Heatwave 2026 : how your household appliances are driving up the electricity bill

The 2026 heatwave does not only affect our comfort: it also drives up the electricity bill. The reason is household appliances running at full capacity to compensate for the heat, from the fridge to the air conditioner. Good news: a few simple habits are enough to limit the damage, without changing appliances.

Why heat makes your appliances consume more

Cold appliances (refrigerator and freezer) alone account for nearly 25% of a home’s annual electricity consumption, according to ADEME. A separate refrigerator + freezer pair often exceeds 500 kWh per year, or about €100 just to keep food chilled. When room temperature rises, the motor works harder to maintain the cold: the overconsumption is mechanical.

Air conditioning, meanwhile, operates on a different scale. In households equipped with it, electricity consumption jumped by 31% on the hottest days at the end of June 2026. At the national level, RTE estimates that each additional degree adds between 700 and 1,100 MW of load on the grid.

The grid holds, but your bill does not

Should we fear a massive blackout? No. RTE, the electricity transmission system operator, indicates that supply security does not call for any particular vigilance: available production means are considered to be in surplus. At the peak on June 22, 2026, the anticipated peak reached 57 GW, below the record 60 GW on July 1, 2025.

The real issue is therefore individual: it is your bill that swells, not the grid that fails. An air conditioner left on all night, an old spare freezer in the garage (up to around €150 per year on its own) or appliances left on standby weigh heavily on the summer bill. To dig deeper into these expense items, see our Electricity, Gas & Energy section.

Habits that lighten the bill

• Set the cold correctly: 3 to 5 °C for the refrigerator, -18 °C for the freezer. No need to go lower.
• Defrost regularly: half a centimetre of frost can mean up to 30% more consumption.
• Keep appliances away from heat sources (oven, sunny window) and allow air to circulate behind the refrigerator.
• Keep the freezer well filled: frozen bottles of water help stabilize the cold and reduce motor use.
• If you have air conditioning, aim for 26 °C rather than 20, and turn it off at night when the outside air cools down.
• Unplug devices on standby: they generate heat and consume power for nothing.

These actions are common sense, but their combined effect is real on a summer bill. Find more everyday tips in our Tips & Tricks, DIY and Practical Life & Society sections.

Frequently Asked Questions

Does a refrigerator really consume more in summer?

Yes. The hotter the room, the more the compressor has to run to maintain the internal temperature. During a heatwave, a poorly set appliance or one covered in frost can see its consumption rise significantly.

Could air conditioning cause blackouts in France?

According to RTE, no: electricity supply did not require any particular vigilance during the 2026 heat episodes, with demand remaining below the record peak of July 2025. The risk is mainly financial for households.

What air conditioner setting limits the bill?

A 5 to 7 °C difference from outside is enough to feel comfortable. Setting the air conditioner to around 26 °C, rather than 20 °C, greatly reduces consumption while keeping the home comfortable.

Sources

• ADEME — Consumption of household appliances
• RTE — Heatwave and security of electricity supply
• Hellowatt — Impact of air conditioning on the bill