23.01.2026

AI in building physics: heat, light and algorithms

Building design

How algorithms and modern measurement technology are revolutionizing building physics. Photo by Than Nguyen on Unsplash.

AI in building physics: heat, light and algorithms – it sounds like a dream of the future, but it has long been the present on building sites and in planning offices. While some are still struggling with U-values on paper, others have long since been using neural networks for daylight simulations. Anyone who doesn’t get on board now will be mercilessly overrun by the next heat wave. The question is no longer whether AI will revolutionize building physics, but only how radical the change will be.

AI technologies are permeating building physics and fundamentally changing simulation, analysis and design.
Germany, Austria and Switzerland are at the beginning of a paradigm shift between skepticism, experimentation and pioneering spirit.
Algorithms are optimizing heat and light calculations, accelerating planning processes and enabling more sustainable buildings.
Digital tools challenge the traditional understanding of engineering and demand new skills.
The use of AI offers opportunities for energy efficiency, comfort and climate protection – but also risks due to black box models and data dependency.
AI-based tools are shifting roles in planning teams and making building physics an integral part of digital process chains.
The debate about control, transparency and responsibility is sparking a new dynamic in the industry.
Global pioneers are demonstrating how artificial intelligence is reprogramming building physics – while German-speaking countries are still caught between innovation and bureaucracy.

Thermal insulation, lighting comfort, algorithms: AI as a game changer in building physics

For a long time, building physics was considered a sober craft – characterized by standards, tables and rules of thumb. But the days when building physicists were “U-value prophets” juggling with Excel lists for insulation thicknesses are finally over. Artificial intelligence is shaking up the field at a speed that makes many an expert dizzy. Today, planners train neural networks to identify thermal bridges, have algorithms calculate daylight simulations in seconds and use AI-based optimization processes to spit out component structures for passive houses. Building physics is becoming a field of experimentation for deep learning, big data and smart algorithms. The traditional interface between architecture and technology is shifting – and with it the self-image of an entire profession.

Germany, Austria and Switzerland are regarded as ambitious, but also stolid. While AI-based simulation platforms have long been standard in international research clusters, German-speaking countries remain cautious. Initial pilot projects in Vienna, Zurich and Munich show what is possible – such as automated design optimization based on building databases or the dynamic control of shading elements using learning algorithms. But the big breakthrough has yet to come. There are many reasons for this: technical uncertainties, regulatory gray areas and a deep-rooted skepticism towards black box systems. Who wants to take responsibility for an AI-generated energy concept if the proof has to be provided in court or in fire protection proceedings?

Nevertheless, the innovation curve is pointing steeply upwards. AI-based tools such as generative models for material selection, predictive algorithms for forecasting user behavior or automated mesh optimizations in CFD simulations are conquering the everyday life of planning offices. The speed at which variants are simulated, optimized and visualized today is pushing the boundaries of traditional software – and opening up new possibilities for sustainable, high-performance buildings. The question is no longer whether AI will become part of building physics, but how quickly the industry will adapt.

It is particularly exciting where AI and building physics merge: in the development of adaptive façades, self-learning shading systems or real-time analysis of user comfort during operation. Algorithms use sensor data to predict how temperature, humidity and light will change over the course of the day – and control ventilation, blinds or heating systems accordingly. Humans take a back seat and the machine takes over the fine-tuning of energy processes. For architects and engineers, this means less gut feeling, more data-driven design – and new dependencies on digital tools.

So it’s no wonder that the debate about AI in building physics is heated. Some celebrate the paradigm shift, while others warn of a loss of control and a lack of transparency. But one thing is certain: anyone who continues to work with spreadsheets will quickly be overtaken by algorithms. The future of building physics is digital, adaptive and anything but monotonous.

Digital simulations and AI: from black box to integral tool

Traditional building physics simulation always had one decisive disadvantage: it was slow, complex and usually only operated by specialists. With the triumph of AI, this is changing rapidly. Suddenly, hundreds of variants for daylight, thermal insulation or acoustics can be calculated in minutes instead of days. Machine learning models analyze huge amounts of building data, recognize patterns that escape the human eye and suggest solutions that surprise even experienced experts. What used to be considered a black box is now becoming an integral part of digital process chains – provided you understand what makes the algorithm tick.

