Numfem Therm, make the right choice.

The first worldwide Revit plugin to automate
thermal bridge & building simulations
without any file exchanges.

From Autodesk Revit

No limit : Numfem Therm is fully compatible with any Revit modeling.

…to Numfem Therm

 with just one click ; no need to use dxf/dwg export-import files.

Obtain room heat losses & thermal bridge coefficients Ψ ; no need to use excel spreadsheets !


Automatate reports

 Use Revit sheets to automatically produce analyzes & calculations reports.

All thermal simulations were made only using native Revit modelings. Numfem Therm handles all thermal Revit informations and it’s compatible with Revit worksharing, design options, phases .

Frequently asked questions

What’s Numfem Therm ?

Numfem Therm is a thermal simulation software, that is directly synchronized with BIM data to simulate the thermal behavior, from a simple thermal bridge to a  whole 2D view.

What Numfem Therm is not ?

Numfem Therm is not a 2D/3D drawing software, because it’s linked to Revit and uses all its modeling capacities.

Who is the software for ?

For all people involved in building energy simulation : architects, project owners, thermal engineers, constructors, manufacturers, energy consultants…

What makes Numfem Therm different from other thermal software on the market ?

Numfem Therm is the only fully connected BIM software for thermal building simulation. It means that you don’t have to export, re-sketch / heal / m odify geometry, assign materials, temperatures … Numfem Therm does it all automatically ! It saves a lot of time, and even permit almost automatic iterative analysis.

Moreover Numfem Therm use a very fast and powerfull finite element solver based on the latest mathematical improvements such as high order finite element, adaptive mesh refinement, multithreaded linear solver…

Is it easy to use ?

If you are already a Revit user, Numfem Therm plugin is child’s play !

How much time can i expect to save ?

First of all, the common traditional approach to achieve thermal simulations requieres to draw the thermal model, assign manually the materials and the boundaries conditions, create reports after calculations…

Sometimes several softwares are needed, that may be inconvenient and time consuming when it comes with design modifications. Additionally, you might have to deal with multiple file types with possible data loss between them.

We’ll never say that approach is not good, we just say that’s just not BIM.

Today, it clearly appears that BIM offers huge benefits in terms of : endless possibilities in modeling, structured data, collaboration, task automations… That’s why we are conviced that BIM can save a lot of time and increase quality.

For instance, i really don’t know how much time is needed to sketch and calculate such models (see below) using a traditional approach : maybe hours, what happens if the models change ? 

Using Numfem Therm plugin, all was done in less than 60 seconds. You can modify your Revit design as you want, just synchronize simulations with one click !

What are the requirements ?

Numfem Therm works under Revit 2020/2021/2022 (not LT version) and under windows operating system with no minimal requirements others than Revit’s ones.

Is there a mac version ?

As a Revit plugin, Numfem Therm supports native windows operating system.

1 – If you use Bootcamp & Windows, it works.

2 – for Apple OS X operating systems you may use Parallels Desktop to get Numfem Therm and Revit work.

What will be the licence types ?

Numfem Therm is available as an annual subscription.

The license is for standalone workers, and is locked to a workstation.

We may propose other license models, feel free to contact us for more informations.

Can i sell your software and/or provide my own trainings ?

Contact us through the contact form, we’re open to discussion.

What about standards compliance ?

We already support :

  • ISO EN 10211 for thermal bridges : psi value, as well as the exterior value for the PHPP, and the interior psi value (for the RT ex/RT 2012/RE 2020).


We may support in the near future :

  • ISO 10077-2 for thermal performance of windows : Uf and Psi edge value.
  • CEN 673 for glass in buiding : Ug value.


Do I have to use specific templates and families ?

No ! You’re free to work as you want.

The connexion with Revit is mainly based on the definition of project/global/shared parameters, so that you can adapt Numfem Therm behaviour to your specific needs.

Does Numfem Therm work with others BIM softwares ?

Numfem Therm is currently compatible with Autodesk Revit, but we may investigate the connection with other CAD softwares (ArchiCAD for example) in the near future.

What about Open BIM ?

IFC is the OpenBIM standard, and fulfills many requirements as far as thermal analysis is concerned.

But right now we’re still focusing on Revit, for it is the only data source that gives us the right level of reliability, readiness, and completeness.

Can i modify thermal datas and geometries in Numfem Therm ?

Numfem Therm is based on a BIM paradigm, that means datas and geometries must be changes in the BIM project.

Revit limits the thermal conductivity to 0.01, how can I set a lower value ?

No worries, it’s possible to override the thermal conductivity through a specific parameter in your material asset.

3D details are time consuming, is it possible to draw in 2D ?

Real 3D details are sometime very complex and time consuming, that’s why Numfem Therm is compatible with 2D drawing details in Revit using filled & masking regions inside views/callouts. Revit is very powerfull for 2D parametric modelings, AutoCAD is not useful anymore !  

How can i generate reports ?

Reports are made directly in Revit using sheets and result pictures created by Numfem Therm.

What about languages, system units and customizations ?

Yes, Numfem Therm is fully customizable as regards to :

  • Language, we already support english and french. We can easily add others languages on demand.
  • Unit system : SI and Imperial
  • The graphical user interface uses modern windows standards, that’s mean it’s fully customizable (themes, dockable panels, layouts…)


How can I link Numfem Therm to other building thermal calculation software?

We’re thinking and investigating on that… If you have some ideas, let us known ! 

Can i import AutoCAD files (dxf/dwg) ?

Revit can import these files in a 2D view, that Numfem Therm can then analyse.

Nevertheless, experience has shown that the best choice is to recreate 2D generic family objects or draftings using filled and masking regions, because DXF/DWG data quality may varying a lot.

What is the roadmap ?

As far as the 2D is concerned, we plan to provide more calculations : Revit tools to facilitate automations, moisture prediction, solar radiation, convection models, transient simulations, parallelization/batching calculations… 

I would like to submit a suggestion, what do I do next?

We’re open to any relevant improvements, contact us in the contact section !

How can I stay up to date with latests news?

Following us on linkedin and youtube in the best way.

Still have other questions ?