TNB Electricity Bill Simulator: calculate how much your air conditioning really costs

TNB Electricity Bill Simulator: to understand the real cost of an air conditioner, you must look beyond the stated power rating. The final price depends on the type of appliance, hours of use, electricity tariff, and how well the room retains coolness. In 2026, the difference between a portable model and a split inverter could amount to several tens of euros per month.

This guide explains how to use a calculator simple way to estimate your electricity bill to compare costs by type of air conditioning unit and identify actions that reduce energy consumption without compromising comfort. The goal is practical: understanding exactly how your air conditioning affects your budget, with real-life examples and useful benchmarks for your next summer.

In brief

• •A simulator allows you to estimate the cost of air conditioning based on power, usage time, and electricity rate.
• •A portable model often consumes significantly more than a fixed split unit, especially with daily use.
• •An inverter air conditioner adjusts its power and reduces energy consumption.
• •The set temperature, filter maintenance, and room insulation directly affect the bill.
• •Choosing the right air conditioning unit can save tens of euros during a hot month.

In a home poorly protected from heat, air conditioning can quickly become a noticeable expense on the bill. For a household, the question isn’t just ‘does it cool?’ but ‘how much does it cost per day of use?’ In 2026, with rates varying by contract and more frequent heatwaves, making the right calculation becomes a useful habit.

The principle remains simple, even if brands and technologies sometimes complicate the marketing message. High power doesn’t always mean skyrocketing costs, and a more expensive unit upfront may cost less to run. That’s where a consumption simulator comes in handy: it helps turn comfort into a clear, understandable figure.

For example, take Lina, who lives in a 25 m² apartment and uses her air conditioner for several hours a day. She first considers the purchase price, then realises the real issue is daily operation. That’s the game-changer: a poorly performing unit can cost a fortune all summer, even if it seemed budget-friendly at first.

01TNB electricity bill simulator: how to calculate air conditioning costs

The basic calculation is straightforward: multiply the power in kilowatts by the number of hours of use, then by the price per kilowatt-hour. This logic applies to all models, whether it’s a portable monobloc, a wall-mounted split system, or a reversible unit. The TNB simulator uses this principle to provide a quick and easy estimate.

As of May 2026, the regulated EDF base rate for 6 kVA stands at €0.2016 per kWh excluding subscription. With this rate, a 2 kW unit used for 1 hour consumes 2 kWh, costing €0.4032. This figure seems small over an hour, but it adds up quickly with repeated use over several days.

Another key factor is your electricity contract. Some providers offer rates around 0.18 € per kWh, which cuts the bill, while a higher tariff immediately increases costs. The same appliance won’t cost the same across households, even with identical usage.

To keep it simple, here’s how to use a basic calculator:

• •Identify the power rating of your air conditioning unit in watts.
• •Convert to kilowatts if necessary.
• •Multiply by the number of daily hours.
• •Multiply by the number of days in the month.
• •Apply the kWh price indicated on the electricity bill.

This method provides a concrete estimate of the monthly cost. It also allows you to compare multiple units before buying, which is often more useful than just checking the energy label. The key is to think in terms of real usage, not just technical specs.

In practice, this calculation also helps anticipate seasonal variations. In July or August, air conditioning runs longer, sometimes at full capacity, driving up energy use. As soon as usage hours multiply, small differences in efficiency become noticeable on the bill.

A useful tip: if your appliance runs for 5 hours a day over 30 days, the entire month’s cost isn’t judged by the hour but by the full cycle. That’s exactly what the simulator highlights, converting daily usage into a concrete monthly figure. For the reader, this changes the buying decision and how temperature is set.

02Energy Consumption of Air Conditioning Based on Unit Type

Not all air conditioning units are equal. Portable models are often the most power-hungry, while modern fixed splits, especially in A+++ inverter versions, consume significantly less for the same level of comfort. This matters, as two machines cooling the same room can result in very different bills.

A mobile air conditioning unit often consumes between 1.5 and 2.5 kWh per hour. In contrast, a split A+++ model typically drops to around 0.5 kWh per hour thanks to its inverter technology, which adjusts power instead of running at full capacity. This modulation reduces energy consumption by 30 to 50% in many use cases.

Reversible models offer another advantage: their coefficient of performance, or COP, can reach around 4. In simple terms, this means they deliver roughly four times more thermal energy than they consume in electricity. For the reader, this translates to better-managed bills, especially if the same appliance also provides heating in winter.

Installed power plays a key role. A small room may get by with around 900 W, while a living room may sometimes require up to 3,500 W depending on its size and exposure. The greater the mismatch between the unit and the room, the harder the appliance works unnecessarily.

Energy class also helps with comparison. An A++ model can consume up to 58% less than a basic unit, a difference that becomes noticeable with regular use. The right choice isn’t just about comfort—it’s also about managing seasonal spending.

When looking at the figures over a full month, the difference becomes even clearer. An efficient split unit consumes very little energy at low load, whereas a standard mobile unit remains heavier on the bill, even when it seems convenient. The result is simple: the type of appliance already accounts for a large part of the summer budget.

