When temperatures don't drop in the evening, it's hard to get a good night's sleep without a refreshing breeze. Many people then leave their air conditioning running all night. But when the bill arrives, the question stings: how much does this nighttime comfort really cost? Spoiler alert: the bill can quickly add up… unless you know a few simple tricks!
Coolness that comes at a price… down to the kilowatt.
Air conditioning has become an almost indispensable comfort during periods of extreme heat. However, it's not without consequences for your electricity consumption. On average, a domestic air conditioner (wall-mounted split or portable monobloc) uses between 1.5 and 2.5 kWh per hour. This depends, of course, on the unit's power, the outside temperature, the insulation of your home, and even… the size of your bedroom.
A quick calculation? With an average price of €0.20 per kWh in 2025:
For 2 kWh, expect to pay around €0.40 per hour.
Over an 8-hour night, this rises to approximately €3.20.
And if you leave the air conditioning running 24/7? That can reach €9.60 per day, or nearly €70 per week!
Needless to say, over the course of a summer, the bill can quickly become quite unpleasant…
Smart air conditioning: consume less energy without suffocating the system
Fortunately, there are very simple ways to keep cool without breaking the bank:
Recent models with an A++ or A+++ energy label consume up to 40% less than older air conditioners.