This is one of the biggest challenges: The new tools are powerful, but they require a whole new level of technical understanding. If you want to use AI-supported simulations sensibly, you not only need to know the physical principles, but also how training data is processed, which parameters influence the models and how to interpret results critically. Building physics is thus becoming a discipline at the interface between engineering, computer science and data analysis. A traditional degree is no longer enough to cope with the change – further training in data science and algorithmic modeling is becoming mandatory.

At the same time, the roles in planning teams are shifting. Building physicists are becoming data curators, modelers and process managers. Interdisciplinary work is becoming a prerequisite, because without close collaboration with software developers, architects and operators, the potential of AI will remain untapped. New job profiles are therefore emerging in pioneering projects in Switzerland, for example: Data Engineers for building simulation, AI Architects or Digital Building Physicists. The industry is reorganizing itself – and some of the old masters still have to get used to the new reality.

However, the enthusiasm for AI is not undivided. Critics warn against flying blind in a fog of data, errors caused by poor training data or over-optimized models that have little in common with reality. The danger of AI solutions becoming opaque black boxes is real – and poses new liability issues for planners, developers and authorities. Who is responsible if an AI-optimized façade system fails? How can we understand why an algorithm prefers certain variants? The industry must learn to combine digital transparency with physical traceability – otherwise there is a risk of reverting to analog uncertainty.

Nevertheless, the advantages outweigh the disadvantages. AI-supported simulations not only speed up planning, but also create space for creativity and innovation. They liberate building physics from its niche and turn it into a driver of sustainable architecture. Anyone who masters the new tools can orchestrate light, heat and materials with precision – and thus create buildings that are not only efficient but also surprisingly comfortable.

Sustainability Reloaded: AI and the new demand for energy-efficient architecture

Sustainability has long been paid lip service in building physics, often reduced to minimum standards and certificates. AI has given the topic a new dynamic – and a new aspiration. Today, building concepts can be examined in real time for their ecological footprint, variants can be compared and optimization potentials can be identified that were previously lost in the thicket of standards. AI models not only calculate energy requirements, but also predict how user behavior, climate change or material aging will affect the performance of a building. Suddenly, sustainability is becoming concrete, measurable – and uncompromisingly verifiable.

In German-speaking countries in particular, the potential of AI for sustainable building physics is still underestimated. The discussion often revolves around costs, liability and data protection – yet AI-based tools could accelerate the transition to climate-neutral buildings like no other technology. Adaptive shading systems, smart controls for heating and cooling or predictive maintenance concepts do not arise by chance, but are based on data-driven models. The best examples can currently be found in research buildings, innovation districts or pioneers such as ETH Zurich or TU Vienna. However, the path to widespread use is rocky – and involves education, standards and a cultural change in planning.

The sustainability challenges are enormous. Energy efficiency alone is no longer enough – we need life cycle analyses, resource optimization and the integration of renewable energies into complex building systems. This is where AI comes into its own: It recognizes patterns in consumption data, identifies weak points in operation and suggests targeted measures to reduce CO₂ emissions. Machine learning algorithms can even predict how building concepts will perform under changing climate conditions – an invaluable advantage in times of increasing weather extremes.

But here too, technology alone is not enough. The integration of AI into sustainable building physics requires new skills, open data platforms and close collaboration across disciplines. Architects, building physicists and operators must learn to deal with uncertainties, validate models and critically scrutinize results. The future of sustainable architecture is not being created in an ivory tower, but in the interaction between humans, algorithms and the built environment.

The vision is clear: AI makes sustainability an integral part of architectural quality – and gives building physics the role it deserves. Not as a brake pad, but as a driver of innovation for the buildings of tomorrow.

Global influences, local blockades: Between pioneering spirit and paragraphism

An international perspective shows: While AI has long since become the standard in building physics in the USA, Scandinavia and the Far East, German-speaking countries remain in experimental mode. Global tech companies are investing billions in smart building technologies, start-ups are developing self-learning lighting systems and automated energy concepts, and entire districts in Singapore are being optimized using AI. The architecture industry is facing a turning point – and Germany, Austria and Switzerland are in danger of missing the boat. The reason? Bureaucratic hurdles, fragmented responsibilities and a deep skepticism towards the loss of control through algorithms.

