DIY window film and home‑cooling tricks help curb summer heat

A low‑cost removable reflective film, sold for under 30 € per roll, can be applied to interior windows without glue. The electrostatic film reflects UV radiation and blocks most solar energy, lowering indoor temperatures within minutes and offering a tenant‑friendly, reversible solution.

Additional low‑energy strategies include improving insulation, using night‑time ventilation, creating natural airflow with the chimney effect, and shading windows with blinds, curtains, or external foliage. Together, these measures reduce reliance on air‑conditioning, lower electricity bills, and lessen urban heat‑island effects.