Clever plug-in units like the Midea PortaSplit have changed the question. So here's an honest comparison from someone who fits the permanent kind — including the cases where a portable genuinely is the right buy.
The old "portable" was a noisy box with a fat hose that barely cooled. The new split-hose units are genuinely good. Pretending otherwise would be daft — so this page doesn't.
For years the choice was easy: a proper installed system cooled a room, and a portable just moved warm air around noisily. That's changed.
A new class of unit — led by the Midea PortaSplit — splits the noisy compressor out into a small outdoor part, connected by a pre-sealed hose that clicks together with no tools and no refrigerant handling. The result is much quieter, far more efficient, and needs no drilling and no F-Gas engineer. It's a real step forward, and if you've read about it and wondered whether it makes a fixed install pointless, that's a fair question. What hasn't changed is the physics: the heat still has to leave the room through your window, and that one fact drives most of what follows.
Here's my honest take, as someone who installs the permanent kind: for the right person, a portable is the sensible choice, and I'll tell you exactly who that is. But it hasn't replaced fixed air conditioning — it's carved out the bottom slice of the market, and there's a large group of people for whom a proper install is still clearly the better answer. Let's work out which group you're in.
No suspense, because a guide that makes you scroll to the bottom for a straight answer isn't honest. Here's where each one genuinely wins. I fit the fixed kind — so where a portable really is the better call, I say so plainly below.
The same seven questions people actually ask me, answered straight for both. Scroll the table sideways on a phone.
| What matters | Portable (e.g. PortaSplit) | Fixed installed split |
|---|---|---|
| Up-front cost | £300–£1,000 — cheaper | From £1,450 (no VAT) for one room |
| Windows | Must stay part-open for the exhaust hose | Stay shut — only a condenser outside |
| Noise | Good units ~39 dB; cheap ones much louder | Compressor is outside — near silent indoors |
| Cooling a whole home | One room only, per unit | Multi-split runs several rooms from one condenser |
| Floor space | A unit stands in the room + window kit | Invisible — up on the wall, out of the way |
| Adds value to the house | No — it's an appliance you take with you | Yes — a permanent home improvement |
| Running cost for the same cooling | Higher — the part-open window works against it the whole time | Lower — sealed room, compressor outside, more cooling per pound |
| Security | Window sits part-open while it runs — worth thinking about overnight or on the ground floor | Windows stay locked shut |
| Lifespan in daily use | A consumer appliance — a few years of heavy summers | 10–15+ years with servicing |
| Best for | Renters, one room, temporary need | Owners, daily use, whole home, long term |
Both are honest choices. The right one depends entirely on your situation — not on which is "better" in the abstract.
The one thing the adverts gloss over. Every portable — including the clever split-hose ones — still has to vent heat outside, so there's a hose to a window, a balcony or a windowsill. That means the window is part-open the whole time it runs. On a still summer night that's fine. But it lets road noise, insects and warm air back in, and it's the single biggest reason people who use a room every day end up ringing me to have it "done properly" — window shut, nothing on the floor, and the only thing outside a quiet box on the wall. If you'll only run it on the hottest handful of evenings, that trade-off doesn't matter. If it's your bedroom every night, it will — and there are two knock-ons the brochures skip entirely. One: a part-open window overnight, or on the ground floor, is a security decision as much as a comfort one. Two: the warm air drifting back in means the unit runs harder and longer for the same result, so the efficiency figure on the box — measured in a lab with the kit sealed — flatters what you'll get in a real bedroom in July.
The five-year view. Take the same bedroom, used daily each summer. The portable: cheaper on day one, dearer to run for the same cooling, lugged out and packed away every year, condensate to deal with, and after a few hard summers you're shopping again — with nothing added to the house. The fixed system: more on day one, cheaper per hour of cooling from then on, silent, invisible, serviced once a year, still going strong past year ten — and it's a feature when you sell. Over five years the "cheap" option and the "expensive" option quietly trade places. That's not spin; it's just what happens when you own something for longer than one summer.
Not all portables are equal — the gap between the best and the cheapest is enormous. Here's an honest rundown of the ones actually worth your money, and where they sit.
The unit that started this conversation. It splits the compressor into a small outdoor part connected by a tool-free, pre-sealed hose — so it's genuinely quiet (~39 dB) and efficient, far closer to a fixed split than any portable before it — though an installed system remains quieter, more efficient and invisible in the room. Around £700–£1,000.
A well-regarded UK name for conventional (single- and dual-hose) portables. Not split-type, but dependable, sensibly priced and well supported. A solid middle choice if the PortaSplit is more than you want to spend.
Both make competent mid-range portables you'll see widely stocked. De'Longhi (Pinguino range) is a long-standing name; EcoAir offers good spec for the money. Fine for occasional single-room use.
The £150–£250 no-name units flooding online marketplaces each summer. They technically "work", but a single hose creates negative pressure that pulls warm air in through every gap, so real-world cooling is weak and they're loud.
Worth sitting with before you buy: the best portable costs £700–£1,000. A permanent single-room installation starts at £1,450 with no VAT — quieter, invisible, windows shut, and it adds value to the house. If you own your home and you'll use it daily, that gap is smaller than it first looks.
Smith EcoFlow doesn't sell portables and earns nothing from these — this is just honest guidance so you don't waste money on a bad one.
Find yourself in one of these two columns. Most people know instantly which side they're on.
If that's you: buy the best one you can (see above), and enjoy your summer. No need to call me.
If that's you: that's exactly what I do, locally, from £1,450 with no VAT. Free survey, honest advice — and installation dates from September are booking now.
If you've read this and concluded you want it done properly — quiet, permanent, windows shut — that's exactly what I do. Local, honest, from £1,450 with no VAT. And if you're still not sure, call and I'll tell you straight which way to go — even if the answer is "buy a portable".
A portable can get you through this summer. A free survey now holds you an installation date from 7 September — so next summer is done properly. Father & son firm · CIPHE member · £2m public liability · No VAT to add.
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