A tumble dryer is one of the thirstiest appliances in the house, and for much of the year you do not need it at all. There are cheaper ways to get a load dry, from the entirely free (a washing line and a hard spin) to a couple of low-watt gadgets that cost pennies a session. The skill is in matching the method to the weather, the space you have and how quickly you need the clothes back.
Why the tumble dryer is the expensive option
A tumble dryer dries clothes by heating air and tumbling the load through it, and heating air takes a great deal of electricity. A traditional vented or condenser dryer pulls something like two to three kilowatts while it runs, so a full cycle can get through a few units of electricity; at an example price of 30p per kWh that puts a single load somewhere around 60p to 90p, and several loads a week mount up over a year. Newer heat pump dryers are far gentler on electricity, often using roughly a third as much, though they cost more to buy and dry more slowly. The full breakdown sits on the tumble dryer running cost guide; the point here is that almost any method without a large heating element undercuts it, so the dryer is best kept for the days nothing else will do.
Get more water out before you start
The biggest free win happens in the washing machine, before drying begins at all. A faster spin flings more water out of the fabric mechanically, and water thrown out by the spin is water you do not then have to evaporate with electricity or time. Selecting a 1400 spin rather than 1000, where the fabric can take it, leaves the load noticeably drier coming out of the drum, which shortens every drying method that follows. Delicate items and certain fabrics need a gentler spin, so it is not a blanket rule, but for towels, bedding and everyday cottons a hard final spin is close to free money. The washing machine running cost guide covers the spin settings, and washing on a sensible cool cycle keeps the wash itself cheap to begin with.
The free option: line and air drying
Outdoors on a breezy day, even in winter, a washing line dries a load for nothing. Wind matters more than warmth here, since moving air carries moisture away even when it is cold, so a bright blustery January afternoon can dry a line of washing surprisingly well. Indoors, a clothes horse near a slightly open window or in a room with decent airflow costs nothing to run either, though it is slow and, done carelessly, it dumps moisture into the house. Air drying is the cheapest method there is, and for households with outdoor space and a flexible routine it handles most of the year on its own.
Heated clothes airers
A heated airer is a folding rack with warm bars, and its appeal is the modest power draw: typically somewhere around 100 to 300 watts, against the two to three kilowatts of a tumble dryer. Run a 300 watt airer for, say, five hours and you have used about 1.5 kWh, which at an example 30p per kWh is roughly 45p, and a smaller model left on for a shorter spell costs less again. Draping a sheet or a fitted cover over the loaded airer traps the warm air around the clothes and speeds things up considerably for no extra electricity. Drying is slower than a dryer, so an airer suits a household that can hang a load in the evening and collect it dry the next day rather than one needing clothes back within the hour. To check the figure for your own model, its wattage and a typical run time go straight into the running cost calculator.
Dehumidifiers: drying the room, not the clothes
A dehumidifier takes a different approach. Instead of heating the washing, it pulls moisture out of the air in the room, which speeds the drying of anything hanging there and, as a bonus, protects the house from damp and condensation. A typical domestic dehumidifier draws around 150 to 300 watts, similar territory to a heated airer, so running one for a few hours to dry a room of washing costs pennies rather than pounds. The water it removes collects in a tank you empty, visible proof of the moisture it is taking out of the air before that moisture can settle on cold walls and windows. In a damp flat the same machine earns its keep year round, not just on wash day.
Pairing an airer with a dehumidifier
The combination that works best for indoor drying is a heated or ordinary airer in a smallish room with the door shut and a dehumidifier running alongside it. The airer encourages evaporation, the dehumidifier whisks the resulting moisture out of the air so the clothes keep giving up water rather than reaching a soggy stalemate, and the closed room concentrates the effect. Two low-watt devices together still draw far less than a tumble dryer, so even running both for a few hours the total stays low, perhaps under a pound for a full load at example rates, while the room stays dry and the washing comes out fresh. For a flat with no outdoor space this pairing is often the cheapest reliable way to dry clothes through the wetter months.
The damp trap of drying indoors
A wet wash holds litres of water, and when it dries indoors that water has to go somewhere. Without ventilation or a dehumidifier it ends up on the coldest surfaces in the house, the windows and outside walls, where it feeds condensation and, in time, mould. That is the hidden cost of careless indoor drying: a cheaper energy bill paid for with a damp home. The fixes are simple. Crack a window or run an extractor fan in the room where clothes are drying, or let a dehumidifier do the same job by capturing the moisture directly. Slinging wet washing over radiators is tempting and cheapish, but it chills the radiator, makes the boiler work harder to heat the room and adds the same load of moisture to the air, so an airer next to a warm radiator beats draping clothes straight onto it.
Matching the method to your home
Which approach wins comes down to your space and your schedule. A house with a garden and a flexible routine should lean on the washing line whenever the weather allows and keep a cheap clothes horse for wet days. A flat with no outdoor space is the natural home for a heated airer and a dehumidifier working together, with the door shut and the moisture managed. Anyone who must have a load dry within the hour, for shift work or a sudden soaking, keeps a tumble dryer for those moments while drying everything else the cheaper way. Start with a hard spin every time, dry for free outdoors when you can, reach for the low-watt gadgets when you cannot, and save the dryer for the days nothing else will do.