Overview

• Experiments by Mirror and Leeds Live found that covering windows entirely with kitchen foil can reduce indoor temperatures from around 28°C to 26°C.
• A single roll of kitchen foil costs as little as 70p to £1.20 at retailers such as Sainsbury’s, Aldi, Asda and Tesco.
• Professionals at H2ouse confirm that foil won’t melt or emit harmful toxins when exposed to intense sunlight.
• Adam Pawson of Safestyle advises fitting foil on the outside of windows to prevent excessive glass heating and seal damage.
• Some specialists warn that heated foil still transfers warmth indoors, which can limit its effectiveness over longer periods.