Nearly 40 million UK households rely on electric fans during summer heatwaves. The question is not whether they work, they do, but what they cost on a bill already stretched by the highest electricity prices in Europe. A 50W pedestal fan running for 8 hours overnight uses 0.4 kWh. At the current price cap of 24.5p per kWh, that’s 9.8p per night. Over a typical seven-day heatwave, that’s 68.6p. Hardly a budget-breaker, but the arithmetic changes fast.
As reported by the Manchester Evening News, households running fans around the clock can see a noticeable jump. A 70W tower fan for 12 hours costs 20.6p a day, £1.44 a week. A 100W desk fan? 29.4p a day, over £2 for a week. Those sums sit on top of fridge-freezers, lighting and standby loads that already push a typical 3-bed semi’s daily electricity use to 8–10 kWh.
Who feels it most
The sting hits hardest in homes with no air conditioning, poor insulation, or upstairs bedrooms that turn into saunas by 10pm. Ofgem data shows that low-income households in the lowest EPC bands (D–G) spend a larger share of income on electricity. For them, an extra £2 a week matters. The Energy Saving Trust notes that fans are still five to ten times cheaper per hour than a portable air conditioning unit, which draws 1,000–1,500W and costs 24p–37p per hour. But the comparison is misleading: fans move air, they don’t cool it. On 35°C nights, they merely circulate hot air.
The catch is that many families buy fans in a panic, a 25°C day becomes 28°C, the supermarket sells out of 50W models, and they grab a 120W tower fan instead. That doubles the running cost. A 120W fan for 8 hours costs 23.5p per night, or £1.65 a week. Over a month of intermittent heatwaves, that’s £6–7 extra on the bill.
What the price cap means for fan users
The current price cap, set by Ofgem at £1,568 per year for a typical dual-fuel direct debit household, translates to 24.5p/kWh for electricity. That rate runs from July to September 2025. Network charges, standing charges, and VAT of 5% are all baked in. But the cap is a ceiling, not a floor. Some regional suppliers charge more, up to 27p/kWh in parts of the South West. A fan user there pays 10.8p per 8-hour session, not 9.8p.
The government’s Warm Home Discount and Winter Fuel Payment don’t cover summer cooling. No grant exists for fans. The only official advice from the NHS and UKHSA is to keep rooms shaded during the day, open windows at night, and use fans sparingly, which contradicts the lived reality of a sleepless family in a top-floor flat.
How to cut the cost without cutting the breeze
First, use a timer or smart plug. Running a fan from 11pm to 7am costs the same as 10pm to 6am, but the latter covers the hottest part of the night. Second, clean the blades and grille. A dusty fan moves 20–30% less air, so you may turn it higher, using more power. Third, place a bowl of ice water in front of the fan. The evaporative effect can drop perceived temperature by 2–3°C without extra electricity. Fourth, consider a ceiling fan. A 30W ceiling fan uses 60% less power than a 50W pedestal model and moves more air.
For homeowners thinking long-term, the real solution is fabric-first: external shutters, solar-control glazing, and loft insulation. The Energy Saving Trust estimates that good insulation keeps a home 3–5°C cooler in summer and warmer in winter. That’s a capital cost, but it pays back in both seasons. A loft insulation top-up (from 100mm to 270mm) costs around £300–400 and can reduce cooling load by 15–20%.
What to do now
Check your fan’s wattage, it’s printed on the base or plug. Multiply by hours used, divide by 1,000, then multiply by your unit rate (24.5p default). That’s your nightly cost. If it’s over 15p, consider swapping to a lower-wattage model or using a timer. If you’re on a prepayment meter, the unit rate is higher, typically 25.5p, so the same fan costs 10.2p per night. The difference is small per night but compounds over a summer. For those considering a portable AC unit, do the maths: 1,200W for 8 hours is 9.6 kWh, £2.35 a night. That’s £16.45 for a week. A fan is cheaper, but not a solution when indoor temperatures exceed 26°C. The only lasting fix is a cooler home, and that starts with insulation, not a plug.
Frequently Asked Questions
A typical 50W pedestal fan running for 8 hours costs about 9.8p per night at the current price cap rate of 24.5p/kWh. Larger fans (70–100W) cost 14p–20p per night. Using a timer or smart plug can reduce costs by limiting runtime.
Fans are much cheaper: a 50W fan costs 9.8p for 8 hours, while a 1,200W portable AC unit costs about £2.35 for the same period. However, fans only circulate air, they don't cool it. For extreme heat, a fan alone may not be enough.
