Running an air conditioner for an hour costs on average between €0,15 and €0,45, depending on the power of your unit and your energy tariff. A standard 2,5 kW monoblock air conditioner consumes approximately 2,5 kWh per hour, which amounts to €0,75 per hour at an average rate of €0,30 per kWh. However, modern air conditioners with inverter technology can be much more efficient and often consume 30-50% less energy.

Why do high energy costs cause unpleasant surprises on your bill?

Many people underestimate the actual cost of their air conditioner and end up with an energy bill at the end of the month that turns out to be much higher than expected. An air conditioner running all day can easily cost an extra €15 to €25 per day, which amounts to an extra €450 to €750 per month during hot periods. The problem becomes even greater if you have an older model without energy-saving features, as these can consume up to twice as much power as modern appliances. The solution lies in choosing an energy-efficient air conditioner with inverter technology and consciously using timer functions and temperature settings.

How does an incorrect temperature setting affect your monthly costs?

For every degree you set your air conditioner lower than necessary, your energy consumption increases by approximately 6-8%. This means that an air conditioner set to 20°C instead of 23°C can consume up to 20% more power, which can quickly cost an extra €50 to €100 per month with intensive use. Many people set their air conditioners much too cold because they think it cools faster, but this only leads to unnecessary energy waste. By setting your air conditioner to a comfortable 23-25°C and using fan functions for extra comfort, you can drastically reduce your energy costs without sacrificing comfort.

How much power does an air conditioner consume per hour?

The power consumption of an air conditioner varies significantly depending on the type and capacity of the unit. A compact 2,5 kW monoblock air conditioner consumes an average of 2,5 kWh per hour at full capacity, while a larger 5 kW model can use as much as 5 kWh per hour. Modern air conditioners with inverter technology automatically adjust their power to demand, meaning that in practice they often use only 50-70% of their maximum capacity.

The actual consumption depends on various factors:

Temperature difference: The greater the difference between the indoor and outdoor temperature, the harder the air conditioner has to work.
Home insulation: Well-insulated rooms retain coolness better, meaning the air conditioner needs to run less.
Size of the room: Larger spaces require more power to maintain temperature.
Sunlight incidence: Rooms with many windows and direct sunlight require more cooling.

How much does an hour of air conditioning use cost on your energy bill?

The hourly costs are directly related to your energy tariff and the power of your air conditioner. With current energy prices in 2026 averaging €0,30 per kWh, a standard 2,5 kW air conditioner costs approximately €0,75 per hour at full capacity. However, an energy-efficient inverter air conditioner often uses only 60% of this power, causing costs to drop to around €0,45 per hour.

Here is an overview of typical hourly costs:

Small air conditioner (1,5 kW): €0,25 – €0,45 per hour
Medium-sized air conditioner (2,5 kW): €0,45 – €0,75 per hour
Large air conditioner (5 kW): €0,90 – €1,50 per hour
Very large air conditioner (7 kW): €1,25 – €2,10 per hour

It is important to realize that these costs can add up if you leave the air conditioning running all day. An air conditioner running for 8 hours a day can easily cost €6 to €12 per day, which amounts to €180 to €360 per month during hot periods.

Which factors influence the cost of your air conditioning?

The cost of your air conditioner is determined by a combination of technical and usage factors. The energy label of your device plays a crucial role: an A+++ air conditioner consumes up to 60% less energy than a B-label model. The age of your air conditioner also makes a big difference, as older models often lack inverter technology and run constantly at full power.

The main cost factors are:

Air conditioner type: Monoblock air conditioners are generally more energy-efficient than portable units.
Maintenance: Dirty filters can increase energy consumption by 15-25%
Placement: An air conditioner in direct sunlight works much harder than a unit placed in the shade.
Usage pattern: Constantly switching on and off consumes more energy than maintaining a stable temperature.
Home insulation: Poorly insulated rooms allow cold air to escape, causing the air conditioner to work harder.

Your energy contract also affects the costs. Variable rates can be up to 50% higher during peak hours than during off-peak hours, so it pays to use your air conditioning mainly in the evenings and at night when rates are lower.

How can you lower your air conditioning costs?

There are several ways to lower your air conditioning costs without sacrificing comfort. The most effective method is optimizing your temperature setting: set your air conditioner to 23-25°C instead of extremely low temperatures. Every degree higher can reduce your energy costs by 6-8%.

Practical money-saving tips:

Use a timer: Program your air conditioner to turn on an hour before you get home.
Maintain regularly: Clean filters monthly and have your air conditioning checked annually.
Improve your insulation: Seal gaps and use sun blinds to keep heat out.
Combine with fans: Ceiling fans help distribute cold air better.
Close doors: Cool only the rooms you use
Use night mode: Many air conditioners have a sleep mode that saves 20-30% energy.

The time of day you use your air conditioner can also make a big difference. Try to use the air conditioner primarily during off-peak hours (usually in the evening and at night) when energy rates are lower. A smart thermostat can help you with this by automatically adjusting the temperature based on your daily routine.

How De Betonboorder helps with air conditioning installation

We specialize in the professional installation of monoblock air conditioners without an outdoor unit, allowing you to enjoy efficient cooling without the high energy costs of traditional systems. Our experienced professionals ensure expert installation involving drilling two 16 cm diameter holes through your wall, finished with steel grilles for a neat appearance.

What we do for you:

Energy-efficient installation: We work exclusively with Innova 2.0 monoblock air conditioners with inverter technology for optimal energy consumption.
Professional drilling technique: Use of water-cooled diamond core drills in concrete and dust extraction in stone walls
Condensation water drain: Optional extra drain at no extra cost, ideal for high humidity.
Neat finish: The workplace is always left tidy, with protection for walls and floors.

Would you like to know more about an energy-efficient air conditioning system? Then contact us. touch with Contact us for a no-obligation quote and advice on the most suitable model for your situation.

How much does it cost to have your air conditioning on for 1 hour?