The UK is currently experiencing a sweltering heatwave, but if you're tempted to leave a fan on overnight, you might want to think twice.
This is because it could cause your energy bills to skyrocket, and let's face it, most of us are already feeling the pinch in that department thanks to the cost of living crisis!
The warning has been issued by Uswitch, who report that a 120w fan costs around 3.4p an hour to run.
Now, on the surface, this isn't much money, but if you leave it on overnight, that's 33p in extra electricity which equates to an extra £2.35 a week.
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With the cost of literally everything rising, the last thing many households need is an extra £10 added to their energy bills - and this is depended on a single 120w fan, so it could be a lot more.
But if you think that's expensive, definitely don't get a portable air conditioning unit, as they cost a whopping 28p an hour to run, which, as you can imagine, seriously adds up - especially overnight.
Thankfully, if you're looking to keep your energy bills as low as possible and stay cool in the heat, there are alternative solutions to cooling down at night.
For one, you could simply leave your window open, or you could try this 10-minute hack involving a lukewarm hot water bottle.
If you're looking to cut back on the pennies during the day, another handy tip is to simply keep your curtains shut and stop the heat from getting in!
With so many of us working from home these days, it's not a bad idea to have a spray bottle of water around too so that you can use it to cool yourself down further.
This warning about the cost of fans comes amid speculation that the hottest ever UK temperatures of 43C could be recorded this week.
However, the Met Office have said that this is 'unlikely', even if it is incredibly hot.
Becky Mitchell, a forecaster for the Met Office, told The Mirror: "It is quite unprecedented.
"There's a one in three chance we could see a record breaking temperature.
"The most likely outcome is we'll see temperatures in the mid 30s. There's a 30% probability we will get heat in the high 30s, which would break the UK's hottest temperature on record.
"Temperatures are likely to peak towards end of next week. There's lots different model outputs one or two are showing extreme temperatures like 43C.
"However, we are very unlikely to see 43C."
Topics: Life
Emma Guinness