You should heat your home to a temperature that is comfortable for you. Low indoor temperatures can have a serious impact on your health, especially if you have medical conditions or are older. Simple changes can help to keep you and your home warm. These include:
try to heat rooms you spend a lot of time in, such as the living room or bedroom, to at least 18°C
try to reduce draughts; you can fit draft excluders around doors cheaply
keep your bedroom windows closed at night
wear several layers of thinner clothing; this could keep you warmer than one thicker layer