Responding to COVID-19 together

Responding to COVID-19 together

During these are unprecedented times we wanted to let you know what we are doing to respond to the outbreak.

To protect the health and wellbeing of our employees and their families, all EDSL staff are working remotely. However our support and consultancy services remain fully operational and contactable via email and phone.

As countries all over the world put restrictions in place and encourage people to use social distancing, many of our customers will also be working remotely. We have implemented the following policies to help you during these difficult times.


Remote Working and License Access

During these times of social distancing and remote working users may need additional flexibility. Should you need an alternative method for sharing a license or if you no longer have the same access to your license, please contact and we will be able to provide you with free temporary licenses.


New Roaming Network Licenses

We also have new roaming network licenses in Tas 9.5 which are ideal for remote working and sharing licenses between different locations.


Training and Education

As per current advice, all in person training is cancelled. To help with training new users in the mean time, we have made access to all of our e-training courses free. Please note that you will need to sign up to enrol on a course.



Our support staff are here to help as normal. Please get in touch via email for the quickest response at Also visit our support page and FAQ sections for alternative assistance.


Student Access

As always, access to Tas is free for Acadmic and Research purposes. Get in touch with info to register for an academic license.


New Users/Trials

For new trial requests and additional licenses please visit Buy Online for options or contact


By Phone

(212) 957-5415
9am - 5:30pm, Eastern Time

Our Address

1350 Avenue of the Americas, Fl 27
New York, NY 10019

New Release: Tas 9.5

EDSL Announce New Tas 9.5 Release!

64-bit Tas is finally here along with many productivity and automated task improvements.

Please find below a list of some of the new features:

64-bit application:

All Tas applications have been updated from 32-bit to 64-bit. Improvements to memory limitations allow for much bigger, more complex models.  Tas can now handle even more detailed daylight, thermal, and HVAC systems analysis.

Repetitive task automation:

  • Automated workflows to complete ASHRAE design day load sizing
  • Improved automation of ASHRAE 90.1 appendix G baselines (2007-2016)
  • Automation for LEED v2009 and v4 Minimum Energy Performance Calculator spreadsheet
  • Automated LEED daylight credit calculation v2009, v4, 4.1

Workflow/ interoperability

  • Create editable Tas 3D Modeller geometry from imported EnergyPlus and eQuest files. 
  • Run shading calculations from EnergyPlus data in Tas, utilizing our multi-core and peer-to-peer calculation options
  • Improvements to BIM-to-BEM and BEM-to-BEM interoperability for transdiciplinary teams/ workflows

User experience:

  • UI updates to modernise the look and feel, improve clarity/ legibility. 
  • Improve productivity further with fast simulation engine, 30 times faster than other industry tools
  • Improved navigation across tabular, graphical, and 3D data representations for easier exploration, troubleshooting, and QA/ QC

Expanded licensing:

New Network license option:
  • Easily share licenses between computers and offices
  • Lease licenses for guaranteed offline access or during travel
  • Flexible, short-term commitment monthly and cost effective annual subscriptions
  • Multi-seat:  Discounted license bundle for increased processing power 

To request a demo please contact us

Try Tas 9.5 today, new offers and licensing options available

2019 ASHRAE BPAC – Preconference Workshops

2019 ASHRAE BPAC - Preconference workshops

2019 ASHRAE Building Performance Analysis Conference - Preconference Workshops

Effective simulation throughout the building life cycle with Tas (presented by EDSL)

On Tuesday morning, we held a pre-conference workshop with attendees from high performance building design teams, firm leaders, energy analysts, and other related backgrounds.  Michael Sawford and Robert Yori reviewed how Tas can be used throughout the ASHRAE 209 cycles.  This included a general introduction to Tas, BIM and BEM interoperability workflows, and whole building simulation using Tas Systems – our component based tool for simulating innovative and advanced plant room and air-side systems. 
The workshop included live simulations of projects, systems inspection using Tas Systems, and a case study of a post occupancy performance analysis. To wrap up, attendees stayed for lunch and were joined by our afternoon workshop participants for some networking and knowledge sharing.  

