Inverter vs Non-Inverter ACs: Long-Term Cost & Energy Breakdown
Inverter ACs cost more upfront but usually use noticeably less electricity, because the compressor slows down instead of switching on and off. If you run an AC for many hours a day through a long summer, the savings usually repay the higher price over a few seasons. For a guest room used occasionally, a non-inverter can still make sense.
Last reviewed: 27 October 2026
How they work
| Non-inverter (fixed speed) | Inverter (variable speed) | |
|---|---|---|
| Compressor | Full power or off | Adjusts speed to demand |
| Temperature | Swings around the set point | Steadier |
| Energy use | Higher in long use | Lower in long use |
| Upfront cost | Lower | Higher |
| Voltage tolerance | Often narrower | Often wider |
| Repairs | Simpler and cheaper | Control boards cost more |
Calculate your own running costs
We do not publish fixed savings figures because they depend on your tariff, hours of use and the specific models. Instead, use this method with the power ratings on the two ACs you are comparing.
- 1
Find average power (kW)
Use the rated cooling power input on the spec sheet or energy label. For inverter models, average consumption is typically lower than the maximum rating; use the brand's seasonal figure if published.
- 2
Multiply by hours
kW × hours per day × days per month = units (kWh) per month.
- 3
Apply your tariff
Multiply units by your per-unit rate, including taxes. Check your latest bill or your distribution company's tariff page.
- 4
Compare
Subtract the inverter's monthly cost from the non-inverter's to find monthly savings.
- 5
Payback period
Divide the price difference between the two ACs by monthly savings to find months to break even.
Example method (illustrative only)
If AC A averages 1.6 kW and AC B averages 1.0 kW, running 8 hours a day for 30 days uses 384 units vs 240 units: a difference of 144 units a month. Multiply that by your own tariff to see the saving. These wattages are examples, not figures for real models.
Slab effects
Electricity tariffs may be flat, tiered or time-of-use. Savings depend on when and how much you use an appliance. Use your provider's current schedule rather than assuming a single rate applies to every unit.
When to choose which
Choose inverter if…
- •You run the AC 6+ hours a day
- •You want to run on solar or UPS
- •Your supply voltage fluctuates
Best for: Main bedrooms and lounges
Non-inverter can make sense if…
- •Room is used occasionally
- •Budget is very tight
- •Local repairers are easier to find
Best for: Guest rooms, short summers
Frequently asked questions
Do inverter ACs really save electricity?
In most regular-use situations, yes, because they avoid repeated full-power starts and run at lower speed once the room is cool. Savings vary with use and model.
Can an inverter AC run on solar?
Many can run partly or fully on solar with a suitable inverter and battery setup. Ask a solar installer to size the system for the AC's wattage.
Ready to choose a size and model?
Read the AC buying guide