Overview
- Physicist Werner Gruber and multiple outlets note that fans only move existing air and do not lower the temperature of a closed room, though they help personal cooling when airflow hits sweaty skin by speeding evaporation.
- Official and survey data show a sharp uptick in demand for true cooling: German production and imports of climate devices rose steeply in recent years and household ownership climbed, with mobile units the most common choice.
- Coverage now focuses on practical trade-offs for buyers: mobile monoblock units are cheaper and plug‑and‑play but often less efficient because they create underpressure that draws warm outside air in, while split systems cool more efficiently but cost more and usually need professional installation.
- Journalists detail running costs and legal limits consumers must weigh, using examples such as a 1 kW mobile unit costing about €90 for 300 hours at €0.30/kWh and noting that EU F‑Gas rules require certified technicians for work on refrigerant circuits and that landlords or owners may need to approve fixed installations.
- Low‑energy alternatives remain useful: water‑based air coolers and shading, timed ventilation and plants give localized or passive relief—evaporative cooling works best in dry air—while rising AC uptake raises concerns about higher household energy use, supply shortages and installation bottlenecks.