How much electricity does an air conditioner use in 2026? A realistic monthly bill

What affects electricity consumption?

The real running cost of an air conditioner is not a fixed number - it depends on several factors. Before deciding whether your unit consumes "a lot" or "a little", it helps to understand which ones matter most.

• Room size - a larger space needs more energy to cool or heat.
• Insulation - well-insulated rooms keep the temperature and the AC runs less.
• Orientation - south and west facing rooms heat up more in summer.
• Outdoor temperature - the bigger the difference between inside and outside, the more energy is used.
• Set temperature - every extra degree below or above a reasonable level increases consumption.
• Inverter or on/off - inverters modulate power smoothly and are usually more efficient.
• SCOP and SEER - higher values mean lower consumption for the same comfort.
• Proper installation and regular maintenance - bad installation and dirty filters silently waste energy.

The same unit may consume very differently in two different homes, exactly because of these factors.

How is the cost calculated?

The math is simple once you know how many kWh the unit consumes per day or per hour:

consumed kWh × price per kWh = price in EUR

For EVN residential customers, the end price of electricity in 2026 is approximately:

• day tariff: about EUR 0.15 / kWh, VAT and excise included;
• night tariff: about EUR 0.09 / kWh, VAT and excise included.

Prices are set by the regulator (KEVR) and are usually updated once a year on 1 July. Always check the current price on your invoice.

Example

If your air conditioner uses 5 kWh per day on the day tariff:

• 5 × EUR 0.15 = about EUR 0.75 per day;
• 30 days: about EUR 22 per month.

If part of the operation is at night (on the night tariff), the real bill can be even lower.

Typical scenarios

The values below are indicative - for an inverter unit in a reasonably insulated home, with a sensible set temperature.

A larger room, poor insulation or a low-efficiency unit can push these values higher.

Why is an inverter usually more efficient?

Old on/off air conditioners run in "full power on - off" cycles. When the room reaches the set temperature, the compressor stops completely, then starts again at maximum. This cycle consumes more energy and stresses the compressor.

An inverter air conditioner does not run at maximum all the time. It smoothly modulates power, keeps the temperature more stable and often consumes noticeably less than an old on/off unit doing the same job.

Additional benefits are quieter operation and a longer compressor life, because there are no harsh start/stop cycles.

What do SCOP and SEER mean?

• SCOP - seasonal efficiency for heating.
• SEER - seasonal efficiency for cooling.

A higher value means better efficiency and lower electricity consumption for the same comfort. For example, an air conditioner with SCOP 4.6 delivers about 4.6 times more heat energy than the electricity it consumes (under standard seasonal conditions).

When choosing an AC, do not look only at the purchase price - check SCOP and SEER. The difference in the electricity bill over the next 10 years is usually larger than the difference in the unit price.

How to lower the bill

• Do not set the temperature too low in summer - 24-26 °C is usually enough.
• Do not set the temperature too high in winter - 21-22 °C is a comfortable target.
• Clean the filters regularly, typically every 1-2 months in active use.
• Do an annual professional maintenance.
• Keep doors and windows closed while the AC is running.
• Use the right capacity for the room - neither too weak nor too oversized.
• Do not buy a unit that is too small for a large room - it will run constantly at full load.

When does an AC consume more than normal?

If your electricity bill is higher than usual for similar use, check for the following causes:

• dirty filters and heat exchangers;
• missed or delayed maintenance;
• incorrect installation (too long pipe runs, wrong gradients);
• low refrigerant level or a hidden leak;
• poor room insulation;
• too large temperature difference with the outside;
• an undersized unit for the room.

In most of these cases, proper maintenance or a technical inspection is enough to bring consumption back to normal.

Conclusion

The real cost of running an air conditioner is not fixed, but it can be estimated reasonably well. Knowing the kWh price, the model capacity and your room conditions, you can build a fairly accurate forecast of the monthly bill.

The biggest savings come from a suitable model with a high SCOP/SEER, inverter technology, a proper installation and regular maintenance. If you need a consultation about the right capacity for your room or help choosing the right model, the NessebarClima team is here for you.