When Your Home Office Turns Into a Sauna: What German Law Says About Working in the Heat
Published on 07/29/2026 at 19:11 | Redaktion boerse-global.de
As summer temperatures climb across Germany, thousands of employees logging in from their kitchen tables and spare bedrooms are discovering a problem their office-bound colleagues rarely face: there's no facilities manager to call when the thermometer hits 30 degrees.
Unlike traditional workplaces, where employers must maintain a maximum indoor temperature of 26 degrees Celsius under workplace safety regulations, home offices operate in a legal grey zone. A Dekra safety expert clarifies the situation: once the mercury passes 26 degrees, employers should recommend cooling measures. At 30 degrees and above, that recommendation becomes an obligation to act.
Practical solutions the law doesn't mention
For those sweltering at their desks, the market offers options at every price point. The TriPole USB desk fan, measuring just 11.5 centimeters tall with three speed settings, sold more than 4,000 units last month at 14.98 euros. Mini evaporative coolers like the Evapolar evaLIGHT plus use water evaporation to chill the immediate workspace. The ArsMotin portable model runs on a 4,500 mAh battery, costs roughly 20 euros, and offers four settings — no power outlet required.
For whole-room cooling, mobile monoblock units such as the TCL air conditioner P09F4CW1 deliver 9,000 BTU at 449.99 euros, combining cooling, ventilation, and dehumidification.
A radically different approach
An Austrian startup called so.cool is developing the TerraBreeze, an air conditioner that eliminates the need for an external unit or exhaust hose. It relies on phase-change materials and terracotta pipes to cool spaces up to 50 square meters with 12,000 BTU. Pre-orders are open at 3,000 euros, though the product won't launch until 2027.
Heat pumps can also reverse their heating cycle to cool buildings. Specialists recommend installing a dew-point sensor to prevent condensation, and the system becomes particularly efficient when powered by surplus solar electricity from rooftop photovoltaic panels.
The insulation factor
No cooling technology can compensate for poor building insulation. Data from the Bau-Holz trade union illustrates the difference dramatically: in insulated homes, indoor temperatures reached just 24.5 degrees Celsius when outside temperatures exceeded 37 degrees. Uninsulated buildings saw indoor readings climb to 29.5 degrees.
Despite these benefits, the insulation materials market has collapsed roughly 30 percent since 2021. Germany's building renovation rate stood at only 0.9 percent in 2024. Property experts recommend external sun shading and smart-home automation as additional measures.
Simple rules for hot days
The campaign group Aktion DAS SICHERE HAUS advises a handful of straightforward practices: ventilate only at night or in the early morning, switch off unused electronics, drink at least 1.5 liters of fluid daily, and retreat to cooler rooms such as basements when necessary.
In Heidelberg, the city has established a "Task Force Heat Protection" that distributes mobile air conditioners to social facilities and publishes digital "cool maps" showing drinking fountains and shaded locations.
For home-office workers hoping for official "heat-free" status, the legal path remains unclear. Employers can adjust working hours to cooler morning periods or introduce siesta-style schedules — but the responsibility for keeping cool ultimately falls on the individual worker, armed with fans, timing, and a bottle of cold water.
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