Insulate the ceiling roof
A ceiling and good roof insulation can keep the home 5 degrees (Celsius) warmer in winter, and 10 degrees cooler in summer. More comfortable indoor temperatures mean less need for electrical heating and cooling, with savings of about 75% for adding both a ceiling and insulation, or 25% for just adding insulation (if there is already a ceiling). Insulating other parts of the house also helps (e.g. stopping heat loss through windows or under doors), but the highest savings are from roof insulation.