WattwiseHome energy, made clear
CurrencyUSDChoose location

Start with your location

Regional settings

Currency for your estimateUSD — US dollarSet automatically from Choose location.

Your location gives the calculator sensible defaults. Only change an extra setting when it differs from your actual bill.

Not saved yet
Start calculatingSaved locally
Detailed comparison

Inverter AC vs fixed-speed AC running cost

Compare an inverter and fixed-speed air conditioner using realistic input power, runtime, compressor cycling, and the same tariff.

AC

Air conditioner

Estimated monthly cost$42.24211 kWh · 72% typical load
AC

Air conditioner

Estimated monthly cost$66.77334 kWh · 72% typical load

At these inputs, Air conditioner costs approximately $24.53 less per month.

This is an operating-cost comparison, not a statement of equivalent comfort, capacity, cooking result, or product quality.
Interpret the result

What makes this a fair comparison?

Set the inverter side to its average input during a representative session. For the fixed-speed side, use rated input and a realistic compressor on-time. Product labels alone cannot predict weather, insulation, room size, or thermostat behavior.

A calculation you can check

Imagine an inverter averaging 1.2 kW for five equivalent full-power hours: it uses 6.0 kWh. A fixed-speed unit drawing 1.9 kW while its compressor is on for 3.2 hours uses 6.08 kWh. These illustrative sessions are nearly equal even though their instantaneous inputs differ. Enter measured session energy or realistic on-time for each side instead of assuming the lower printed wattage always wins.

Before trusting the difference

  • Use air conditioners sized for the same room and comparable cooling output.
  • Compare the same outdoor conditions, thermostat setting and number of hours.
  • Include purchase and maintenance costs only in a separate replacement decision.

Wattwise reports energy and operating cost only. Purchase price, capacity, comfort, maintenance, expected life, and repairability belong in a replacement-payback scenario.