Workplace Productivity Plummets as German Heat Protection Rules Kick In at 30 Degrees
18.06.2026 - 12:22:57 | boerse-global.de
As temperatures climb across Europe, German employers are legally required to activate cooling measures once indoor thermometers hit 30 degrees Celsius—but the economic toll is already being tallied. Every additional degree above that mark shaves roughly three percent off workplace output, according to Allianz Trade economist Katharina Utermöhl.
Germany does not grant workers a blanket "hitzefrei" (heat day off). Instead, the Arbeitsstättenverordnung (Workplaces Ordinance) combined with the Technical Rules for Workplaces (ASR A3.5) sets a graduated obligation. Employers must start taking action at 26 degrees room temperature. At over 30 degrees, protective steps such as ventilation, sun shading and providing drinking water become mandatory. Rooms exceeding 35 degrees are deemed unsuitable for work unless additional safeguards are added.
The productivity hit is not limited to output. Energy costs rise an estimated 1.2 percent. Sickness absence jumps 3.5 percent in temperatures above 30 degrees, and during prolonged heatwaves that figure climbs to six percent. Accident risk also spikes: Switzerland’s Suva accident insurance fund records a seven percent increase in workplace injuries at that threshold. The Austrian Trade Union Federation (ÖGB) warns that reaction speed and coordination drop by a quarter at 30 degrees; by 35 degrees, performance can slump by up to 50 percent.
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Construction sites face particular scrutiny. In mid-June 2026, Swiss union Unia and Suva announced stepped-up inspections on building sites, checking for drinking water availability and shaded breaks. Unions demand work stoppages above 33 degrees, with break time counted as working hours. Since August 2025, Germany’s Technical Rule A5.1 mandates that employers provide UV-protective clothing as soon as the UV index reaches 3. The Berufsgenossenschaft Bau (Construction Trade Association) subsidises cooling vests and high-UPF garments to prevent occupational skin cancer.
Switzerland and Austria approach heat regulation differently. Swiss law relies on a general duty of care with no fixed maximum temperature; the State Secretariat for Economic Affairs (Seco) recommends 23 to 26 degrees. Pregnant and breastfeeding employees in Switzerland may stop work at 28 degrees. Austria’s heat protection ordinance applies to outdoor work from a felt temperature of 30 degrees and requires crane operators to retrofit air-conditioned cabins by June 2027.
The idea of introducing a siesta has rekindled debate. Utermöhl calls it "necessary risk management to maintain performance capacity." But the German Trade Union Federation (DGB) is cautious. Executive board member Anja Piel advocates sector-specific solutions and warns against diluting the Working Hours Act. The DGB opposes plans to replace the eight-hour day with a weekly maximum.
Long-term fixes centre on building adaptations. Experts point to green roofs, façade planting and shading as ways to make workplaces permanently resilient to heat—adaptations that may soon become as essential as the drinking fountains and fans mandated today.
