4.Window dressing

Window glass is responsible for a substantial amount of unwanted heat transfer. Adjustable external awnings offer shade in summer, yet admit sun in cooler months. “They’re one of the most energyefficient ways to manage heat, by preventing it getting to the glass in the first place,” says Jenny Brown of Luxaflex. Inside, ‘honeycomb’ or ‘cellular’ blinds, such as Luxaflex’s ‘Duette Ménage’, are air pockets that insulate the window; the Luxaflex range claims to reduce heating and cooling costs by up to 49 per cent. “They also have a tighter fit, so there are minimal gaps, which is a key difference to other treatments like roller blinds,” adds Jenny. Somfy’s Thermosunis Wirefree indoor sun and temperature sensor automatically opens and lowers coverings to aid energy saving.