energy planning and HVAC project bidding/management, energy master planning, energy auditing and climate policy.

Dianne Herrin, LEED AP - O+M

Director of Energy Programs

Bob has over 35 years of experience in HVAC/mechanical system evaluation and design. As President of EffectivEnergy Solutions, Bob resides with his own engineering team in the PES offices and partners with us on many HVAC projects.


He brings to PES years of deep, hands-on design expertise with all types of HVAC systems. He has worked for municipalities, schools, hospitals, and commercial building owners on design projects for central cogeneration plants, heat recovery systems, centrifugal magnetic chillers, geothermal systems, and much more.


Bob is incredibly creative and pays close attention to reducing energy use as well as cutting maintenance needs and costs, minimizing noise levels, reducing HVAC space requirements, and ensuring indoor quality. Most recently, he has championed his own "enhanced geothermal" concept, which combines the latest air filtration technologies with energy-efficient geothermal designs that work synergistically to significantly reduce sizing requirements while producing excellent indoor air quality. The end result is a highly efficient design that offers a financially superior option to conventional systems. 


Bob is a licensed professional engineer, a Certified Energy Manager, and a Notre Dame mechanical engineering graduate. He served as ASHRAE's Regional Vice Chair for research and is a senior member of numerous organizations - including the American Society of Hospital Engineers and the Association of Energy Engineers.



Robert McGreevy, P.E.

Senior HVAC Engineer