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How Much Does It Cost to Run a Air Purifier in the UK? (2026)
Air purifiers run continuously at 10 to 100 watts depending on fan speed and room size. On a low setting they cost little; on high around the clock they can match a fridge.
A typical air purifier (40 W) costs £0.010 per hour, or about £7.49 per month at 24 hours a day in United Kingdom. Average running cost
| Wattage | Per hour | Per day | Per month | Per year |
|---|---|---|---|---|
| Low (10 W) | £0.003 | £0.062 | £1.87 | £22.78 |
| Typical (40 W) | £0.010 | £0.25 | £7.49 | £91.10 |
| High (100 W) | £0.026 | £0.62 | £18.72 | £227.76 |
Formula: watts ÷ 1000 × hours × price per kWh. Typical use is 24 h/day ≈ 350 kWh per year.
In the UK, with electricity at £0.26 per kWh (source: Ofgem price cap 1 Jul–30 Sep 2026, 2026-07), a typical air purifier costs £0.010 per hour and about £91.10 per year at 24 hours a day. Each £1.00 of electricity buys roughly 96.2 hours of use.
How to lower the cost of running a air purifier
- Run on high only to clear a room, then drop to low or auto.
- Replace filters on schedule. A clogged filter makes the fan draw more for less air.
- Size the unit to the room. An oversized purifier on low beats a small one on high.
In standby it draws about 1 W, which adds roughly 9 kWh (£2.28) per year if it is never unplugged.
Frequently asked questions
How much does it cost to run an air purifier 24/7?
About 29 kWh a month at 40 watts. Pick your region above.
Do air purifiers use a lot of electricity?
Not per hour, but continuous use adds up. Auto mode helps.
Should I leave my air purifier on all the time?
Manufacturers say yes for consistent air quality. On low, the cost is small.
Cost by region
- United States (average)
- California
- Texas
- New York
- Florida
- Canada (average)
- United Kingdom
- Germany
- France
- Australia
- India