Why are home cooling costs suddenly a talking point?
Home cooling costs are climbing because 2026 has brought some of the hottest weeks on record in the UK, and a lot of households are reaching for a fan, a portable air conditioning unit, or both. More demand for cooling means more electricity used, right at the point the price cap has already pushed bills up for the quarter.
National Grid has issued electricity supply warnings on the hottest days this summer, partly because evening demand still peaks just as solar output drops off. None of that means your own bill has to spiral. It mostly comes down to which cooling method you reach for, and how you use it.
There’s a decent chunk of good news buried in here too. The UK’s rooftop solar has been soaking up a lot of that daytime demand surge, occasionally pushing wholesale prices down during the sunniest hours. Home cooling costs during the day, when solar is doing the heavy lifting, aren’t necessarily the expensive part. It’s the evening, once the sun’s gone and the fans and AC units are still running, that tends to bite hardest.
How much do home cooling costs actually add to your bill?
A standard desk or pedestal fan is cheap to run, typically costing somewhere around 1 to 2 pence an hour at current unit rates. Leave two or three running across a hot week and you’re still only looking at a few pounds added to the bill.
Portable air conditioning units are a different story. Depending on the size and how long it runs, a portable AC unit can cost roughly 10 to 20 times more per hour than a fan. Run one most of the day during a heatwave and it can noticeably move your weekly usage, especially layered on top of an already higher unit rate this quarter.
Home cooling costs: rough hourly comparison
- Pedestal or desk fan: around 1 to 2p an hour.
- Tower fan: broadly similar to a pedestal fan.
- Portable air conditioning unit: considerably more per hour, varies by model and size.
- Ceiling fan: usually cheaper to run than a portable AC unit, and cools a room faster than a small desk fan.
Figures are rough estimates at current unit rates and will vary by appliance and your own tariff.
What’s the easiest way to cut home cooling costs?
Close curtains or blinds on the sunniest side of the house during the day. It sounds basic, but keeping direct sun out in the first place does more than almost any appliance running after the room has already heated up. Open windows in the early morning and late evening instead, when the air outside is actually cooler than indoors.
A fan pointed at you, rather than left to cool an entire room, does most of the job for a fraction of the running cost of air conditioning. If you do use a portable AC unit, closing the door of the room it’s in stops it working overtime to cool the whole house.
If home cooling costs are adding to a bill that already feels high, it’s worth checking your tariff itself isn’t part of the problem. Our average energy bill guide shows what a typical household pays this year, and our piece on standing charges explains the fixed part of your bill that a fan or AC unit can’t touch either way.
Does running appliances at certain times reduce home cooling costs?
A little, yes, if you’re on a tariff with time of use pricing. Evening demand tends to be highest exactly when people get home and put a fan or AC unit on, so unit rates can be higher during that window on some tariffs. Running a fan through the afternoon rather than waiting until 7pm can work out marginally cheaper on those deals, though it won’t transform your bill on its own.
The bigger lever is almost always the tariff itself rather than the exact hour you flick a switch. A fixed deal that suits your usage pattern will usually save more over a summer than shuffling when the fan goes on.
None of this is about telling anyone to sit in a hot house and tough it out. Staying cool safely matters, especially for older people, small children and anyone with a health condition. The point is just that there’s usually a cheaper way to get there than reaching straight for the most powerful appliance in the house.
Frequently asked questions about home cooling costs
- Is a fan really cheaper than air conditioning?
- Yes, considerably. A fan typically costs a penny or two an hour to run, while a portable air conditioning unit costs noticeably more per hour depending on its size and how efficiently it’s used.
- Will a heatwave push my electricity bill up a lot?
- It can add to it, especially if you’re running air conditioning for long stretches, but for most households a heatwave adds a modest amount rather than a shock increase, particularly if you lean on fans and shading first.
- Do ceiling fans cost more to run than portable fans?
- No, ceiling fans are generally efficient and often cool a room faster because they move more air, for a similar or lower running cost than a portable fan.
- Does closing curtains actually make a difference to home cooling costs?
- Yes. Keeping direct sunlight out during the hottest part of the day reduces how much a room heats up in the first place, which means less work for any fan or AC unit later.
- Is now a bad time to switch energy supplier because of the heatwave?
- Not particularly. Switching or fixing your tariff is unrelated to short term weather, and a competitive fixed deal can help offset higher summer usage either way.
Home cooling costs are one of those bills that spike for a fortnight and then get forgotten about until the next heatwave. Sorting the tariff underneath it is the bit that keeps paying off long after the fan gets put away.
