The Heat Atlas Shows Germany’s Hotspots—Risks for the Building Stock

Increasing Heat Stress on the Building Stock

The energy transition increasingly requires reliable and up-to-date data to make informed assessments of developments and design buildings for the future, while ensuring they remain comfortable for residents even as extreme weather events are clearly on the rise. Rising temperatures and recurring heat waves, in particular, highlight the importance of a data-driven analysis of heat stress. With the Heat Atlas, Techem provides a solid foundation for this and makes climatic developments in the building context visible. We summarize the key findings and added value below.

Data-Driven Analysis with Clear Results

The analysis provides a robust data foundation and makes the trend of rising temperatures concretely measurable. This is based on cooling degree days (days on which high outdoor temperatures result in a need for indoor cooling).

Here are the top 10 hottest cities and regions in 2025

• Speyer (Rhineland-Palatinate)

• Heidelberg (Baden-Württemberg)

• Germersheim (Rhineland-Palatinate)

• Rhein-Pfalz District (Rhineland-Palatinate)

• Ludwigshafen am Rhein (Rhineland-Palatinate)

• Mannheim (Baden-Württemberg)

• Southern Wine Route (Rhineland-Palatinate)

• Frankfurt am Main (Hesse)

• Groß-Gerau (Hesse)

• Neustadt an der Weinstraße (Rhineland-Palatinate)

• Regional densification in southwestern Germany

• Strong Indication of Future Need for Action

Building Requirements – Structural Change Due to Climate Change

Rising temperatures are leading to fundamental changes in the requirements for building envelopes, building services, and their operation. New demands are being placed on services related to the building sector, ranging from efficient cooling to the integration of digital technologies that process and display indoor climate data.

Techem is addressing these requirements and implementing concrete measures:

• Smart Metering for energy management of heat pumps and solar systems → Supporting technology for efficient, demand-based cooling

• Multisensor Plus & sensor-based technologies such as Indoor Climate Service → Guidance for effective and proper ventilation as part of indoor climate management

• Digital platform and digitized devices → transparency and controllability

• Monitoring & data analysis → transparent insight into energy consumption

The Heat Atlas illustrates how relevant data and targeted communication can work together to highlight the strain on properties. This topic will receive increasing attention in the future.

Overall, it is clear that managing heat is increasingly becoming a central task in building operations and requires a combination of technology, data, and intelligent management. Data-driven analyses and intelligent solutions will play a decisive role in this regard.

👉 Further information:

Details on Techem’s solutions, which help maintain the energy efficiency of residential units in the face of more frequent heat waves and extreme weather conditions, can be found here.

Image information: Rising temperatures are leading to fundamental changes in the requirements for building envelopes, building systems, and their operation. Techem is addressing these requirements and implementing concrete measures (Image source: Techem).