The dispute over responsibilities is symptomatic. Who is liable if an AI-optimized building does not perform? How can it be proven that a machine learning model is physically correct? The industry is looking for answers – and has so far only found them in pilot projects and research laboratories. Politicians are struggling with standards and approval procedures, planners with the complexity of new tools and building owners with the question of who they can trust at all. As a result, many innovations remain stuck at the prototype stage, while global competitors have long since scaled up.

But there are rays of hope. In Zurich, for example, platforms are being created that provide AI models for building physics as open source, making access easier for everyone involved. In Vienna, planning processes are being digitalized in order to integrate AI optimizations directly into the design phase. And in Germany, the number of start-ups with fresh ideas for lighting simulation, energy concepts and smart buildings is growing. The industry is waking up – even if there is still a long way to go from individual projects to widespread application.

The debate about AI in building physics is more than just a technical dispute. It is about the fundamental question of how much decision-making power can be delegated to algorithms – and how planners, operators and users can assert themselves in an increasingly data-driven construction world. Anyone who views AI purely as a tool is underestimating its disruptive potential. Building physics is being reprogrammed – and with it the self-image of an entire industry.

In the end, the realization is that those who ignore AI will not only miss out on the global discourse, but also risk degrading building physics to a mere service – controlled by software, controlled by data and decoupled from architectural quality. The challenge is to actively shape the new tools instead of passively enduring them. This is the only way for building physics to remain what it should always be: a driver of innovation, sustainability and architectural excellence.

Conclusion: Algorithm beats rule of thumb – and building physics reinvents itself

The integration of artificial intelligence into building physics is not a fad, but the beginning of a new era. Heat, light and sound are no longer calculated by hand, but optimized, simulated and controlled by algorithms. For planners, this means getting out of the comfort zone and into the digital arena. Those who seize the opportunities can create more sustainable, comfortable and efficient buildings than ever before. Anyone who hesitates will be overrun by the next wave of innovation. Building physics is becoming a playing field for AI – and those who don’t play along will be left on the sidelines. Welcome to the age of algorithmic building physics – where the thumb value has finally had its day.

09.10.2025

Design, Translated: Branchennews

Searching for Clues on Slate Islands

Building design

The poetry collection "Schiefern" by Esther Kinsky explores the analogy between human memory and metamorphic rock. Photo: Suhrkamp — The poetry collection "Schiefern"

Esther Kinsky’s poetry collection *Schiefern* explores the analogy between human memory and metamorphic rock—a sensory quest for the inanimate.

Esther Kinsky’s poetry collection *Schiefern* explores the analogy between human memory and metamorphic rock. Photo: Suhrkamp

The poetry collection “Schiefern”

On the map, they appear as small specks off the west coast of Scotland—so small that it’s easy to overlook them. You have to seek them out specifically to find them. You don’t just stumble upon them. Scotland’s Inner Hebrides, an archipelago at the northernmost tip of the United Kingdom, are a popular travel destination. Those who come here yearn for the unspoiled, the wild, the rugged. For the salty wind that tangles itself in your hair and clothes, making them stiff. For the Atlantic, whose waves crash against the black rock. Gneiss. Granite. Basalt. Slate.

Esther Kinsky, a translator and poet who was awarded the “Hain. Geländeroman” in the fiction category, has dedicated a collection of poems with the simple yet evocative title “Schiefern” to slate and to the region where this sedimentary rock was quarried for centuries.

The quarries on the Slate Islands are still there, as are the remnants of an industry that has since been shut down. Kinsky embarks on a journey of discovery and captures her observations of nature in words that are enigmatic to decipher and sweep the reader away into the remoteness of the Inner Hebrides, to the black, roaring sea, above which the reader drifts, like an invisible figure floating in the space of thought that Kinsky weaves with her words.

It is precisely there, in this space of the imagination, that the analogies between something thoroughly lifeless and the human can be found. Few people appear in this three-part volume, yet it is by no means lacking in humanity. It is, in fact, quite astonishing how sensually one can write about waves carrying spray and “rocks with a / surface like petrified, gentle ripples” without slipping into kitschy romanticism.

