Most UK energy advice points at winter, when the heating drives the bill. Summer is the quieter season, but it is also where the easy wins live, because nothing essential needs to run and the long daylight does a lot of work for free. The catch is that a few summer habits quietly cost money: a tumble dryer running on a hot day, a fridge labouring in a warm kitchen, or a portable air conditioner left on overnight. This checklist walks through what is genuinely worth doing in the warm months, with the real numbers behind each one.
The short answer. In summer your gas use falls away and most of your bill becomes standing charges plus a modest amount of electricity. The biggest savings come from cooling cheaply (a fan costs pennies a day, air conditioning pounds a day), keeping the fridge and freezer happy in the heat, and using free daylight to dry clothes and delay the lights. At 26.11p per kWh, a typical pedestal fan run for 8 hours costs around 10p, so cooling itself is rarely the problem.
What actually changes on your bill in summer
If you heat with gas, summer is the cheapest stretch of the year. The boiler is off for space heating, so your gas use drops to whatever hot water and cooking need. What remains is electricity plus two standing charges you pay every single day, hot or cold.
At the Ofgem cap for July to September 2026, the standing charges are 57.19p a day for electricity and 29.04p a day for gas. That is about £2.62 a week before you use a single unit. You cannot switch them off, but it is worth understanding why your summer bill never drops to zero. Our guide to standing charges covers your options, including whether a no-standing-charge tariff suits a low-use summer home.
The practical point: in summer, small electricity habits matter more in proportion, because there is no large heating cost to hide behind them. A tumble dryer or an always-on appliance is a bigger slice of a smaller pie.
Cool the house for pennies, not pounds
Cooling is where summer bills can go wrong, but only if you reach for the wrong tool. A fan moves air and helps sweat evaporate; it does not lower the room temperature, but it makes you feel several degrees cooler for a tiny running cost. Air conditioning actually removes heat, which is why it costs far more to run.
The table shows typical running costs at the current electricity rate. A fan is cheap enough to ignore; an air conditioner is something to use deliberately.
| Appliance | Typical power | Cost per hour | Cost for 8 hours |
|---|---|---|---|
| Desk or pedestal fan | 50 W | 1.3p | 10p |
| Ceiling fan | 30 W | 0.8p | 6p |
| Tower fan | 60 W | 1.6p | 13p |
| Portable air conditioner | 1,000 W | 26p | £2.09 |
| Evaporative cooler | 70 W | 1.8p | 15p |
At 26.11p per kWh, Ofgem cap July to September 2026. Power figures are typical; check your own appliance's label.
The cheap path first: close curtains and blinds on the sunny side during the day, open windows once the outside air is cooler than inside (usually late evening), and let a fan do the rest. Our guide to keeping cool without air con goes through this in detail, and if you are weighing a unit, portable air conditioner versus fan compares the two head to head. For the full running-cost breakdown, see fan running cost and air conditioning running cost.
Look after the fridge and freezer in the heat
The fridge and freezer are the appliances that work harder in summer, because the warmer the room, the more heat they have to pump out to stay cold. They run around the clock, so small inefficiencies add up over months.
- Keep the fridge away from the oven, the dishwasher and direct sunlight through a window. A hot environment forces longer compressor cycles.
- Leave a gap behind the unit so the coils can shed heat. Vacuum dust off the back coils once in the warm season.
- Do not overpack the fridge so air cannot circulate, but a full freezer actually holds the cold better between door openings.
- Let hot leftovers cool before they go in, and keep door openings short on hot days.
A typical fridge-freezer uses around 200 to 400 kWh a year, which is roughly £52 to £104 at the current rate. It will sit at the higher end if it is old or struggling in a hot kitchen. More on this in fridge freezer in hot weather and fridge freezer efficiency.
Use the free daylight and warm air
Summer hands you two free resources: long daylight and warm, often breezy air. Both replace things you would otherwise pay for.
- Dry clothes outside. A tumble dryer is one of the most expensive household appliances to run, costing roughly 40p to 80p per cycle depending on type. A washing line costs nothing. Over a summer of two or three loads a week, line drying instead of tumbling can save £20 or more. See drying clothes without a tumble dryer.
- Let daylight delay the lights. You will switch lights on far later. If any bulbs are still old halogens, summer is a cheap-impact time to swap to LED lighting, since an LED uses around a tenth of the power.
- Cook without the oven. A hot oven heats the whole kitchen, which then makes the fridge work harder and the room less comfortable. A microwave, air fryer or slow cooker uses less energy and adds less heat. Our comparison of oven, microwave and air fryer shows the difference.
If you have solar panels, summer is your peak generation season. Running the dishwasher, washing machine or an immersion heater during the middle of a sunny day uses your own free electricity rather than imported units. See solar panels in hot weather.
Catch the costs that hide in summer
A few things quietly creep up when the weather turns. Worth a quick check.
- Standby and always-on kit. Holiday season aside, devices left on standby draw power all summer. The full picture is in standby power.
- Dehumidifiers and pool or hot tub gear. A hot tub is one of the most expensive things you can run; warm-weather use does not make it cheap. See hot tub running cost.
- Hot water set too high. You need less hot water in summer, and a lower cylinder or boiler flow temperature wastes less. Hot water savings covers the safe settings.
- Going away. Before a holiday, turn off everything that does not need to stay on, but keep the fridge and freezer running unless you are emptying them. A holiday is a good moment to take a meter reading so any estimated bill is accurate.
It is also the right season to sort the slower jobs for next winter while the heating is off, such as draught proofing and topping up loft insulation. Doing them now means they are paying you back the moment the cold returns. Our winter energy checklist is the companion to this one.
The bottom line
Summer is the season where doing very little keeps the bill low. Heating is off, daylight is free, and the main job is to avoid the few habits that cost money: expensive cooling when a fan would do, a fridge fighting a hot kitchen, and a tumble dryer running while a washing line sits empty.
Cool with curtains, ventilation and a fan first, and treat air conditioning as a deliberate choice rather than a default. Keep the fridge and freezer breathing freely. Lean on daylight and warm air for drying and lighting. Then use the quiet months to prepare the insulation and draught jobs that will cut next winter's far larger bill. The cheapest unit of energy is always the one you do not need to use.