What are internal air conditioning units

You may have heard about Cool You’s internal air conditioning system. But you might be wondering what internal air conditioning units are, sometimes known as internal AC units. If you live in a London apartment or listed building, you may think air conditioning isn’t possible — but it is.

Internal air conditioning units, also known as fully internal or water-cooled air conditioning systems, offer powerful, efficient cooling without needing an external condenser.

At Cool You, we specialise exclusively in these systems — designed for apartments, flats, and heritage properties across London where traditional air conditioning can’t be installed.

Here’s a rundown of everything you need about internal air conditioning units. This includes how they work and what the benefits of an internal AC unit are.

Our internal air conditioning units are a no-compromise solution. They are a fully-fledged air conditioning system without penetrating the external walls. Restrictions may come from the building’s weatherproofing or other exterior skin features. All of these can prevent installing a traditional air conditioning unit outside.

The conventional air conditioning market involves fitting a rather unattractive box outside the building. Not everyone can have a traditional system. If this sounds familiar, you’ll be pleased to learn that Cool You has the perfect solution.

What are internal air conditioning units? How does the system work?

Our internal air conditioning units include the following:

• The room unit/fan coil is retro-fitted high up on the interior wall.
• Alternatively, we can install it into existing fittings as a concealed, ducted unit during a refurb. This option will look the most attractive in any interior.
• Refrigeration pipework runs from that unit, concealed within the walls/ceilings, to the condenser box. Typically, the condenser box goes outside. Still, with our system, the condenser is inside, usually in a concealed space like beneath the kitchen counter.

The result is a fully functional air conditioning system that doesn’t breach any restrictions that prevent installing a conventional unit. It’s the ideal solution whether your property has restrictions or not.

What are the benefits of internal air conditioning units?

Our system’s first significant benefit is obvious: it offers an efficient and effective solution. No matter what type of property you live in, our internal air conditioning units will work.

However, there are additional benefits that aren’t as self-explanatory when you’re trying to understand what internal air conditioning units are.

One significant benefit is that it is easy to maintain, not just because of our maintenance programme. Accessing conventional units can be challenging. Sometimes, you even need permission from landlords or other authorities to access them. So, having everything kept within your property is a huge benefit.

With no unsightly or noisy installations on the exterior of a property, internal air conditioning units don’t disturb your neighbours. You don’t want to bother the people who live or work around you, and you certainly don’t want to give them cause to complain. With the whole system installed internally, that’s not a problem.

A Cool You AC internal unit is also highly discreet

An AC internal unit is also highly discreet. Because the entire system is located within the apartment or home, it integrates seamlessly into your interior, hidden in cupboards or neatly mounted on walls. It doesn’t affect your building’s appearance and is ideal for properties where external modifications aren’t allowed, such as listed buildings or developments with strict planning restrictions.

One of the biggest advantages of choosing an AC internal unit is the flexibility it offers. Whether you’re in a modern high-rise flat or a period conversion, these systems can be tailored to your space with minimal disruption. You get powerful, quiet, reliable cooling without compromise.

Keep your outdoor space free with our internal air conditioning system

Outdoor space matters to London apartment owners. It’s a place to relax and entertain. With traditional air conditioning, the external condenser box takes up most of the outside area. This box also makes a lot of noise when it’s running. An internal air conditioning solution eliminates this issue, protecting your precious outdoor space and maximising your enjoyment.

Most importantly, internal units maintain a consistent indoor temperature. An external box aims to constantly remove hot air from the room whilst simultaneously pumping cool air in. When it’s outside and exposed to direct sunlight, performance is compromised. It will not be able to maintain a consistent temperature. With our internal systems, this never happens.

So, what is an ac internal unit, and what else do you get with a Cool You system?

Here are some additional benefits of a Cool You AC internal unit:

• They are intelligent systems, meaning they are fully WiFi controllable.
• They filter the air, removing dust, pollutants, and other allergens from your property.
• There is no compromise on performance; the internal system cools and dehumidifies as effectively as any conventional air conditioning system.
• Every Cool You installation is backed by our full 6-year parts and labour warranty – covering the room unit, internal condenser, and all refrigeration pipework, subject to a signed maintenance agreement. This means you can relax, knowing your system is protected long after installation. For additional components, such as the condensate pump (where fitted) and plumbing connections at the condenser, we provide a 1-year warranty, offering clear, comprehensive coverage across your system.
• They also have exciting features like Blackout technology and i-Feel temperature control.
• Our expert team is honest and transparent every step of the way.

A Cool You air conditioning system – the bottom line!

In a nutshell: a Cool You internal air conditioning unit really is a no-brainer. It offers so many benefits, with absolutely no compromise.

If you are looking to install a system but aren’t sure what internal air conditioning units are (AC internal unit), we’re here to help. If your building has restrictions that prevent installing a conventional A/C unit, but you still want a solution to cool your apartment, we are here for you.

“The system keeps our London flat cool even on the hottest days. No external unit, no hassle — just perfect comfort.”
— David F., Verified Trustpilot Review ⭐⭐⭐⭐⭐

Thinking About Cooling Your London Home?

If you have any questions about Cool You and our innovative internal air conditioning solutions, please feel free to contact us on 020 7043 2275. One of our friendly, helpful team will be on hand to answer your questions. Alternatively, you can send us an email at enquiries@coolyoudirect.co.uk, and we’ll get back to you as soon as possible.

There is plenty of detailed information about our systems on our website, so please feel free to have a browse and see what you think. Otherwise, we look forward to hearing from you!