European households turn to low‑tech tricks to beat the heat

In Spain, residents are combating soaring summer temperatures by keeping rooms dark. They lower blinds, close shutters and curtains early in the morning and ventilate only at night or early dawn, allowing cooler air to stay inside while blocking direct sunlight.

In France, a surge in demand for chalk powder (calcium carbonate) has created shortages as people apply a water‑mixed paste to windows. The white coating reflects a portion of solar heat while still admitting light, helping lower indoor temperatures. Experts note that while such measures can provide relief, they are not substitutes for proper insulation, shading and ventilation.