1,633 companies use TRNSYS, based on their job posts and their employees' public profiles. 129 job posts named it from October 2025 to August 2026. Mechanical Engineer roles mention it most.
Which companies name TRNSYS in the most job posts?
Affiliated Engineers, Inc. leads with 67 job posts naming TRNSYS, followed by Inddigo and CSTB. Inddigo is the newest of the five companies in the table, with its first job post naming it in December 2023.
CompanyPostsPeopleRecent job post
Affiliated Engineers, Inc.Professional Services · first seen Sep 2022671
"Ability to use at least one building system simulation tool, including EnergyPlus, IES-VE, TRNSYS, DOE-2 (eQuest), TRACE, CFD, or Radiance, for consulting and analysis."Building Performance Consultant I, Oct 30, 2026
InddigoAdministrative and Support and Waste Management and Remediation Services · first seen Dec 2023353
"La connaissance de logiciels spécifiques au métier est un plus (TRNSYS, Pléiades, DesignBuilder, etc…)"internship in environmental building quality (EBQ) (m/f), Oct 21, 2026
CSTBProfessional Services · first seen Jun 2023334
"Vous avez des compétences en modélisation et la maitrise d’un ou plusieurs logiciels de simulation énergétique dynamique (TRNSYS, Energy Plus, Comfie Pleiades, etc.) seraient un plus."R&D engineer, modeling and data expert, Jun 6, 2025
dbHMSScientific and Technical Services · first seen Sep 2022260
"Experience with TRNSYS, Grasshopper and other "bug suite" tools, Python, or similar scripting/coding."Senior Building Performance Analyst, Feb 24, 2026
ISFH – Institut für Solarenergieforschung Hamelnfirst seen Jun 2023221
"…weitere Möglichkeit ist die Durchführung dynamischer Systemsimulationen mit der Software TRNSYS für unterschiedliche Anlagenkonzepte, mit besonderem Fokus auf Wärmepumpensysteme in Mehrfamilienhäusern."Internship/Thesis: Photovoltaic-thermal (PVT) collectors in combination with heat pumps in residential buildings – stsy042, Sep 23, 2026
TRNSYS appeared in 0.06 in every 10,000 job posts from June to August 2026, against 0.04 from March to May. These are small numbers of job posts, so a few companies can move them.
Show the data
Month
Job posts naming TRNSYS
All job posts
Per 10,000
Oct 2025
14
1,413,673
0.10
Nov 2025
18
1,822,119
0.10
Dec 2025
14
1,236,103
0.11
Jan 2026
12
1,828,002
0.07
Feb 2026
14
1,856,647
0.08
Mar 2026
10
1,850,711
0.05
Apr 2026
9
1,728,886
0.05
May 2026
5
1,821,509
0.03
Jun 2026
11
1,909,496
0.06
Jul 2026
13
1,815,180
0.07
Aug 2026
9
1,835,698
0.05
How many companies named TRNSYS in a job post for the first time in recent months?
In the three months to August 2026, 7 companies posted about TRNSYS for the first time. From March to May, 6 did. That brings the companies naming it for the first time since October 2025 to 23, through August 2026.
March to May 20266
June to August 20267
October 2025 to August 202623
Companies whose first job post naming it appeared in that period. Recruiters, staffing firms and job boards are left out.
How do we know which companies use TRNSYS?
Most of these companies come from employees' profiles: 87% have no job post naming TRNSYS. 58 show up in both job posts and employees' profiles.
How we knowCompaniesShare
Job posts name TRNSYS
21213%
Employees' profiles list TRNSYS
1,42187%
1,633 companies. Each is counted once, under the strongest evidence we have for it.
What size are the companies that use TRNSYS?
Companies with 50 to 999 employees are the largest group of TRNSYS users, at 40%. 275 of its companies have more than 5,000 employees.
Share of its companies
Typical tech page
ShareTypical
Under 50 employees
23%22%
50 to 999
40%38%
1,000 to 5,000
20%17%
Over 5,000
17%23%
Where are TRNSYS companies based?
Italy is 7.9 times as common among TRNSYS companies as on the typical tech page, at 12%. France leads overall with 22%. The United States is less common than usual, at 9.5% against 43% on the typical tech page.
ShareTypical
France
22%4.6%
Germany
13%4.4%
Italy
12%1.5%
United States
9.5%43%
Spain
6.8%1.8%
Canada
4.7%3.6%
Companies in 65 countries and territories. Shares are of companies with a known headquarters country.
Show the data
Country
Companies
Share
Typical tech page
France
354
22%
4.6%
Germany
209
13%
4.4%
Italy
188
12%
1.5%
United States
152
9.5%
43%
Spain
109
6.8%
1.8%
Canada
76
4.7%
3.6%
What else do TRNSYS companies use?
EnergyPlus, Modelica and Dymola show up far more often at TRNSYS companies than at companies of the same size. Next is IES VE: 15% of these companies use it, against 0.15% of similar ones.
Share of the 157 TRNSYS companies counted here whose job posts also name the tool
Typical for companies the same size
Companies that named TRNSYS in a job post for the first time between April and August 2026, ranked by their job posts in those months. AI-native companies get a group of their own, whatever their size. Recruiters and job boards are left out.
Which roles mention TRNSYS most?
No single role dominates for TRNSYS; Mechanical Engineer leads with 17% of the job posts. The top four roles cover 47% of these job posts.
RoleSharePosts
Mechanical Engineer
17%22
Skilled Trades
16%20
Researcher
7.8%10
Consultant
7%9
Performance Engineer
4.7%6
Environmental Health & Safety
3.9%5
Show the data
Role
Share
Oct 2025 to Aug 2026
Mar to May 2026
Jun to Aug 2026
Mechanical Engineer
17%
22
1
6
Skilled Trades
16%
20
4
5
Researcher
7.8%
10
0
2
Consultant
7%
9
2
0
Performance Engineer
4.7%
6
2
0
Environmental Health & Safety
3.9%
5
0
0
About this data
Sumble built this page. Sumble gives sales, marketing and other GTM teams technographics and hiring signals for the companies they sell to: the technologies each company uses, which teams are hiring and for what, and who reports to whom. That helps a team know who to contact, why now, and what to say.
Sumble covers more than 3.6 million companies, 93 million job posts collected since 2022 and 194 million employee profiles, and tracks more than 37,000 technologies. It finds which technologies a company uses by reading its job posts and its employees' public profiles.
Sumble has a free plan, and the same data is available through its API and MCP server.
A company counts when its own job posts or its employees' public profiles name the technology. Hiring is that technology's share of all job posts collected each month. Quotes are copied word for word from the companies' job posts.
Every figure on this page comes from Sumble's own analysis, and you won't find it outside Sumble.
