Window Air Conditioner Supply and Installation

Window air conditioners are a straightforward, cost-effective solution for cooling a single room. The unit sits in a window frame or a purpose-cut wall aperture, with the cooling coil facing inward and the condenser exhausting heat to the outside. They are well suited to individual rooms, small offices, and situations where a full split system is not required. We supply and install window AC units across London and Essex, with a free site visit before any work begins.

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Find the right air conditioning system for your space

Cost-Effective Single-Room Cooling

Self-Contained, No Outdoor Condenser Needed

Quick and Straightforward to Install

Window air conditioning unit installed in a London flat

Why Choose Lux Cooling for Window AC Installation?

  • Proper Installation, Not DIY: Window units need to be correctly fitted and sealed to perform efficiently and avoid condensation problems. We carry out all installations to the manufacturer specification with a clean, weatherproofed finish.
  • Wall Aperture Option: Where a window installation is not possible, we can cut an aperture in a suitable external wall. We assess the wall construction and advise on the best approach at the site visit.
  • Right Unit for the Room: We confirm the correct unit capacity for your room size and sun exposure before recommending a specific model, so you get a system that actually cools the space effectively.
  • Part of a Wider AC Service: We also carry out AC repairs and servicing and maintenance on all types of AC systems.
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Why choose us for your window air conditioner installation?

  • 20 Years of Experience

    We have installed and maintained AC systems for over 20 years in homes and businesses across London and Essex.

  • Free Survey and Quote

    We carry out a free site survey and provide a full written quote before any work is agreed. No call-out charges.

  • 1-Year Installation Warranty

    All our installations are backed by a 1-year warranty on workmanship.

  • Window and Wall Aperture Installations

    We install through window frames and can cut wall apertures where a window position is not suitable or available.

  • Correct Sizing Confirmed at Survey

    We confirm the right unit capacity for your room size and aspect before recommending a model, so the unit is not under or over-specified.

  • London and Essex Engineers

    Our engineers are based in Loughton and cover the whole of London and Essex, with fast response and local knowledge.

Window AC unit installed through an aperture in an office wall in Essex

Where Are Window Units Installed?

Window air conditioners are designed to cool a single room or enclosed space. They are self-contained, with the cooling and condensing components in one housing, and are ideal where:

  • Only one room needs cooling and a full split system is not warranted
  • Budget is the primary consideration and the room size is manageable
  • No external wall space is available for a split system outdoor condenser
  • A short-term or rental property solution is needed
  • Server rooms and equipment rooms with a single accessible wall or window

Window units are not suitable for rooms without a window or suitable external wall, and they are less efficient and less quiet than modern split systems for the same capacity. If you are unsure which type is right for your situation, we can advise during the site visit. See our full AC installation service or the London and Essex pages.

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Benefits of Window Air Conditioners

Window units offer a practical, self-contained cooling solution for single rooms where a full split system is not required or not possible. The main advantages are:

  • Lower upfront cost: Window units are significantly less expensive to purchase and install than a split or multi-split system, making them a practical choice for single rooms or budget-conscious situations.
  • Self-contained, no separate outdoor unit: The entire system is contained in one housing, with no need for a separate outdoor condenser on the wall or roof. This removes planning and location considerations for the outdoor unit.
  • Straightforward to install: Installation is faster and less disruptive than a split system, typically completed within a few hours once the aperture or window position is confirmed.
  • Effective for single rooms: A correctly sized window unit provides reliable cooling for the room it serves, maintaining comfortable temperatures during warm weather.
  • Suitable where split systems cannot be fitted: In properties where there is no suitable position for a split system outdoor unit, a window installation may be the only viable air conditioning option.
Window air conditioning unit viewed from inside a room

Types of air conditioning

Whether you’re looking for AC for a single room, an office, a school, or an industrial complex, we at Lux Cooling Group have the solutions for you. If you’ve been wondering ‘what type of air-conditioning is the best?’ then our handy guide has everything you need to know…

Cassette Air Conditioners

Cassette air conditioners are installed within the ceiling, leaving only a discreet grille visible. They distribute air evenly in multiple directions, making them ideal for larger rooms, open-plan spaces, and homes where a clean, unobtrusive appearance is preferred.
Cassette Air Conditioners

Ducted Air Conditioning Systems

Ducted air conditioning provides whole-home climate control through a network of concealed ducts. Air is distributed evenly throughout the property, while zoning options allow different areas to be cooled independently for enhanced comfort and energy efficiency.
Ducted Air Conditioning

Multi-Split Air Conditioners

Multi-split air conditioning systems connect several indoor units to a single outdoor unit. They allow independent temperature control in multiple rooms, making them a practical solution for homes that require flexible comfort without installing multiple outdoor condensers.
Multi-Split Air Conditioners

Window Air Conditioners

Window AC is most suited to those that are looking to cool a single room or a small area. As the name suggests, these systems are installed by a window or by making a hole in the wall.

Window Air Conditioners

Keep Your System Running All Year

Installation is just the beginning. We offer annual servicing and maintenance packages to keep your system efficient, extend its working life, and protect your warranty. Our engineers cover all of London and Essex and can respond quickly to any service call.

AC Maintenance Services
Lux Cooling Group engineer carrying out an AC service

Aircon Installation Across London and Essex

We carry out installations across London and Essex from our base in Loughton. For location-specific information, visit our London or Essex pages.

Explore other system types, see: Cassette Air Conditioners | Multi-Split Systems | Window Units | Duct Air Conditioning.

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London

  • All London boroughs
  • East and West London
  • North and South London
  • Central London

AC installation in London

Essex

  • Chelmsford, Colchester
  • Brentwood, Harlow
  • Basildon, Southend
  • All Essex towns

AC installation in Essex

Frequently asked questions about window air conditioning

Can a window AC unit be installed through a wall instead of a window?
Yes. Where a window is not available or is not a suitable position, we can cut an aperture through a suitable external wall. We assess the wall construction at the site visit to confirm this is feasible and advise on the appropriate position for the unit, condensate drainage, and external finish.
How much cooling can a window unit provide?
Window units are rated by capacity, typically measured in BTUs. The right capacity depends on the size of the room, the ceiling height, the amount of window glazing, and the direction the room faces. We confirm the appropriate unit capacity at the site visit before recommending a specific model, to ensure the unit can cool the space effectively.
Are window AC units noisy?
Window units are generally noisier than modern split systems because both the compressor and the fan are housed in the same unit inside the room. The noise level varies between models and manufacturers. If noise is a key concern, a wall-mounted split system is usually quieter at occupant level, as the compressor is in the external condenser unit.
Do window air conditioners provide heating as well as cooling?
Some window AC units include a reverse-cycle heating function, but not all do. If you need heating as well as cooling, confirm this requirement when we carry out the site visit so we can specify a suitable unit. For whole-property heating and cooling, a split or multi-split system is generally a more efficient and effective solution.
Do I need planning permission to install a window AC unit?
In most cases, installing a window unit does not require planning permission. However, if the property is in a conservation area or is listed, external alterations including AC installations may require consent. For properties where a wall aperture is needed, permitted development rights apply in most cases, but we confirm the position at the survey stage and advise if any restrictions apply.

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Trusted window air conditioning installers in London and Essex

With over 20 years of experience, we install and maintain window air conditioning systems across London and Essex. Free site surveys, transparent pricing, and a 1-year warranty on all installations. Get in touch and we will arrange a visit at a time that suits you.