Ducted vs Wall-Mounted Air Conditioning: Which is right for your home in Kent or Sussex?

The short answer:

For most existing homes in Kent and Sussex, a wall-mounted (split) system is the more practical choice; lower disruption, lower upfront cost, and straightforward to install in almost any property. If you’re building something new or undertaking a significant renovation where ductwork can be built in from the start, ducted is worth serious consideration. The right answer depends on your home, your priorities, and what’s actually feasible in your building.

If you’re considering air conditioning for your home in Royal Tunbridge Wells, Tonbridge, Sevenoaks, Crowborough, or anywhere across Kent and East Sussex, you’ve probably already noticed that the question isn’t simply ‘do I need it?’, but it’s ‘which type makes sense for my home?’ 

This post sets out an honest comparison of the two main options,so you can make an informed decision.

Why Is Air Conditioning Worth Considering in the South East Now?

UK summers are changing. The South East has seen several consecutive years of record temperatures, and homes that were comfortable in July a decade ago can now feel genuinely unpleasant during a heatwave. Many properties across Kent and Sussex - particularly older Victorian and Edwardian style homes - were simply never designed with summer heat in mind.

Modern air conditioning systems are also considerably more efficient than older models. The best units now carry a Seasonal Energy Efficiency Ratio (SEER) above 7, meaning they produce seven units of cooling for every unit of electricity consumed. That typically means that a well-chosen system is cheaper to run than portable fans left on throughout a hot week.

One thing worth checking first is that if you already have a heat pump installed, many systems can provide cooling in summer as well as heating in winter. It’s worth asking your installer whether your existing setup has that capability, before committing to a separate air conditioning installation.

How Does Each System Work?

Wall-Mounted (Split) Systems

A wall-mounted unit - sometimes called a split system or mini-split - pairs an indoor unit fixed high on the wall with an outdoor compressor unit. They’re connected by refrigerant pipes running through a small hole in the wall. Each indoor unit serves one room or zone, so a four-bedroom house typically needs four indoor units connected to one or more outdoor units.

The indoor unit is visible, but modern designs are slim and discreet, usually around 20–30cm deep and mounted near the ceiling. They heat and cool the room through direct airflow and can be controlled individually per room.

Ducted Systems

A ducted system runs entirely within the fabric of the building. A central unit, typically located in the loft or a cupboard, distributes conditioned air through insulated ducts to grilles or diffusers in each room. From inside the room, you see only a small ceiling or floor grille. The system is controlled centrally, usually via a smart thermostat.

Ducted systems can serve an entire home from a single installation. They’re also the only option that can be combined with Mechanical Ventilation with Heat Recovery (MVHR), a system that continuously supplies fresh, filtered air to the home while recovering heat from outgoing stale air. This combination is increasingly specified in new builds and high-performance renovations across Kent and Sussex.

Wall-Mounted vs Ducted: A Direct Comparison

Feature	Wall-Mounted (Split)	Ducted
Visibility	Visible indoor unit on wall	Fully concealed - grilles only
Best suited to	Retrofits, individual rooms	New builds, whole-house cooling
Installation disruption	Low - minimal building work	Higher -ductwork required
Zoning flexibility	Good (one unit per room)	Good with multi-zone controllers
MVHR capability	No	Yes (combined systems available)
Retrofit suitability	Excellent	Limited - needs space for ducts

Which System Is Right for My Home in Kent or Sussex?

The honest answer is that it depends on your property and what matters most to you. Here’s where each system tends to make more sense:

Wall-Mounted Is Usually the Better Fit If…

• You’re retrofitting an existing home and want to avoid major building work. This covers the majority of properties we work on across Tunbridge Wells, Tonbridge, and Sevenoaks.

• You only need cooling in one or two rooms, for example a home office and bedroom.

• Budget is a primary consideration and you’d rather start with a single room, and look to expand the system later.

• Your home is a Victorian or Edwardian terrace or semi-detached where roof voids may not have the space for ductwork.

• You’re renting or don’t want to make structural changes to the property.

Ducted Is Usually the Better Fit If…

• You’re building a new home or undertaking a significant renovation where ductwork can be incorporated during construction.

• You want whole-house cooling and heating without visible units in each room.

• Aesthetics matter. You want the system entirely invisible, with small grilles as the only visible element.

