Inverter air conditioner

An inverter air conditioner varies its compressor speed continuously instead of switching on and off, holding temperature more precisely while using significantly less electricity.

Non-inverter units run flat-out until the room overshoots the target, stop, then start again, the constant restarting wastes energy and wears the compressor. Inverters throttle up and down smoothly, which is why they dominate the modern market and can use dramatically less power than pre-2010 units for the same cooling. Every unit worth quoting in Australia today is an inverter; the word on a spec sheet is table stakes, not a premium feature.