Inverter vs non-inverter air conditioner: what’s the difference?
The key difference is how the compressor runs. A non-inverter (fixed-speed) aircon’s compressor switches fully on and off to hold the temperature. An inverter aircon varies its compressor speed, ramping down once the room reaches the set temperature instead of switching off. That single difference affects your electricity bill, comfort, noise and price — here’s how to choose.
Quick comparison
| Feature | Inverter | Non-inverter |
|---|---|---|
| Energy use | Up to 30–40% less | Higher |
| Running cost | Lower | Higher |
| Temperature stability | Very stable | Fluctuates |
| Noise | Quieter | Louder on/off cycles |
| Upfront price | Higher | Lower |
| Best for | Daily / long use | Occasional use |
Why inverter aircons cost less to run
A fixed-speed unit hits the set temperature, switches off, lets the room drift, then switches back on at full power — and those hard restarts use a lot of electricity. An inverter simply slows down and idles to maintain the temperature, avoiding the power-hungry start-stop cycle. Over a hot Highveld summer of daily use, that can mean 30–40% lower running costs.
When a non-inverter still makes sense
Inverters aren’t always the answer. A non-inverter unit costs less upfront and can be the better buy if you only run the aircon occasionally — for a guest room, a holiday home, or a space you cool a few times a month. If you run it daily, the inverter’s running-cost savings quickly outweigh its higher purchase price.
Which should you buy?
- Choose an inverter if you’ll use the aircon regularly, want lower electricity bills, quieter operation and stable temperatures.
- Choose a non-inverter if budget is tight and use will be light or occasional.
Most modern homes are best served by an inverter — which is why nearly all the units we install are inverter models.
Not sure which unit fits your home?
Van Biljoens has supplied and installed air conditioners across Pretoria since 1956. We will recommend the right inverter (or non-inverter) for your space and budget. Request a free quote or call 012 330 0421.
Frequently asked questions
Is an inverter aircon worth it?
For regular use, yes — the 30–40% lower running cost usually pays back the higher purchase price within a couple of seasons, plus you get quieter, more stable cooling.
Do inverter air conditioners really save electricity?
Yes. By varying compressor speed instead of switching on and off at full power, inverters avoid the high energy spikes of fixed-speed units, typically using 30–40% less.
What is the disadvantage of an inverter aircon?
The main downside is a higher upfront price, and repairs to the inverter circuitry can cost more. For daily use the running-cost savings outweigh this.
How can I tell if my aircon is an inverter?
Check the model name or spec sheet — it will usually say “Inverter”. Inverter units also run continuously at low speed rather than clicking fully on and off.
Are all new air conditioners inverters?
No, but most modern split units are. Budget and occasional-use ranges still include fixed-speed (non-inverter) models.
