How the Calculation Works

The estimator uses the actual TNB domestic tariff tiers to calculate your monthly aircon electricity cost. Unlike a flat-rate estimate, this accounts for how TNB charges more per kWh as your total usage increases.

TNB Domestic Tariff Tiers (2024)

Monthly Usage	Rate (RM/kWh)
First 200 kWh	RM 0.218
201–300 kWh	RM 0.334
301–600 kWh	RM 0.516
601–900 kWh	RM 0.546
Above 900 kWh	RM 0.571

Source: TNB (Tenaga Nasional Berhad) domestic tariff schedule.

Inverter vs Non-Inverter — The Real Difference

A standard (non-inverter) compressor runs at full speed and switches on/off repeatedly to maintain temperature, drawing peak power each time it starts. An inverter compressor adjusts its speed continuously — using only as much electricity as needed to maintain the set temperature. This typically reduces energy consumption by 25–40% for the same cooling output.

For a 1.5 HP unit run 8 hours/day for 30 days, the difference is roughly RM 30–50 per month — RM 360–600 per year. Over 10 years, the inverter premium pays back many times over.

Tips to Lower Your Aircon Bill

Chemical wash every 12–18 months: A dirty evaporator coil forces the compressor to work harder, increasing electricity consumption by 15–25%.
Set to 24–26°C: Each degree lower increases energy use by approximately 8%.
Use timer mode: Pre-cool the room before sleep rather than running all night.
Check for refrigerant leaks: Low refrigerant means the system runs longer to reach temperature.

Aircon Energy Cost Estimator