Crafting your story with building performance simulation data (sponsored by EDSL)

The afternoon workshop was well attended with some last minute sign-ups taking the total to 23. 4 attendees from our morning workshop also joined us for the afternoon which turned out to be a great workshop led by Alejandra Menchaca (Thornton Tomasetti), Kjell Anderson (LMN Architects) and Aman Singhvi (AECOM).

2019 ASHRAE Building Performance Analysis Conference

2019 ASHRAE Building Performance Analysis Conference

2019 ASHRAE Building Performance Analysis Conference

EDSL were once again pleased to sponsor 2019’s ASHRAE BPAC event, which was held in Denver last month.   Many thanks to everyone who attended our workshops, stopped by our table, and took a few minutes to chat with us about Tas.  In comparison with last year’s ASHRAE/ IBPSA joint meeting, our conversations trended more toward Tas’ functionality and its capabilities, while last year we spent a lot of time introducing Tas to people.  It’s rewarding to see that Tas is increasingly recognized and being used in North America.

In addition to our outreach about Tas, EDSL was involved in a number of the program sessions throughout the week.  We proudly contributed to Amir Rezaei’s “Geometry Translation – the Good, the Bad, and The Ugly” session, offering our thoughts and experiences with BIM to BEM, what’s working, and what would be improved upon.  We were also given the opportunity to opine on the state of software and energy modeling in the Vendor Town Hall, where we touched on Tas’ robustness, speed, and accessibility.  
EDSL also continued our active participation through Project StaSIO’s third year and 2nd annual competition, helping to organize this year’s competition, manage the jury selection, and improve the website.  And we’re not finished yet – as a result of this year’s outstanding entries, we have some new ideas in store for next year’s competition.  So stay tuned!

BuildingEnergy NYC 2019

EDSL USA at BuildingEnergy NYC 2019

EDSL at NESEA’s BuildingEnergy NYC Conference + Trade Show in September, held in downtown Manhattan.
This was our second opportunity to be involved with NESEA, and we were glad to be involved once again in the community by sponsoring BuildingEnergy NYC.  Being in EDSL USA’s home city, it was the perfect opportunity to announce our Tas Workshops.  Throughout the week of October 21 we will be hosting a series of workshops that introduce Tas, including both general and deeper-dive sessions.

We hope that many of the BuildingEnergy NYC attendees will be able to join us along with other building performance analysts and educators in building science from in and around the New York area.  There are still some seats available, so register now if you’d like to join us.

2019 ASHRAE Building Performance Analysis Conference & Project StaSIO

2019 ASHRAE Building Performance Analysis Conference and Project StaSIO

After a tremendously successful first year of IBPSA-USA’s Project StaSIO, EDSL USA VP Michael Sawford is looking forward to expanding its reach and offering.  “Last September’s Building Performance Analysis Conference and SimBuild was the perfect opportunity to introduce Project StaSIO to the world, and the competition provided a great way to kick start the resource for the BEM community.

This year promises some exciting advancements – new leaders have joined, enabling the committee to expand its range and potential impact. Thanks in large part to the DOE, who funded the initiative, we are redeveloping our online presence, and refreshing the website to create an engaging, valuable, easy-to-use resource for inspiration and research. 

2019 ASHRAE Building Performance Analysis Conference - Pre-conference Workshops

In addition to our involvement on the StaSIO committee, EDSL is supporting the initiative and its goals in several other ways. At ASHRAE BPAC 2019, we are sponsoring the pre-conference course Crafting your story with building performance simulation data, led by experts from Thornton Tomasetti and LMN Architects.  We will also be running a pre-conference course entitled Effective simulation throughout the building life cycle with Tas”.  Both worships will take place on Tuesday, September 24.  

