The first summer bill after turning on the air conditioner often causes concern. The electricity cost rises, and you wonder how much that cool air is really costing you. The truth is that the split unit does have an impact, but much less than you might think, and above all, you can control the expense with simple choices. Let’s put some concrete numbers down and see where the waste hides.
How much it really consumes in an hour
An average single-split air conditioner for a room draws between 800 and 1,000 watts when running at full capacity. But it doesn’t always run at full power: once the temperature is reached, an inverter model modulates and drops to 300 or 400 watts to maintain it. In practice, during an hour of actual use, you often consume around 0.5 to 0.7 kWh. With energy prices fluctuating around 0.25 to 0.30 euros per kWh, that’s about 15 to 20 cents per hour. Running it for eight hours costs around one and a half euros.
What really drives the bill up
- Too low temperature. Every degree lower increases consumption by about 5 to 7 percent. Dropping from 26 to 22 degrees can raise the cost by a quarter.
- Dirty filters. When clogged, they make the unit work harder and consume more for the same cooling effect.
- Old unit. A low energy class model can consume twice as much as an A+++ class unit for the same result.
- Leaky house. Shutters open to the sun, wide-open doors, and old window frames waste half the work of the split unit.
Tips to lower the cost
The most effective is to keep the temperature between 25 and 26 degrees: the body feels great and you consume much less than at 22. Then close shutters and curtains during the hottest hours, because a shaded room cools with half the effort. Use the dehumidification mode on muggy but not scorching days: it removes the humidity that makes the heat feel sticky and costs less than full cooling. Finally, clean the filters every two or three weeks; it’s free and immediately restores efficiency.
Inverter vs. on-off, the difference in euros
If you have an old on-off model, know that part of your bill is wasted. Those air conditioners turn on at full power, reach the temperature, turn off, and then restart suddenly: each restart is a surge in consumption. The inverter, instead, modulates power and keeps the room constant without spikes. Over a summer of regular use, the difference between an old on-off and a good A+++ inverter can be 30 to 40 percent less electricity.
When it’s worth changing the unit
If your split is over ten years old, is on-off, and has a low energy rating, it’s probably costing you more every summer than you realize. Do a quick calculation: if you use it many hours, a new efficient model pays back the difference in consumption in two or three seasons and also gives you more quiet and comfort. In our air conditioners section you’ll find high-class inverter models with declared annual consumption, so you can compare the numbers before choosing.
Frequently Asked Questions
How much does it cost to keep the air conditioner on all day?
An average single-split inverter costs about 15 to 20 cents per hour of actual use. Running it for eight hours costs around one and a half euros, twelve hours about two and a half euros, depending on the set temperature and the tariff.
Is it better to turn the air conditioner off and on again or leave it on?
With an inverter, it’s better to leave it on at a constant temperature for medium to long periods, because modulating costs less than restarting from zero each time. If you’re going out for many hours, however, it’s better to turn it off completely.
Does the dehumidification mode consume less than cooling?
Often yes, because it works with less intensity on the compressor. On muggy but not boiling hot days, it removes the humidity that makes the heat feel sticky and makes you feel comfortable at a higher temperature, thus consuming less.