Student Ratings

by Donovan Netherland, Managing Member, Tread Light Construction 12/22/2019

If you would like to thoroughly understand and internalize the process and knowledge required to tackle the complexities of creating Deep Energy Retrofits, take this course! Marc knows his stuff!

by Roger Gutzwiller, Owner, Acquire 01/10/2019

Marc Rosenbaum uses his in-depth knowledge and experience in Deep Energy Retrofits to present a wealth of information in a manner that is easy to digest. Anyone interested in making a home or building more livable and energy efficient should benefit greatly from this course.

by Nathan Fournier, CEO, Property Providers, LLC 01/08/2019

This course was an efficient and practical way to learn the ins and outs of how to conduct a deep energy retrofit on a building. The world be a much better place if every contractor and builder learned and applied the material in this course!

by michael champagne, Mr. 05/02/2018

much to get out of marc's course on deep energy retrofit. looking forward to applying the knowledge to add one more der home.

by Gary Friend, Owner, Friends Home conservation Service LLC 04/04/2018

This course will help in everyday analysis of building envelopes when it comes to new construction and in retro work. I believe it clears up or verifies preconception of how a structure leaks and retains heat. Specific attention is always on health and safety and moisture cause and effect.

by Joseph Williamson 01/18/2018

I thoroughly enjoyed the course. It is very helpful to find different ways to improve energy efficiency, especially when you work in the industry. I was engaged throughout the course and finished within a short time.

by Craig D 12/17/2017

by Carl Burns, Architect, Carl Burns Architect 08/29/2017

The course is terrific. Marc Rosenbaum brings great energy, affection and experience to the subject. He combines a focus on fundamental physics and materials and methods concerns. The exercises and reading are interesting and helpful. - C. Burns 8/29/17

by Kelly O'Connell, Project Engineer, ERS 05/05/2017

I really enjoyed this course! It is a great introduction to building science and residential construction techniques, with the focus being on energy reduction and savings. Marc speaks clearly and doesn't not delve too deeply into technical details or calculations, which allows for a well-established understanding of the topics at a high level.

by Juana Gomez, Principal, Lawrence and Gomez Architects 12/11/2016

This class provides the opportunity to study the subject matter at many levels, whether as a review, an introductory class, or for deeper understanding of particular topics.

by Tom Davidson, Senior Mechanical Engineer, DLB Associates 01/20/2016

Marc Rosenbaum has always taught top-notch courses with a unique mix of expertise, humor and humanity. His new Deep Energy Retrofits course was no exception -- I highly recommend it.

by John Poole, Tradesman in Chief, Birmingham Point Preservationists 12/24/2015

Marc's approach to deep energy retrofits is technically astute, pragmatic, and replete with a broad range of real world case studies. I completed this course understanding far more about DERs than I'd ever imagined.

by Joseph LaRusso, owner 1 old house 12/18/2015

This is the second course that I've taken with Marc (I'd taken his Zero Net Energy Homes course previously), and the superlative quality of Marc's instruction and assembled materials were entirely consistent with his ZNE course. I highly recommend Marc's courses.

by Laura Fitch, Principal, Kraus Fitch Architects 12/17/2015

This course is excellent. We need to make big changes to reduce energy demands in our changing world. Retrofitting existing homes is a really important part of that. This class will help building professionals do just that - the important work of our industry.

by Edward Bell, Principal, Lawson Bell Architects 12/17/2015

If you are interested in the future of energy conservation in the built environment, this is a great starting point.

by Dave Cornell, Architect/Contractor, The CORNELL Architectural Group pllc 12/13/2015

Let me come back to this...

by Reid Betz, Principal, Ageloff & Associates 12/09/2015

This is an excellent course for anyone interested in building or designing buildings with a high level of thermal and energy performance, particularly if you work in existing buildings. The instructor has a wealth of practical knowledge to share and the Heatspring team does a wonderful job supporting the course.

by Justin Tourigny, builder, NxE Building 12/06/2015

Anyone interested in obtain a good foundation in DER should start right here with Marc and HeatSpring.

by Peter Brooks, Owner, Brooks Architecture 12/01/2015

This is the second course of his that I have taken, that should tell you something. Marc is on the cutting edge of Net Zero and DER design. He covers all aspects that are needed for a complete design of the technical engineering aspects.

by Myrt Jaquay-Wilson, Estimator, Wright Builders, Inc 11/28/2015

Marc's wealth of knowledge and years of field experience create an unparalleled learning experience. Seldom does anyone so truly walk the walk they talk.

by Irving Yee, Architect, Ethelind Coblin Architect 11/28/2015

Marc is a true Master of doing Deep Energy Retrofits. His ability to breakdown concepts and deliver each topic in simple terms makes this course easy to understand. It is great for licensed professionals and contractors who want to expand their knowledge and businesses. It is also fun for ordinary folks who just like houses. It's for everyone who wants a low energy, super comfortable home.

by Joe Bosworth, CEO, Holyoke Design Center 11/19/2015

Only the comments above, for now. Thank you.

by James Bell, Associate Engineer, National Grid 11/18/2015

The Deep Energy Retrofit (DER) course was fun. This course helped me understand complex DER concepts in a comprehensive and understandable matter. Building science is awesome!

by Brian Roberts, Managing Partner, Landmark Services, Inc 11/18/2015

Feel free to use comment above if you'd like.

by Damian G 01/10/2022

by Derek D 05/26/2021

by Mila B 08/19/2020

by Jim K 08/17/2020

by Tanja P 07/08/2020

by Alejandra R 06/30/2020

by Anda T 04/30/2020

by Nina S 09/30/2019

by Zachary T 10/13/2017

by Tom D 10/11/2017

by David P 12/18/2016

by William S 01/17/2016

by Chris W 12/21/2015

by Mark P 12/18/2015

by Michele S 12/11/2015

by Meredith R 12/08/2015

by Kevin G 12/02/2015

by Tom B 11/23/2015

by Patrick M 11/20/2015