The NHS recommends that those who are not very mobile, are 65 years or older or have health conditions should heat their home to at least 18 degrees. If you are healthy and active you can have your home cooler than 18 degrees, as long as you are comfortable. The NHS recommends babies should sleep in rooms heated between 16 and 20 degrees. Temperatures that are too high or low can prevent health risks for vulnerable, elderly or newborns. Low temperatures can cause hypothermia but also increase damp and mould in the home. To prevent mould and damp, homes should be heated to at least 16 degrees. Of course what is comfortable for you, will depend on your age, health and other factors.