The true cost of each option
The surface comparison is simple: airer costs £0 to run, dryer costs money. But the full picture is more nuanced.
Airer costs:
- Purchase price: £10-30 for a standard folding airer, £40-80 for a heated airer.
- Electricity: £0 (unheated airer). A heated airer uses 200-400W, around 4-8p per hour.
- Time: 30-60 minutes to hang a load, compared to 5-10 minutes to load a tumble dryer.
- Drying time: 4-12 hours indoors, longer in winter. Outdoors in summer: 2-4 hours in good conditions.
- Space: a full-size airer takes up significant floor space, often for 8-24 hours per load.
Tumble dryer costs:
- Purchase price: £250-600+ depending on type.
- Electricity: 10p per cycle overnight on Agile (2.5kWh condenser at 4p/kWh). Up to 95p at peak Agile rates.
- Time: 5-10 minutes to load, 60-90 minutes to complete. No hanging required.
- Drying time: 60-90 minutes regardless of weather or season.
- Space: the machine footprint only, no floor space consumed during drying.
On pure electricity cost, the airer wins, but by 10p per load overnight on Agile. Over a year of 4 loads per week, that is £20. The monetary difference between airer and overnight-timed dryer is smaller than most people expect.
Clothes airer: the hidden costs (time, space, damp risk)
The airer has real advantages. It is free to run, gentle on clothes, and requires no machine to maintain. But three hidden costs often go uncounted.
Time cost. Hanging a full laundry load on an airer takes 20-40 minutes. Loading a tumble dryer takes under 5 minutes. For a household doing 4 loads per week, the airer requires an extra 60-140 minutes of active time weekly. Over a year, that is 52-122 hours. That time has value, even if it is not financial.
Space cost. A full-size folding airer occupies roughly 1.5 square metres of floor space and must stay there for hours. In a small flat or house with limited living space, this is not trivial. The tumble dryer's footprint is fixed and enclosed. It does not colonise the living room.
Damp and mould risk. Drying clothes indoors releases significant moisture into the air. A typical laundry load contains 2-4 litres of water. In poorly ventilated UK homes, that moisture raises indoor humidity, promotes mould growth, and can aggravate respiratory conditions. The NHS and UK housing charities both highlight indoor drying as a contributing factor to damp problems in UK homes. If your property already has damp issues, the airer may not be the low-cost option it appears, once you factor in the long-term cost of mould treatment or health impacts.
Tumble dryer overnight on Agile: the real cost vs convenience value
On Octopus Agile with overnight timing, a condenser dryer cycle costs 10p. A heat pump dryer cycle costs 4p. At 4 loads per week, the annual cost is £20 for a condenser and £8 for a heat pump.
Against that cost, consider the convenience value:
- No damp added to the house overnight.
- Clothes ready by morning, not the next evening.
- 30-50 minutes of active time saved per load (no hanging).
- No dependency on weather for outdoor drying.
- Towels and bedding come out soft rather than stiff.
If you check AgileAlert each evening and set the delay start, the marginal cost of using the dryer instead of the airer is around 10p per load. For most households, the convenience value of a dry, soft load ready by morning exceeds 10p.
The relevant comparison is not "free airer vs expensive dryer." It is "free airer vs 10p overnight dryer." Framed correctly, the decision is much closer to neutral on cost and clearly in favour of the dryer on convenience.
The hybrid approach: airer for most, dryer for urgent needs
The financially optimal approach for most households is hybrid use:
Use the airer for: lightweight summer clothing, towels when there is time, clothes that do not need to be ready urgently, items that need flat drying rather than tumbling.
Use the tumble dryer overnight on Agile for: school uniforms and work clothes needed the next morning, towels and bedding when the airer is already full, heavy cotton that would take 24+ hours on an airer in autumn or winter, anything where the damp from indoor airing would be a problem.
This hybrid approach captures the zero cost of the airer for appropriate loads while using the dryer's speed and convenience for time-sensitive ones, and always at the overnight rate by setting a delay start.
The full guide to setting delay start on your specific dryer brand is at How to Use Delay Start on Your Tumble Dryer: All Brands Guide.
Dehumidifier plus airer: the middle option
Some households use a dehumidifier alongside an indoor airer. The dehumidifier pulls the released moisture from the air, preventing damp problems while the airer handles the actual evaporation.
The running cost: a typical 12-litre dehumidifier uses 200-300W, costing 8-12p per hour on a standard tariff, or around 1p per hour on overnight Agile. Running it for 8 hours overnight alongside drying clothes costs approximately 8-10p, comparable to running the tumble dryer itself overnight.
The dehumidifier-plus-airer approach has merit in homes with damp or mould problems where the airer alone would worsen conditions. It does not save money over the overnight-timed dryer at Agile rates. The main benefit is the option to use it in homes where a tumble dryer is not practical (rented flats, very small spaces).
If you have both options available, the tumble dryer at overnight Agile rates remains the most time-efficient and comparably priced solution. Use AgileAlert to find tonight's rate and the 10p per cycle becomes routine, not a decision.