Air Conditioning Without the Need for an Outside Unit
The ideal solution for apartments and listed buildings in London where external units aren’t allowed — discreet, efficient and installed in as little as 7 days.
Discover the No-Outside-Unit Solution
Been Told You Can’t Install Air Conditioning in Your London Apartment or Listed Building?
At Arcas Air Conditioning, we specialise in cooling solutions for apartments, listed buildings, and conservation areas in London—especially where external modifications are restricted or outright forbidden.
Does any of this sound familiar?
- Your home gets uncomfortably hot during summer?
- You struggle to sleep well at night due to heat?
- You’re not allowed to make exterior changes to your property?
- You avoid opening windows because of noise or pollution?
If you answered yes to any of these questions, you’re in the right place.
Call us today on 0772 365 1551 to discover how our air conditioning without an outdoor unit can transform your comfort—without needing planning permission.
Our fully internal, water-cooled air conditioning systems deliver the same high performance as conventional systems, without requiring an external condenser. That means no disruption to your building’s exterior, no red tape, and no compromise on cooling power.
Why Standard Air Conditioning Often Isn’t Suitable for Apartments and Listed Buildings
Many homes across London—especially apartments, listed buildings, and those in conservation areas—face serious challenges when it comes to traditional air conditioning. That’s because most conventional systems require an external condenser, which is either prohibited by planning rules or simply not practical due to space constraints.
Planning Restrictions
If you live in a new-build apartment, chances are your lease or building management won’t allow external modifications. Likewise, listed buildings and homes in protected areas require strict planning permission for any changes to the exterior—including fitting an air conditioning unit outside.
That makes installing standard split systems in London’s residential buildings incredibly difficult—if not impossible—without breaching local regulations.
Limited Outdoor Space
Even in properties where planning permission isn’t an issue, space can be. Balconies and outdoor areas are often too small to accommodate a bulky external condenser, and placing one in front of a window may block natural light or ruin the view.
At Arcas Air Conditioning, we solve this problem with our discreet, internal-only air conditioning systems—ideal for compact city homes where space and compliance are both key concerns.
How Our Indoor Air Conditioning System Works
At Arcas Air Conditioning, we provide aircon without outside unit solutions that work just like traditional split systems—but without the need for any external fixtures. Instead of relying on outdoor air to cool the refrigerant gas, our system uses water as the cooling medium. That means no visible outdoor condensers, no planning hassles, and complete discretion—ideal for apartments, listed buildings, and tight urban spaces.
All that’s required is a standard water supply and waste outlet to connect our fully internal condenser unit. The result? Quiet, efficient, and powerful cooling—completely contained within your property.
Ultra-Compact Indoor Condenser
Our innovative water-cooled condenser is designed to stay hidden and out of the way. The smallest model measures just 500mm x 500mm x 295mm—compact enough to fit in a kitchen cupboard, under a sink, or inside a utility room. Perfect for London homes where space is limited.
Seamless Integration with Existing Pipework
Our systems use modern refrigerant piping, discreetly installed inside your home. Since no external unit is needed, there’s no requirement for access to the building exterior—making installation smoother, faster, and completely compliant with local regulations.
Smart Controls via WiFi
All our indoor units come WiFi-enabled, allowing full remote control from your smartphone. You can adjust the temperature, turn the unit on or off, or set schedules from anywhere—ideal for making sure your home is cool and comfortable before you even walk through the door.
Flexible & Stylish Indoor Unit Options
Choose from a range of sleek, modern indoor unit designs. Our systems support wall-mounted, floor-mounted, or ducted concealed units (perfect for spaces with ceiling voids). You get powerful performance with design flexibility to match your interior.
Whisper-Quiet Operation
Our indoor room units operate at noise levels as low as 19dBa—quieter than a whisper. And the internal condenser runs no louder than a quiet washing machine. For additional sound insulation, we can line utility cupboard doors with acoustic foam for near-silent operation.
A+++ Energy Efficiency
All our internal aircon systems are A+++ rated, meaning you get powerful cooling with minimal energy consumption. It’s a smart choice for the environment—and your electricity bills.
The Benefits of Choosing Aircon Without Outside Unit in London
Our water-cooled internal air conditioning systems don’t require an outdoor condenser, making them ideal for listed buildings, conservation areas, and apartments where exterior changes are restricted. No visual clutter. No council approvals.
Designed for discreet installation, our internal units blend effortlessly into any room. Whether wall-mounted or tucked into a cupboard, your interior stays stylish—and the exterior remains untouched.
Our advanced internal systems can cool up to five rooms simultaneously from a single condenser. That means whole-property comfort—without compromising on space or style.
With built-in WiFi functionality, you can manage your air conditioning from your phone. Pre-cool your flat before you get home, or switch off the unit remotely—comfort and control in one tap.
Air conditioning is a major bonus for prospective tenants and buyers. Our elegant, internal solutions add long-term value and improve rental potential—especially in competitive London markets.
Our F-Gas certified engineers install your system with minimal disruption. We take care of everything—from pipework to commissioning—often in just a few days.
Our wall units operate as low as 19dBa, while the condenser is quieter than most household appliances. Enjoy cool air without disruptive humming or vibration—perfect for bedrooms, home offices, and lounges.
Save on Energy Bills With AAA Efficiency
Rated A+++ for energy performance, our systems deliver powerful cooling with low running costs—ideal for London homes where energy efficiency matters.
Up to 5 Years of Extended Warranty
Each system comes with a 12-month parts and labour warranty, which can be extended up to 5 years (3 years full cover + 2 years parts only) when serviced annually by our team.
Our internal systems are just as effective as traditional split units—with no compromises. Enjoy reliable, consistent cooling even during London’s hottest months—without any external eyesores or planning hurdles.
OUR TIME-TESTED TRIED AND TRUSTED PROCESS
Contact us 24/7
You can call us anytime; our helpful staff are here to provide assistance at any hour.
1 hour
Emergency call-outs are a priority; we'll get to you as quickly as we can, typically within an hour.
Issue, sorted
Our qualified AC technician will attend your property to resolve the issue.
Problem, solved
From start to finish, we take care of your maintenance needs and respect your space.
Our 5-Step Process
- Contact Us: Request a free consultation by phone or email.
- Site Survey: We visit your premises to assess layout, usage, and ventilation needs.
- System Design: We design a custom solution using the most efficient equipment available.
- Installation: Our engineers complete the job on time, with minimal disruption to your staff or operations.
- Aftercare & Maintenance: Optional maintenance plans to keep your system in peak condition year-round.
Why Choose Arcas Air Conditioning?
15+ Years of Experience
Trusted across London for residential and commercial air conditioning.
Certified Engineers
F-Gas qualified, fully insured, and experienced with all major AC brands.
Emergency Availability
Same-day and emergency callouts across all boroughs of London.
Workmanship Guarantee
We back our work with a 12-month guarantee for peace of mind.
No Hidden Charges
Clear, upfront pricing with honest advice at every step.
Need air conditioning in London? Call Arcas today on 077 2365 1551
Trusted, local air con engineers in London for installation, repair, and maintenance
