Inverter vs Non-Inverter Portable Air Conditioners: Is It Worth Paying More?

When two portable air conditioners look alike but one costs £80 more, the difference is often an inverter. Here is what that means, what it doesn’t, and when it’s likely to pay off. The worked example is the Meaco Cirro range, where the 12000 BTU model has no inverter and the 14000 and 16000 (the Cirro+) do. We haven’t tested either, so the figures are Meaco’s.

What an inverter does

A non-inverter portable runs its compressor at one speed. When the room reaches the target temperature the compressor switches off; when the room warms up it switches back on at full power. An inverter compressor varies its speed. Once the room is near the target it slows down and keeps going, rather than stopping and starting. Meaco describes it as like cruise control in a car, adjusting output to hold your chosen temperature with only the energy needed.

What it doesn’t change

It doesn’t change the maximum power draw: Meaco’s figures put the 14000 inverter at 1550W in cooling mode against 1350W for the 12000 non-inverter, because it’s a bigger machine. It doesn’t change the basic problem with a portable, that the unit sits inside the room and has to push its heat out through a hose. And it doesn’t change the work needed to fit a window kit properly. The saving, if there is one, comes from steady running, not from anything at full power.

A worked example, with the caveats

At 26p a kWh (about what Meaco and Ideal Home both used), an eight-hour night of continuous full-power running would cost roughly £2.81 for the 12000 (1350W × 8 hours = 10.8kWh) and £3.22 for the 14000 (12.4kWh). So at full output the inverter model costs more, not less. Meaco says the Cirro+ range uses up to 35% less energy, based on overnight usage. If that applied to the 14000’s full-power figure, the most it could save is about £1.13 a night. In reality no unit runs at full power all night, so the real saving would be smaller, and the claim is Meaco’s own: we haven’t found an independent measurement of it. Whether an inverter model repays its higher price depends on how many hours a night you run it, and the evidence for the saving is thin, so we wouldn’t buy the Cirro+ on the energy argument alone.

When an inverter is likelier to be worth it

• You’ll run it for long stretches. Overnight cooling, or working from home in a room that gets hot all day, is where a unit that holds a steady temperature earns its keep. Short bursts to take the edge off a room give it less to save.
• You’re sensitive to the noise of the compressor starting up. There’s no independent measurement for the Cirro+ range yet, but the principle is sound.
• You’ll keep it for years. Meaco’s warranty is two years on parts and labour (extendable to five); a premium you recover slowly matters more if you might sell the unit or replace it soon.

When to save the money

If you only need to take the heat out of a bedroom for a few hours on the hottest nights, a non-inverter that fits the room is enough. Our 12000 vs 14000 vs 16000 comparison walks through which size suits which room, and the Cirro 12000 review and Cirro+ 14000 review have the specifics.

And if you can install a split system

Most modern split systems are inverters, and because the compressor sits outside, it is both quieter and cheaper to run than a portable. If you own your home or have permission to fit an outdoor unit, compare the two before committing; our portable vs split-system comparison and guide to finding an installer are the places to start. Our room-size calculator will tell you which type suits your room, and lets you enter your own electricity rate and hours of use to estimate running costs.