[*] Replace the traditional light bulbs with energy saving light bulbs in your living room and around your whole house. An 11W energy saving light bulb will output a similar amount of light as a 60W traditional bulb. Each energy saving light bulb can save you up to £7 per year and it will last for 8 years.
[*] Don't leave your TV and home entertainment systems on standby. There's no necessity to do that. Switch it off using its main
switch and then switch off at the wall socket. An appliance left on stand-by will continue consuming 80% of their normal operation energy. So, saying that stand-by saves energy is quite irrelevant. Switching off is what saves energy. There are types of equipment that must not be switched off, though. Home security system and the thermostat should always be left on. Also consult your appliance's owner manual for more info.
[*] Use as much natural light as possible. Open the blinds instead of switching on the light.
[*] During the colder season roll down the blinds and draw the curtains in the evening. It will prevent heat leaking through the windows.