This insight encourages looking at technology before purchase price. A cheap unit may cost more over time, while a more efficient model quickly offsets its higher upfront cost. This is often where the real economic decision lies.

03Real monthly cost of air conditioning: detailed examples and electricity bill breakdown

To calculate the monthly cost, you need to scale from hours to months. If an air conditioner runs for 5 hours a day over 30 days, the total consumption is easy to compute and gives a far clearer picture. This is where the simulator becomes truly useful for estimating bills before the season ends.

Take an A++ split system consuming 0.8 kWh per hour. Over 5 hours a day, that’s 4 kWh daily, or 120 kWh over 30 days. At the regulated rate of €0.2016 per kWh, this amounts to approximately €24.19 per month.

Using a mobile model changes the equation significantly. With 2 kWh per hour, this amounts to 300 kWh monthly, or €60.48. The difference is substantial enough to warrant consideration at the time of purchase, especially if air conditioning is used every summer.

Here’s another useful table to compare monthly costs:

In southern France, heavy usage can push costs to around €150 per month for a four-person household. Over a 90-day summer period, many households spend between €70 and €170, depending on habits, insulation, and the number of rooms cooled. This explains why small temperature differences quickly add up.

A family using their air conditioning for 6 hours a day over a month with a standard model could reach 1080 kWh if the unit is heavily used. This level clearly shows the difference between occasional and intensive use. The longer the machine runs, the more the cost becomes structural rather than incidental.

For readers, this calculation changes one key thing: the electricity bill is no longer a surprise but a manageable indicator. By understanding the link between duration, power, and electricity rates, you can adjust habits without sacrificing comfort.

04Energy savings with air conditioning: settings, maintenance, and good habits

Reducing your bill doesn’t necessarily mean replacing all your equipment. Often, a few adjustments can significantly improve energy efficiency. The most well-known tip is to aim for 26 °C instead of 18 °C, as each degree saved can cut costs by 5 to 10%.

This margin may seem modest, but it adds up every day. Keeping a room too cold forces the unit to run longer, while a more reasonable setting often achieves true comfort. The reader benefits from both savings and thermal stability.

Simple actions can have an immediate impact:

• •Close shutters and curtains during the hottest hours.
• •Clean the filters every month to maintain efficiency.
• •Choose the correct power rating based on the area to be cooled.
• •Avoid continuous operation when scheduling is sufficient.
• •Place the appliance in the most frequently used room rather than over-equipping the entire home.

Maintenance often has an underestimated impact. Clogged filters reduce airflow, forcing the unit to work harder for the same result. The cost rises, and comfort drops, proving that good energy savings also depend on upkeep.

Choosing a reversible model can also help throughout the year. With a SCOP above 4, winter heating remains efficient, making the investment more worthwhile for households looking for versatile equipment. In this case, air conditioning is no longer just a summer appliance but a broader thermal management tool.

To track spending trends, some households monitor their Linky meter almost in real time. This reading helps see the impact of an adjustment or a poorly insulated room on energy consumption. If your contract exceeds 0.20 € per kWh, switching providers can also make a noticeable difference over the year.

Another lever gaining traction in 2026 is pairing air conditioning with solar panels. When production covers part of daytime needs, the real cost drops and reliance on the grid reduces. It’s not an automatic solution, but it’s a concrete option for households exposed to extreme heat.

The key factor remains the same: it’s better to adjust multiple small parameters rather than rely on a single ‘miracle’ lever. Temperature, maintenance, insulation, and usage duration all work together, and it’s this combination that truly cuts costs.

05Use the TNB electricity bill simulator to compare and plan ahead

A good electricity bill simulator isn’t just for calculating a figure. It also helps compare different scenarios before buying, estimate the return on investment for a more efficient model, and avoid unpleasant surprises during heatwaves. This is especially useful when deciding between a mobile unit, a standard split, or a more efficient inverter model.

In a household, the difference between two units may seem negligible on the product sheet, but it becomes clear over an entire season. The simulator lets you input your own usage duration, electricity rate, and unit power to get a result closer to reality. For the reader, this changes the decision-making process: you buy smarter, set it up better, and spend less.

This type of tool is also practical for testing multiple scenarios:

• •reducing usage from 8 hours to 5 hours daily;
• •compare a rate of 0.2016 € and an offer at 0.18 € per kWh;
• •assessing the benefit of a split A+++ compared to a single mobile unit;
• •verify whether the property actually meets the advertised power specifications.

For households wanting to keep control of their spending, the calculator serves as a benchmark before and during the summer. It helps link thermal comfort to budget without unnecessary jargon. It’s a simple tool, but it makes visible what often stays unclear on an electricity bill.

The logic is the same for all: the more efficient, properly sized, and thoughtfully used the unit is, the lower the cost. In practice, the best results come from small gains added together, not a single magical setting. The TNB simulator provides exactly this clear breakdown, immediately useful for deciding, comparing, and prioritising.