From October, average household energy bills are expected to increase, prompting fresh concern about winter heating costs. Should I leave the heating on all day? That has led some to speculate whether doing away with this and keeping the heating on all day – at lower temperatures – can reduce this cost. How to save money on energy billsTurn your thermostat downStephen explained the easiest way to cut money off your bill is to turn your thermostat down. Boiling the kettle for a hot water bottle will cost around 6p, and be significantly cheaper than turning up the heating.