“Nature Writing”

Since the 18th century, nature has inspired writers to make it the central protagonist of their works. In the English-speaking world, “Nature Writing” refers to the expansive literary descriptions of trees, meadows, flowers, and downpours. In German, the terms “Naturpoesie” (nature poetry) or “Naturlyrik” (nature verse) have become established. Esther Kinsky has stood out in literature for years with this kind of nature poetry.

In 2013, in *Naturschutzgebiet* (Nature Reserve), she wove together four cycles of poems about decay and growth, taking a neglected city park as her starting point. If one were to classify Kinsky’s work as “Nature Writing,” she would be quick to disagree. In an interview with Deutschlandfunk, she once said that she did not see herself as part of the tradition of nature writing. The term is too vague, she said, and too broad in what it encompasses and what it does not. “Nature writing” can be anything, she says. Why not her latest work, *Schiefern*, one might counter?

The Layers of Time

Early on in *Schiefern*, the word “memory” appears—“as a space of absences, moved by the transparent hand of unpredictable synapses and incalculable shifts of deposits in the slowly formed and deepened furrows and folds of the brain.” Kinsky is concerned with the layers of time that accumulate over memories. First very gently, then more clearly, she draws linguistic parallels between human memory and the history preserved on the surface of boulders, over which the tides and the passage of time have swept for millions of years.

The past lies preserved in the STEIN; it need only be read from its folds, as if the STEIN were an old, beloved elder whose weathered face bears the traces of life. Kinsky writes of “signs without hand or foot / in STEIN that no one / can make sense of / except as the greatest possible past.”

“Schiefern” could be the modern sequel to Adalbert Stifter’s 1853 collection of stories “Bunte Steine” and join the ranks of “Granit,” “Kalkstein,” and “Turmalin.” But as deceptively idyllic as Stifter’s detailed, Biedermeier-style depictions of nature are, Kinsky’s descriptions of the Slate Islands are anything but charming and cozy. The chill of the surroundings seeps through her words. There is a harshness in them that one would not want to imagine away.

Information about the book

Esther Kinsky: Schiefern.
Price: 24.00 euros
Austria: 24.70 euros
CH: 34.50 Swiss francs
Published: March 23, 2020
Hardcover, 103 pages
ISBN: 978-3-518-42921-1

30.10.2024

Project

Rakotzbrücke freshly restored

Building design

One of Lusatia’s most famous landmarks has been freshly renovated. The spectacular bridge structure is a highlight in the Azalea and Rhododendron Park in the east of Saxony.

One of Lusatia’s most famous landmarks has been freshly renovated. After years of renovation, the Rakotzbrücke is shining again. The spectacular bridge structure is an important highlight in the large azalea and rhododendron park in the east of Saxony.

The small village of Kromlauhas just over 300 inhabitants . Nevertheless, it can be seen in many photos. To be more precise, it is not the village that is the subject of the photos. Rather, it is the spectacular Rakotzbrücke bridge that fascinates. It is located in the middle of the large azalea and rhododendron park. The striking arch of this stone bridge is breathtaking. Today more than ever. After years of restoration, the bridge is once again visible.

Kromlau is a district of Gablenz in the district of Görlitz. Hardly anyone would know the village if it wasn’t home to the largest rhododendron park in Germany. It attracts many plant lovers. But many are also drawn there because it is home to the famous Rakotzbrücke bridge. The Kromlau Azalea and Rhododendron Park covers around 200 hectares. This large landscape park is the largest rhododendron park in Germany. Visitors do not have to pay admission. The Rakotzbrücke bridge and other stone sculptures are also accessible at all times.

Did you know? The park and flower festival has been held in the Kromlau Azalea and Rhododenron Park since 1965. Well over 30,000 visitors come to the annual festival, which takes place at Whitsun. By comparison, only just over 300 people live in Kromlau itself.

The beginnings at Gut Kromlau

A contemporary of the famous Hermann Ludwig Heinrich Prince von Pückler-Muskau acquired the Kromlau estate in 1842. Shortly afterwards, he began planting the first native and exotic trees and shrubs. He was also known as the little Pückler. As such, he spared no expense. He had ponds created on almost 800 acres and hills heaped up, which he crowned with oak trees. Rare trees and shrubs, mythological and rococo statues and basalt grottoes were created. The famous arch of the Rakotz Bridge is also one of them. It is made of boulders and basalt stone. The lord of the manor had this material brought in from various quarries in Saxon Switzerland and Bohemia. Ox carts mastered the transportation.

