Everything that heats, and almost nothing else
When the bill climbs in January the reflex is to look at lights and standby devices. But in an ordinary home, lighting and phantom consumption are a small share of the total.
The winter jump comes almost always from three things: heating air, heating water, and in some cases drying clothes. Everything else is background noise by comparison.
Heating air: how, not how long
The useful question is not how many hours the heating runs, but what does the heating. An electric radiator delivers one kilowatt of heat per kilowatt consumed. A heat pump delivers several times more from the same electricity.
In a home that already has air conditioning with a heating function, using it instead of the radiator is the decision that moves the winter bill most, and it costs nothing to install.
Heating water: the cylinder works twice as hard
In winter the mains water arrives much colder, and the cylinder has to raise it by more degrees to reach the same shower temperature. Same appliance, same usage, and yet more consumption.
If the element is also coated in limescale, the appliance runs longer for the same result. It is the time of year when a service pays for itself fastest.
Contracted supply, paid for whether you use it or not
Contracted supply is paid every month, used or not. Many homes carry a level inherited from an era of gas cooking and no air conditioning, and others have too little and trip every time two appliances coincide.
Both situations cost, one in standing charges and one in nuisance. Measuring what is actually used before contracting or reducing is a single visit's work.
What is not worth chasing
Unplugging the phone charger and hunting red standby lights gives a feeling of control and almost no saving. It is time and mental energy spent on the decimal place.
If you want one useful gesture this winter, make it checking what heats the house. That is where the bill is decided.