You can learn more and register here, spaces are limited so please register early: 

DOE BTO Peer Review 2019

US Department of Energy's Building Technologies Office BEM Peer Review 2019

Along with other industry leaders and stakeholders, EDSL’s Michael Sawford was invited as a reviewer for the DOE’s BTO BEM Peer Review. The review took place April 16th last month, where participants were asked to review and advise the current range of BTO projects with the goal of furthering research and the advancement of building simulation in the design, operations, and maintenance of buildings.

BTO's Request for Information

The Building Technologies Office has produced a request for information and provided all the necessary information on the EERE exchange website for the wider BEM community to get involved and participate. IBPSA-USA has also provided a useful survey for the community to get involved and respond to the RFI.
Responses to this RFI must be submitted electronically to no later than 5:00pm (ET) on June 3, 2019.
To participate follow the links below:
  • DOE Resources:
  • IBPSA-USA resources for participating:

Tas two-way link to EnergyPlus

See the About Tas page to learn more about how we are working on improved flexibility and interoperability with Tas and EnergyPlus/eQuest to support the BEM community:

SimAUD 2019

EDSL USA at SimAUD 2019

EDSL was at SimAUD 2019, the symposium on simulation for architecture and urban design.
This was EDSL’s first SimAUD event.
Working with professionals, researchers, and students in the fields of architecture, engineering, and sustainability sends a strong message about the power and effectiveness of transdisciplinary collaboration, analysis, and simulation.” said Michael Sawford, Vice President of EDSL USA.
Here are a few items we found of particular interest:
  • Interoperability remains a sticking point in transdisciplinary collaboration workflows.  One of EDSL’s objectives is to minimize barriers across tools and support informational continuity.  Each discipline can work with their best-suited applications while also being able to communicate upstream and downstream with their peers.  To this end, Tas software supports two-way interoperability with EnergyPlus -based tools, and the ability to import eQuest model data.  
  • Parametric optimization is always a popular topic at research conferences, and Tas currently supports LBNL’s GenOpt tool for multiobjective optimizations.   Thanks to the conference presentations and feedback, we are now researching additional optimization algorithms for enhanced flexibility.  
  • A number of presentations focused on reducing simulation times through model abstraction and reducing the number of simulations required.  Tas software can deliver results more quickly thanks to its own fast and robust simulation engine, allowing users to explore the same size design space more quickly, or a larger design space in the same amount of time.  Coupled with the strategies presented could lead to even quicker results.
EDSL Tas table 1
TasGenOpt – Parametric Multi-objective Optimisation analysis in Tas (below: 23 simulations in 7 minutes):

EDSL's Tas software at Georgia Tech

Georgia Tech was an ideal venue for SimAUD, thanks in particular to their innovative school of architecture led by Scott Marble.  Dr Dennis Shelden, head of the Digital Building Lab, gave a thoughtful overview of simulation and technology’s trajectory through the past thirty years, and Dr Fried Augenbroe wowed us with an inspirational collection of his reflections about building simulation and its effectiveness.  
We are especially proud that EDSL’s Tas software is being taught in Dr Augenbroe’s High Performance Building Lab, and are working with the Lab on the Living Building Challenge certification for the new Kendeda Building for Innovative Sustainable Design.  

BuildingEnergy Boston 2019

EDSL USA at BuildingEnergy Boston 2019

EDSL was at NESEA’s BuildingEnergy Boston Conference + Trade Show, it’s been a full week and we are finally getting caught up.

As this was EDSL’s first NESEA event, we weren’t sure what to expect. The organization was great and we were welcomed by the community. We had hoped to attend more classes but thanks to interest at the booth we were afforded little time. It was encouraging to see the diversity of attendees ranging from policy makers, product manufacturers, architects, engineers, and everything in between. The culmination of many discussions with people from diverse backgrounds lead to possibilities for the use of our software in traditional applications and in new directions.