New owners, new activities

Friedrich Herrmann Rötschke exchanged the Kromlau estate with its Rakotzbrücke bridge for other building plots some 30 years after acquiring it. In the years that followed, ownership changed hands several times. It was not until 1889 that peace returned. Count von und zu Egloffstein-Arklitten acquired the site. He commissioned the horticultural inspector Georg Eichler to maintain the grounds. He added rhododendrons and azaleas to the existing trees and shrubs. Planted on a large scale, they contributed to the harmonious appearance of the park. The garden designer also planted certain flower varieties for sale. These generated welcome additional income. These in turn benefited the further development of the park. After the Second World War, the landscape park with the famous Rakotzbrücke bridge became public property. It was not until the mid-1960s that it received renewed attention. The park was once again maintained and reconstructed. The Rakotzbrücke bridge remained a special attraction.

You can see more impressions of the bridge in this video.

The Rakotz Bridge

Alongside Kromlau Castle, the Rakotz Bridge is one of the most important structures in the park. Its stone arch is unusually round. When its semicircle is reflected in the lake, a perfect circle appears in the water. Built from basalt and fieldstone, the bridge spans the Rakotzsee lake below over a length of 35 meters. Although numerous hiking trails cross the park, the bridge may no longer be entered.

Did you know? Only when the water level in the Rakotzsee is right does the reflection on the surface of the water complete the Rakotzbrücke into a perfect full circle. To prevent the water from gradually seeping into the ground, the lake bed was sealed with bentonite sealing sheets during the bridge renovation.

Rakotz Bridge equals Devil’s Bridge

The roots of the village of Kromlau lie in the Sorbian language. It is therefore not surprising that the name of the bridge is of Sorbian origin. Rakotz means crab in the Sorbian language. This is why the Rakotz Bridge is also known as the Devil’s Bridge. People used to believe that only the horned Beelzebub could build such a filigree bridge arch. Today, the bridge attracts photographers from all over the world. The photos usually also include the sculpture behind the bridge, the organ. The Rakotzbrücke’s reflective round arch made its biggest appearance in the fairytale film “The Sorcerer’s Apprentice”.

Renovation of the Rakotzbrücke

The municipality of Gablenz is now the owner of the landscape park. In 2018, it was awarded funding from various federal, state of Saxony and EU programs. Since then, a lot has changed at the Rakotzbrücke bridge and in the rhododendron park. Various types of construction work have been carried out. In addition to the renovation of the Rakotzbrücke bridge, a group of basalt columns and the grotto between the Rakotzbrücke bridge and the flight of steps, which collapsed in 1956, were also renovated. The repairs have now been completed. The construction fence has been removed and the associated lake has also been filled with water again. The scaffolding around the Rakotzbrücke bridge was removed in November 2020. After the bridge was renovated, the lake was sealed. Because only a constant water level can bring out the mirror effect perfectly.

Did you know? The renovation of the Rakotzbrücke bridge initially went according to plan, but had to be interrupted due to an unexpected visitor. Two protected bat species, the greater mouse-eared bat and the pug bat, were hibernating in their hiding places on the bridge, which is why the renovation was suspended for a few months so as not to disturb the animals.

In addition to the famous Rakotzbrücke bridge, other sculptures have been given a new lease of life. The Richterstuhl stone group and the historic bridge on the island pond in the west of the park have also been renovated. Although it was not possible to hold a park festival in early summer 2021 due to the coronavirus, many visitors came to the reopening of the park. The entire park was upgraded over a total of four years. This includes 8.5 kilometers of park paths. Forgotten paths around the island pond were also rebuilt. A fountain ensures that the pond is filled with water again. The new Asian Bridge is now reflected here. New plants have also been planted. The main parking lot at the entrance to Kromlau has been given an information point with public toilets. This important cultural site has now been secured for the coming decades.

Fancy another bridge? Let us show you one of the longest pedestrian suspension bridges in the world – the “Arouca 516” in the Arouca Geopark.