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Buying guide · 3 min read
Portable vs fitted air conditioning: which is best?
A portable unit costs less to buy, but a fitted split system is quieter, cheaper to run, cools properly and heats your home in winter. Here's the full comparison.
The quick answer
Fitted wins for anything but short-term use
- PortableCheap to buy, but noisy, costly to run and needs a window open.
- FittedHalf the running cost, whisper-quiet, cools properly and heats in winter.
- PickChoose portable only if you rent and can't make changes, or need cooling for a few days a year.
Side by side
Portable vs fitted air conditioning compared
| Feature | Portable air conditioner | Fitted split system |
|---|---|---|
| Upfront cost | From about £300 | From £2,000 fully fitted |
| Running cost (2.5kW) | About 26p to 39p an hour | About 11p to 21p an hour |
| Noise indoors | About 50 to 65dB, like a loud conversation | From about 19dB, quieter than a whisper |
| Cooling power | Struggles on hot days, often loses cool air through the hose | Cools the whole room quickly and evenly |
| Heating | Rarely, and inefficiently | Yes, an efficient heat pump |
| Space | Takes up floor space, needs a window kit | Off the floor, out of the way |
| Security | Window must stay partly open | Windows close and lock as normal |
| Installation | None, plug in | Needs an F-Gas certified installer |
| Lifespan | Usually a few summers | Typically 10 to 15 years with servicing |
Portable air conditioner
- Low upfront cost
- No installation needed
- Can move between rooms
- Loud, which disturbs sleep
- Expensive to run
- Window has to stay partly open
- Takes up floor space
Fitted split system
- Whisper-quiet, ideal for bedrooms
- About half the running cost
- Heats your home in winter too
- Wi-Fi control from your phone
- Adds a lasting feature to your home
- Higher upfront cost, with 0% finance available
FAQs
Portable vs fitted: your questions
Still unsure? Call us on 0330 043 7869, 7 days a week.
Is a portable air conditioner as good as a fitted one?
No. Portable units are less powerful for their size, noisier and more expensive to run. Hot air from the exhaust hose and gaps around the window kit also let heat back in.
Are portable air conditioners expensive to run?
Yes, compared with a fitted system. A typical portable uses around 1 to 1.5kW, about 26p to 39p an hour at the October 2026 price cap, which can be double a fitted split system.
Do I need a window for a portable air conditioner?
Yes. Portable units need to vent hot air outside through a hose, usually through a partly open window with a sealing kit.
Can I install a split air conditioner myself?
No. Connecting the refrigerant pipes of a split system must be done by an F-Gas certified engineer by law, even on pre-charged units.
When does a portable unit make sense?
If you rent and can't make changes, or you only need occasional cooling for a few days a year, a portable unit can be a short-term option.
Upgrade to quiet, efficient air conditioning
Prefer to talk? Call 0330 043 7869, 7 days a week.