Air conditioning units for the home
By Airva Editorial Team · Checked against published UK guidance · Updated
Search for air conditioning units for the home and the results are a muddle: £300 portables from the big retailers sit next to £2,000 installed systems, and nothing on the page explains that these are entirely different machines answering entirely different questions. This guide walks the full ladder — from the plug-in box on castors to the invisible ducted system — with indicative UK costs, what each is like to live with, and who each one actually suits.
Why the shopping results are so confusing
There are really two markets hiding behind one search. Retailers — Argos, Currys, Amazon and the rest — sell the plug-in end: portable units you buy in a box, wheel home and vent through a window. Everything above that on the ladder is a fixed system, sold with installation, because the refrigerant work involved is legally restricted to F-gas certified engineers [2] — you cannot buy a split system off a shelf and fit it yourself.
That is why the price gap looks so strange. You are not comparing a cheap unit with an expensive one; you are comparing an appliance with a small building project. Both are legitimate. The rest of this page explains which side of the line your situation falls on.
The full ladder of home air conditioning units
Portable (monobloc) units
A portable is a self-contained box: compressor, fan and heat exchangers all in one casing, with a flexible hose pushing hot exhaust air out through a window. Typical purchase prices run £250–£700, no installation needed, working the day it arrives.
The compromises are real, though. The compressor sits in the room with you, so portables are the loudest option on this page. Most are single-hose designs that pull warm replacement air back into the room, blunting their own cooling — the physics is unpacked in our portable vs fixed air conditioning comparison. Best for: renters, occasional use, and rooms you cool a few weeks a year. If this is your end of the ladder, our portable unit buying guide covers how to choose well.
Through-wall and window units
Common in the United States, rare in the UK. A window unit sits in a sash opening; a through-wall unit sits in a sleeve cored through the masonry. British window styles rarely accept them, few UK retailers stock them, and a through-wall sleeve is a permanent hole that still houses a compressor at the building line. For UK homes they occupy an awkward middle: nearly the disruption of a fixed system with much of the noise of a portable. Most installers will steer you past them, and so will we.
Fixed wall-mounted split systems
The default answer for a UK home. A split system puts a slim, quiet wall-mounted indoor unit high on the wall and a condenser outside, joined by slim refrigerant pipes through one cored hole. A single room typically costs £1,800–£3,000 fully installed.
Running characteristics are where the money shows. The compressor lives outdoors, so indoor noise drops to a fan hum. Inverter control throttles the output down once the room reaches temperature instead of cycling hard. And almost every modern unit is reversible — it heats in winter as well as cooling in summer, working as an air-to-air heat pump. Best for: any room you use daily through summer, especially bedrooms.
Multi-split systems
Several rooms, one outdoor unit. A multi-split runs two to five indoor units from a single condenser, each room with its own temperature setting. Indicatively £3,500–£6,500 installed for a two-to-three-room home system, depending on capacities and pipe runs. Best for: whole-upstairs cooling, or homes where a second condenser would be unsightly or hard to site.
Floor console units
The indoor unit sits low on the wall like a slim radiator instead of high near the ceiling. Capacity and running behaviour match a wall-mounted split; expect a modest premium, around £2,000–£3,500 installed for a single room. Best for: lofts and rooms with sloping ceilings where there is no high wall, and anyone who prefers heat delivered at floor level in winter.
Concealed ducted systems
The invisible option. The unit hides in a ceiling void or bulkhead and breathes through discreet grilles — no visible box in any room. Ducted systems start around £6,000–£12,000+ depending on how many rooms are served and how much building work the ductwork needs. Best for: renovations and extensions where the ceiling is already open, and larger homes where aesthetics justify the premium.
Home air conditioning units compared
| Unit type | Indicative cost | Indoor noise | Heats too? | Best for |
|---|---|---|---|---|
| Portable (monobloc) | £250–£700 purchase | High — compressor in the room | Some models | Renters, occasional use |
| Through-wall / window | Rarely sold in the UK | Moderate–high | Rarely | Seldom the right UK answer |
| Wall-mounted split | £1,800–£3,000 installed | Low — fan only | Yes, almost all | One room, daily summer use |
| Multi-split | £3,500–£6,500 installed | Low | Yes | Two to five rooms |
| Floor console | £2,000–£3,500 installed | Low | Yes | Lofts, sloped ceilings |
| Concealed ducted | £6,000–£12,000+ installed | Very low | Yes | Renovations, whole-home |
Costs are indicative UK ranges; unit capacity, brand tier, pipe runs and access move every figure. The cost guide breaks down the variables.
When a £300 portable is genuinely the right answer
Honesty first: not every home needs a fixed system. A portable earns its keep when the need is short, shallow or temporary — a rented flat where you cannot drill the wall, a spare room used a dozen nights a year, a heatwave you just need to survive this month, or a trial run before committing to installation. For those cases, buy once, buy sensibly, and skip everything more expensive.
When a fitted unit repays the difference
The running costs guide sets out what each system type costs to run and why inverter splits hold an advantage the spec sheets understate. Energy Saving Trust guidance makes the broader point that keeping heat out — shading, ventilation at night — reduces how hard any cooling system has to work [3].
How to choose: three questions
- How many weeks a year will you cool this room? Under six: portable end of the ladder. More: fixed system.
- How many rooms? One room points to a single split; two or more usually point to a multi-split rather than duplicate condensers.
- What capacity does the room need? Floor area alone is not enough — glazing, orientation and ceiling height move the figure. The room size guide explains how capacity is set, and an installer confirms it with a heat-load survey.
Home air conditioning units FAQ
What type of air conditioning unit is best for a house? For most UK homes, a wall-mounted reversible split system — quiet, efficient, and able to heat as well as cool. Portables suit occasional or rental use; ducted suits renovations with the budget for invisibility.
Can I install a fixed air conditioning unit myself? No. The refrigerant work on split systems is legally restricted to F-gas certified engineers [2]. Only portable units are a genuine DIY purchase.
How much does a home air conditioning unit cost in the UK? Portables cost roughly £250–£700 to buy. A single fixed wall-mounted room system typically costs £1,800–£3,000 installed; multi-room and ducted systems range from about £3,500 to £12,000 or more.
Do home air conditioning units heat as well? Almost all modern fixed units are reversible air-to-air heat pumps that heat efficiently in winter. Some portables offer a heating mode, but with none of the efficiency advantage.
Which unit is quietest? Concealed ducted is quietest, then wall-mounted and floor-console splits — all keep the compressor outdoors. Portables are the loudest because the compressor sits in the room.
Get matched to the right unit
The unit type is the first decision; sizing, positioning and installer quality decide whether you love the result. Start with the system finder to narrow the type, then request an installer match to have it surveyed and quoted properly.