Professional Air Conditioning Installation & Repair Across London – Fast, Reliable Service

Expert AC Installation, Repair & Maintenance for Homes & Businesses

We proudly serve homes and businesses across London, Surrey, and nearby areas including Acton, Balham, Chiswick, Clapham, Ealing, Fulham, Hammersmith, Kingston, Richmond, Twickenham, and more

What Our Clients Say

Reliant LDN Limited

5.0

Based on 52 reviews

review us on

Jill Marshall

12:57 30 Jun 25

My daughter had blocked plumbing but was away - John came quickly to meet me at her house, sorted the problem quickly and efficiently and was a great communicator - despite fact he was not dealing with the house owner. Highly recommend

Kim Gray

08:44 13 May 25

Fantastic service from start to finish. The team at Reliant LDN were friendly, knowledgeable, and always quick to respond. Communication was clear throughout, and everything was handled efficiently and professionally. Really impressed by how fast they turned things around—would highly recommend!

Laura Ingate

18:33 26 Apr 25

Harry came to help fit a new toilet, fix our slow draining sink and remove a radiator. He did a brilliant job and kept us up to date with what he was doing. Would definitely recommend. Thank you!

James Allan

08:42 22 Apr 25

Reliant were recommended to us ourselves by some friends and we had a some aircon units installed. We were very impressed by the professionalism and quality of Ricky and Ethans work. They were clear about what they were doing throughout and great guys. Highly recommend

Peter Crowther

12:05 23 Jan 25

Reliant visited us again for our Ecotec gas boiler service. Excellent W4 London assistance checking the boiler and flue, and good advice re electrodes and water temp. and water flow. Excellent service as usual. Peter C.

Topher Martyn

08:37 17 Jan 25

Reliant are an excellent group of plumbers/heating engineers. I've used them a number of times, ranging from installing a new boiler through to gas safe checks and general plumbing and cannot fault them.
They always turn up on time, if not slightly early, and the works are completed tidily and efficiently and for a good price.
Very much recommended.

Rowan Tolhurst

18:10 03 Jan 25

I have nothing but good things to say about the service I received from the Reliant team. My boiler broke over Christmas and reliant were recommended to me and they didn’t disappoint. Ricky was round quickly to diagnose, and was reluctant to tell me all of the problems there were with my very old boiler. I decided to replace it and again received fab service from Dennis. They responded quickly, have done great work, were clean and tidy despite having to move multiple appliances to reach the boiler, took their time to show me how to use it and even took care around my pet! All of this for an incredibly reasonable price. I will definitely be coming back for any issues I have in the future and would recommend to everyone.

Dee Pell

11:16 03 Jan 25

I have used Reliant on a few occassions for various jobs and have found them to be reliable, knowledgeable and have faith they will resolve the issue. I have also recommended them to friends who have been equally delighted with their work. Would have no hesitation in using them again.

Alison Ramshaw

10:51 30 Dec 24

Ricky came to resolve a plumbing issue we had. He was very professional, thorough and resolved the issue properly and quickly. Would highly recommend.

Romilly

18:07 29 Nov 24

Very happy with the service I received from Reliant. Faris was a nice guy and a great engineer, not only did he fix my boiler he also gave me some advice after I had been scammed by a different company who put a lot of pressure on to upsell me a new boiler. He assured me that my boiler was in good condition and did not need to be replaced so he saved me a considerable amount of money. Wouldn’t hesitate to recommend Reliant - friendly, efficient and honest service. 10/10!

Our Air Conditioning Services in London

Air Conditioning Installation London

From small homes to large offices, our engineers will design and install a tailored AC system that matches your space, budget, and energy goals.

Split system & ducted AC installation

Energy-efficient solutions

Smart thermostat integration

Commercial & residential

System replacement available

When it’s time for a new system, we can help you select and install the best replacement to meet your needs, ensuring improved efficiency and reliability.

AC Repair London

Dealing with a noisy, leaking, or non-working unit? We provide fast AC repairs with clear diagnostics and quick fixes—so you stay comfortable all year round.

Emergency breakdown service

Gas leak detection

Fault diagnosis & fixes

All makes & models

Air conditioning Maintenance Services

Prevent costly breakdowns and keep your unit energy-efficient with regular servicing. We offer scheduled maintenance for both homes and commercial buildings.Emergency breakdown service

Annual performance checks

Filter cleaning & replacement

Efficiency optimization

Preventative care plans

Residential & Commercial Air Conditioning Experts

We work with:

Homes & Flats
Offices & Shops
Restaurants & Cafés
Warehouses & Studios

Whether you need a single split unit for your bedroom or a multi-zone HVAC system for your business, we design and install tailored air conditioning solutions to suit your space, usage, and budget.

Already have a system? We also provide fast repairs and ongoing maintenance to keep your AC running reliably, all year round.

Why Reliant Is London’s Trusted Air Conditioning Expert

Frequently Asked Questions

How much does it cost to install air conditioning in London?

The cost to install air conditioning in London typically ranges from £1,500 to £15,000+, depending on:

System type (split units vs. ducted systems)
Property size (single room vs. whole building)
Energy efficiency (inverter vs. standard units)
Installation complexity (listed buildings, high ceilings, etc.)

For an exact quote tailored to your London property, request a free assessment. We offer transparent pricing with no hidden fees.

Do you need planning permission to install air conditioning in the UK?

Generally, most air conditioning installations in residential and commercial properties in the UK do not require planning permission. However, exceptions may apply in listed buildings or conservation areas. Our team will assess your property and guide you through any local regulations to ensure a hassle-free installation. Need expert guidance? Book a free consultation.

Do you need an electrician to install an air conditioner?

Yes, installing an air conditioning system usually requires a qualified electrician to handle the electrical connections safely and in compliance with UK regulations. At Reliant, our certified engineers handle electrical work, providing safe, efficient, and fully guaranteed service. No need to hire anyone else. Get in touch to learn more.

Is it worth repairing an AC unit?

Repairing your air conditioning unit can be cost-effective if the system is relatively new and the repair is minor. However, for older units or major faults, replacement may be more economical in the long term, offering better energy efficiency and reliability. Our technicians provide honest assessments and can recommend the best solution for your situation. Not sure whether to repair or replace? Speak to our team.