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About PSD

Who We Are

PSD is an energy efficiency services and software company. We combine building science with technology to help our customers achieve tangible energy efficiency improvements. Our founder Greg Thomas started PSD in Ithaca, NY in 1992. Since then, we have implemented over 20 energy efficiency programs and provide software to users in almost all 50 states.

PSD will help you do the most important work of your life.

Kathy GreelyCEO

We build products and deliver services that support energy efficiency improvements in buildings. For over 25 years, PSD employees have been innovating and evolving the energy efficiency industry. We bring technical experts together with hands-on implementers to create the services that deliver and software that accurately and efficiently measures the outcomes of your programs.

We understand that through innovation you will achieve better program results.

Emelie Cuppernell GlitchVP Program Services

Adapting to climate change is the challenge of our lifetime. It’s going to take innovation akin to the industrial revolution and space race to meet the challenges that the environment faces. We believe building science technology has a critical role to play in decarbonization.

It is clear, applied technology will expedite decarbonization.

Greg ThomasCSTO

Easily at the top of the list for us are the programs run by PSD. Their commitment to full support of the program stakeholders through their intuitive Compass interface, live support, solicitation of constant feedback, quality training, and education make them a professional pleasure to work with.

HERS Rater

We have worked with PSD in the FirstEnergy New Homes program in Pennsylvania for the past couple of years. It is so refreshing to work with an organization that is easy to work with, supportive and quick to respond to any questions we have. PSD’s process of registering and applying for rebates is such an easy process. Thank you for making this so user friendly!

Energy Contractor

I love to work with PSD on above code and energy efficiency programs.  There software is easy to understand and convenient to use.  There technical help is both knowledgeable and timely, I just send them an email and I usually hear back within an hour.  They make it easy for me to help my customers maximize their participation in the programs.

HERS Rater

I just wanted to thank you for the feedback, and for the quality of the QA report. Because of the many rebate programs in which we operate, we get a lot of QA done by the implementers of utility funded programs. This is by far the most professional QA report I have received from an incentive program.

Energy Contractor

Join Our Team

Join our team to change how people and buildings use energy.

Lauren McFeeley - April 2024 Employee Spotlight
Employee Spotlight

Lauren McFeeley – QA Manager

This month’s Employee Spotlight is… Lauren McFeeley – QA Manager 1. Where did you grow…
Employee Spotlight

Ashley Zottola – HR Generalist

This month's Employee Spotlight is… Ashley Zottola – HR Generalist   1. Where did you…
David Tan – Senior UI/UX Designer
Employee Spotlight

David Tan – Senior UI/UX Designer

This month's Employee Spotlight is… David Tan – Senior UI/UX Designer   1. Where did…
Adam Smith – Energy Codes Specialist
Employee Spotlight

Adam Smith – Energy Codes Specialist

This month's Employee Spotlight is… Adam Smith – Energy Codes Specialist 1. Where did you…

Energy Programs

Designing and implementing cost-effective performance-based energy efficiency programs.

Program QA

Leading provider of QA services supporting energy efficiency programs throughout the country.


PSD Compass is a configurable enterprise solution for energy efficiency programs and implementers.


Technology for large-scale electrification, Heat Pump + Retrofit Toolkit, standardized simulations and tools.

Energy Codes

Expert technical leadership achieving decarbonization, cost-effectiveness, resilience, and equity goals.

HERS Provider

Accredited Home Energy Rating Provider, offering nationwide technical support and services.


Moving the industry forward with PSD’s intimate knowledge of how buildings work.


Join our growing team of energy efficiency professionals to help us save energy to save the planet.