We are very excited to participate in BuildingEnergy New York as it is our home base in the US. We are hoping to build a strong local user group and are looking forward to being involved in the NESEA community going forward.

exhibit 2

Energy, CO2, and Embodied Carbon - how the AEC industry can turn buildings into carbon sinks

Michelle Apigian (ICON Arcitecture) and James Petersen (Petersen Engineering) opened the Keynote session ‘Carbon Drawdown Now! Turning Buildings into Carbon Sinks‘ presented by Chris Magwood (Endeavour Centre), Ace McArleton & Jacob Racusin (New Frameworks). The keynote focussed on how buildings have the potential to become the world’s fifth largest carbon sink, rather than a leading emitter and how the work of the AEC industry is essential for climate justice and social equity.

Free Tas academic licenses

Academic Announcement

EDSL Tas - Free Academic Licenses

EDSL is committed to supporting the academic community and expanding the opportunities available to students and faculty alike. As such, we are pleased to announce that we offer Universities our Tas Engineering thermal dynamic simulation software free of charge to instructors and students. To further support instructors, EDSL will also offer no-cost training and support for course lecturers and teaching assistants.

Academic programs involving environmental or mechanical engineering, architecture, sustainability, building services, or another related field can benefit from Tas Engineering.   It simulates an array of environmental and systems design factors including daylight, natural ventilation, HVAC systems, and climate based daylight modeling. 

Tas in the Classroom

Tas is well suited for learning.  Students and teachers can focus less on working around software limitations and more on describing designs, systems, and their components easily, accurately, and clearly.

With the ability to generate and simulate models quickly and easily, it reduces the friction typically associated with preparing geometry and other data for simulation.

The Results Viewer tool combines and displays results in an integrated environment, making it easier to understand relationships among multiple design factors and their ramifications.

It supports highly granular data input and output, enabling students to investigate thoroughly, and minimizes any ‘blackbox’ circumstances in which assumptions and methodologies are not clearly understood.

The fully-featured Systems module combines diagrammatic-level equipment and system definition with the full flexibility of a component-based design tool.

An array of ASHRAE, COMNET, and NCM(UK) database resources are included, containing constructions, calendars, internal conditions, and weather files.  Together, they serve as an extensible library of components and conditions for students to utilize confidently.  Custom resources can be created for more focused areas of study.


Testimonials from early-adopter students and graduates with backgrounds in Mechanical Engineering and Building Performance

“Tas Engineering software is a great platform for students to explore the world of simulation of buildings and further enhance their building physics knowledge along with understanding the simulation outputs generated.”

“During my curriculum for 2 years at University, I have been exposed to various simulation software packages, which all had different user interfaces and calculation methods. The interface that Tas Engineering provides is very user friendly and as a student it was one of the easiest softwares for me to learn.”

“All modules had in-built tutorial videos which makes it easier for me to troubleshoot problems.”

“I first used Tas when I started my career in the HVAC industry. The Systems module was a great way for me to learn how components are arranged in a system and how they all interact with each other. Creating schematic layouts with custom systems in Tas was a great learning tool and it helped further my understanding of different system types and arrangements.”

“As a student, I would strongly recommend young individuals to use Tas Engineering and enhance their skills.”

Terms and Conditions

The software is to be used for educational purposes only, commercial use will require a paid license.

Typical educational license duration is one semester, and maximum duration is one year.  Alternative terms will be considered on a case-by-case basis.  Licenses are renewable upon request with verified academic credentials.

Instructor-assisted training will be provided at no cost to lecturer(s) and/or teaching assistants of courses relating to environmental or mechanical engineering, architecture, sustainability, building services, or another related field.  Lecturers and/or TAs will be responsible for supporting their students with technical issues. 

Students will have access to the Tas training material, available for download at and as part of the Tas installation.  If instructor-assisted training for students is desired, it will be offered at a discounted rate.