Air Conditioning · Updated August 2026
Portable Air Conditioning Cost UK 2026
A portable unit needs no installation and no installer — you buy it, wheel it in and vent the hose out of a window. That buys convenience at £200–£500, but it is the most expensive way to cool a room hour for hour.
Portable vs fitted — 2026
The purchase price is the whole story for a portable; for a split, running cost is.
| Option | Up-front | Running (per summer) | Rooms | Notes |
|---|---|---|---|---|
| Portable unit | £200–500 | £90–160 | 1 (partial) | Draws 1.0–1.5kW near-continuously; hose must vent out |
| 2.5kW fitted split | £1,500–2,600 | £30–70 | 1 | Quieter, cools properly, heats in winter |
| Difference | −£1,300–2,100 up front | +£60–90 every summer | — | A split repays the gap over roughly 15–25 summers on running cost alone |
Source: Best Builders 2026 quote data across 519 UK towns.
What changes the cost
| Cost factor | Typical impact | Why it matters |
|---|---|---|
| Pipe run length | +£150–400 | Runs over ~5m need extra refrigerant pipe, insulation and labour; long vertical runs in flats cost most |
| Condenser siting & access | +£100–600 | Ground level next to the room is cheapest; roof, height or scaffold access adds cost |
| Number of indoor units | +£700–1,500 each | Each extra head adds unit, pipework and commissioning time |
| Electrical work | +£150–500 | A dedicated spur, consumer-unit way or isolator may be needed |
| Capacity (kW / BTU) | +£200–1,200 | Oversizing wastes money up front and on running cost |
| Brand & range | +£400–800 | Premium Daikin/Mitsubishi designer ranges vs value Samsung/LG |
| Making good | +£0–300 | Trunking, core-drilling, plaster patching or repainting around the route |
Air conditioning cost by UK region — 2026
Labour rates and access drive most of the regional spread. Figures below are for a single-room split; the same percentages apply across the other system types.
| Region | Single-room split (installed) | vs UK average |
|---|---|---|
| London | £1,900–3,600 | +25–30% |
| South East | £1,750–3,300 | +15–25% |
| South West & East | £1,550–3,000 | +5–10% |
| Midlands | £1,450–2,800 | Baseline |
| North of England | £1,400–2,700 | −5% |
| Wales & Scotland | £1,400–2,750 | −5% to baseline |
Getting it priced properly
1. Size it first
Capacity comes from room size, glazing and aspect — not from guesswork. An installer who quotes without asking about the room is guessing.
2. Check F-Gas registration
Anything touching the refrigerant circuit legally requires an F-Gas registered engineer. Ask to see it and check it on the register.
3. Compare like for like
Get three itemised quotes covering the same capacity, brand tier and pipe run, so you are comparing the job and not the wording.
Portable units — frequently asked questions
For occasional or emergency cooling, in a rented flat, or where no external unit is allowed, they are the only realistic option. For a room you will cool every summer for years, a fitted split is quieter, cools better and costs far less to run.
A portable draws close to its full 1.0–1.5kW most of the time and vents warm air through a hose that also lets warm air back in around the window seal. A fitted split modulates down to 0.3–0.7kW once the room is at temperature.
For a portable, normally not — nothing is fixed and nothing is drilled. For anything with an external condenser you will need the landlord’s consent, and in a flat usually the freeholder’s too.
Some do, but poorly and expensively. If you want heating and cooling from one box, a reversible split is the system that actually does it.
Related air conditioning guides
Every system type priced side by side.
What it costs per hour and per summer.
When an external unit needs consent.
Reviewed by the BestBuilders editorial team on 9 August 2026 · Next scheduled review: November 2026 · See our editorial standards.