• You’re interested in combining air conditioning with MVHR for a high-performance, airtight home.

• Your property has adequate roof or floor void space to accommodate ductwork runs without significant disruption.

Ducted systems can be retrofitted into existing homes, but it’s worth being realistic. It requires accessible voids, typically involves some disruption, and won’t be practical in every property type. A site survey will tell you fairly quickly whether your home can accommodate it and if it can’t, a wall-mounted system is almost always a strong alternative.

What Do I Need to Know Before Installing Air Conditioning in Kent?

Planning permission. External units for both systems are usually covered by permitted development rights and don’t need a planning application. There are exceptions: listed buildings and properties in conservation areas - including many streets in central Royal Tunbridge Wells - may need consent from Tunbridge Wells Borough Council before work starts. We’ll confirm what applies to your property before we do anything.

F-Gas regulations. Air conditioning systems use refrigerants covered by the Fluorinated Gases (F-Gas) Regulations. Installation and servicing must be carried out by an F-Gas certified engineer, this is a legal requirement. Our engineers are fully F-Gas certified.

Running costs. Air conditioning will add to your electricity bill, and how much depends on your tariff and how often the system runs. A unit with a high SEER rating is significantly more efficient, but usage patterns matter most. In most homes, sensible use of a properly sized system costs less to run than portable fans operating for long periods but we’d rather give you a realistic estimate based on your home than a headline figure.

Maintenance. Both system types benefit from an annual service and filter clean. Ducted systems also need periodic duct inspection. Factor this into your total cost from the outset.

How Do I Choose Between Ducted and Wall-Mounted Air Conditioning?

The most useful starting point is a site survey. Every property is different, what works well in a new build in Crowborough can be impractical in a Victorian terrace in Tunbridge Wells, and vice versa. We install both wall-mounted and ducted systems across Royal Tunbridge Wells, Tonbridge, Sevenoaks, Crowborough, Uckfield, East Grinstead, Haywards Heath, and throughout Kent and East Sussex.

Our recommendation is always based on what we actually see at your property. If a ducted system isn’t feasible, we’ll tell you and if a wall-mounted unit will serve you better, we’ll say so.

Not sure which system suits your home?

Use our free site survey to get a straightforward recommendation based on your property, priorities, and budget. We work across Royal Tunbridge Wells, Tonbridge, Sevenoaks, Crowborough, Uckfield, and the wider Kent and East Sussex area. 

Get in touch via our Contact Us page to arrange yours, no obligation, no hard sell.

Frequently Asked Questions

Is air conditioning worth installing in Kent or Sussex?

Increasingly, yes. The South East now regularly sees temperatures above 30°C in summer, and homes that coped in July a decade ago can feel unpleasant today. Modern systems with a Seasonal Energy Efficiency Ratio (SEER) above 7 deliver seven units of cooling for every unit of electricity used which, in practice, typically makes them cheaper to run than portable fans left on all day.

Do I need planning permission for air conditioning in Tunbridge Wells?

Most domestic installations fall under permitted development and don’t require a planning application. There are important exceptions, though: properties in conservation areas and listed buildings may need consent from your local Council before work begins. We’ll confirm what applies to your property as part of the survey.

How much does air conditioning installation cost in Kent?

A single wall-mounted unit typically starts from around £2,000–£2,500 fully installed. Ducted whole-house systems vary significantly depending on property size, structure, and how much ductwork is required. The most reliable way to get an accurate figure is a site survey, we offer these free of charge with no obligation.

How long does air conditioning installation take?

A single wall-mounted unit can usually be installed in two days. Ducted systems typically take two to five days depending on the scope of ductwork. We’ll give you a clear timeline as part of your site survey.

Can a ducted system be retrofitted into an older property in Kent or Sussex?

It’s possible, but it depends on the building. Many properties across Tunbridge Wells, Tonbridge, and Sevenoaks are Victorian or Edwardian in construction, with roof and floor voids that may or may not be suited to ductwork. A survey will tell you quickly whether your home can accommodate it and if it can’t, a wall-mounted system is almost always a practical and effective alternative.

What maintenance does an air conditioning system need?

Both system types benefit from an annual service and filter clean. Ducted systems also require periodic duct inspection. It’s worth factoring this into your running cost calculations from the outset, we can talk through what a maintenance schedule looks like during your survey.