In winter, homes are centrally heated. Heating is normally regulated by a timer and set to go off at certain times of the day when the family is not at home and at night when you are asleep. If you are not warm enough, please discuss this with your host. It is advisable to keep a woollen cardigan or jacket handy for extra warmth in or out of the home. English homes are not usually air-conditioned in summer but the climate is rarely unbearably hot and rooms can be cooled by opening a window.