Every heatwave, the shops sell out of portable air conditioners. They have their place, but many people who buy one end up disappointed. Here's an honest comparison with a fitted split system, including when a portable unit really is the better choice.
How each one works
A portable air conditioner contains everything in one box on the floor. It pushes hot air out through a wide hose, which has to go through a window or door.
A fitted split system puts the noisy parts, the compressor and main fan, in an outdoor unit. A slim indoor unit sits high on the wall, and the two are connected by small refrigerant pipes through a single hole in the wall.
Side by side
| Portable | Fitted split system | |
|---|---|---|
| Cooling | Struggles in larger or sunny rooms, and many single-hose units pull warm air in from elsewhere | Sized to the room and holds a steady temperature |
| Noise indoors | Compressor is in the room, and many are loud enough to disturb sleep | Quieter indoors; manufacturers rate many at around 19 to 22 dB(A) on low |
| Efficiency | Generally lower, varies by model | Generally higher with inverter technology, varies by model |
| Heating | Usually none, or basic | Efficient heat pump heating |
| Security | Window or door left partly open for the hose | Windows closed and locked |
| Space | Takes up floor space, with a hose across the room | Wall-mounted, nothing on the floor |
| Installation | None, just plug it in | Must be installed by an appropriately F-Gas-certified business |
| Upfront cost | Low | Higher |
When a portable unit makes sense
- You rent and can't make changes to the building.
- You only need occasional cooling for a few days a year.
- It's a stopgap while you plan a proper installation.
When fitted is worth it
- You want to sleep properly through a heatwave. Quiet matters most in a bedroom.
- You work from home, or from a garden office, and need a steady temperature all day.
- You'd like efficient heating in spring and autumn as well.
- You plan to stay in the home for a few years. The efficiency and comfort are felt every summer.
Next step
If you're weighing up a fitted system, our costs guide explains what goes into the price and how to estimate running costs. When you're ready, send us an enquiry to discuss your options.