Octopus Energy is urging UK households to adopt the '4pm rule', a tip previously championed by Martin Lewis, to reduce heating costs as temperatures drop. The rule involves closing curtains or blinds before sunset to trap heat, potentially cutting heat loss by up to 17%.
The energy supplier advises keeping curtains open during the day to let in solar warmth, then closing them as the sun sets—around 4pm in mid-November. This simple measure can help delay turning on central heating, lowering energy bills.
Martin Lewis first shared the advice on ITV's The Martin Lewis Money Show in 2022, calling it 'tactical curtains'. His Money Saving Expert team confirmed the tips remain effective. Lewis recommended using thermal or lined curtains, adding that even a fleece lining can improve insulation.
For best results, Octopus Energy suggests thick, heavy fabrics like velvet or wool, with a thermal or blackout lining. Curtains should extend a few inches beyond the window frame and reach the floor to create a seal. A pelmet or valance can further prevent heat loss.
