Unplug devices

 

Just switching off an appliance or gadget is not enough – you should unplug it completely. Some appliances give off heat even when switched off. For example, a phone charger might feel warm after a whole day of being plugged into the wall, even if it has not been used.

How effective?  I took my phone charger and desktop computer plugs out from their sockets, but I am not sure how much heat I actually reduced. The room temperature felt the same.