About Us

Lia Douillet

Lia has 1.5 years of experience as a HERS rater and is also certified as a Passive House verifier. Lia holds a B.S. in Building & Construction Technology and an M.S. in Sustainable Building Systems from UMass Amherst.

Xena Dreyfuss

Xena got their start in building science as an Energy Auditor for Community Action Pioneer Valley and completed their HERS Rater certification shortly after joining Airtight Energy Consulting in 2024. With a background in house remodeling and solar PV installation, Xena helps clients meet their home performance goals.  Xena is a certified BPI Quality Control Inspector and has a B.S. in Art Therapy from Lesley University.  

Mark Newey

Mark has nearly 25 years experience working to make buildings more energy efficient, including 17 years at the Center for EcoTechnology (CET). He holds certifications as a HERS Rater, Certified Passive House Consultant (CPHC), Passive House Rater and Verifier, LEED AP Homes, and LEED Green Rater. Mark holds a B.S. in Aerospace Engineering from Penn State University, and has a minor in Engineering Leadership Development.

John Saveson

John has over 15 years experience in energy efficiency consulting, including 12 years as a HERS Rater.  Prior to that, he worked in Architectural design and Landscape Architecture, with an emphasis on sustainability.  John is a certified HERS Rater, PHIUS Verifier, and BPI (Building Performance Institute) Building Analyst.  He holds a B.S. in Architectural Design from M.I.T.  and an M.A. in Landscape Design from the Conway School of Landscape Design.  

Matt Zarotny

Matt has over 12 years of energy efficiency consulting experience, including over 10 years as a HERS Rater at the Center for EcoTechnology (CET).  He holds certifications as a Home Energy Rater, Passive House verifier, and a Building Analyst with the Building Performance Institute. Matt holds a Masters in Management from Colorado Technical University and a BS in Geography from UMass Amherst.