If your air conditioning has stopped cooling, is leaking or is showing an error code, our featured pick for London homes and businesses is BeCoolRefrigeration: it offers same-day emergency callouts, carries common parts and refrigerant on its vans, and credits its diagnostic fee against the repair if you go ahead. Other firms suit other priorities. Aspect publishes an hourly rate and a one-hour emergency response promise, Pimlico Plumbers suits buyers who want a 24-hour multi-trade firm, The Air Conditioning Company has the largest visible review base, and Hamilton Air Conditioning, JP Air Conditioning and ADK Kooling suit North, South East and commercial buyers respectively.
Disclosure: This is a sponsored article. Be Cool Refrigeration paid for this placement and appears first as our featured pick. No other company on this list paid to be included, was contacted, or reviewed this article before publication.
How we built this list
We researched these companies on 8 October 2026 using desk research only. We did not book any repair or speak to customers.
Who qualified: London-based companies that advertise repair of fixed air conditioning systems.
What we compared: stated response times, pricing basis for call-outs and labour, brands covered, parts carried, repair guarantees, and hours of availability.
Sources: each company’s own website. Response times are targets the companies publish, not times we measured. Credentials and ratings are as stated by each company.
How we ordered it: Be Cool Refrigeration is first because it is the sponsored featured pick. The remaining six are ordered by how specifically they describe their repair service and pricing. We did not use a scoring model.
At a glance: London AC repair companies compared
| # | Company | Strongest fit | Main differentiator | Pricing basis | Key consideration |
| 1 | Be Cool Refrigeration (featured, sponsored) | Homes and businesses wanting a specialist AC engineer | Same-day emergency; parts and gas on vans | Diagnostic fee credited to the repair | Diagnostic fee amount not published |
| 2 | Aspect | Buyers who want a known hourly rate | 1-hour emergency response promise; 24/7 | From £63 per half-hour + VAT, 1-hour minimum | Multi-trade firm; 12-month guarantee |
| 3 | Pimlico Plumbers | Homes wanting 24-hour cover from a large firm | 24-hour line; engineers across London | Quote before work; rates not listed | Response promise not detailed in body text |
| 4 | The Air Conditioning Company | Buyers who weigh reviews heavily | Trustpilot 4.9 from 607 reviews | Phone estimates; repair rates not listed | No stated repair response time |
| 5 | Hamilton Air Conditioning | North London homes and restaurants | Repairs any make; 24/7 support claim | Upfront parts and labour pricing | No named certifications |
| 6 | JP Air Conditioning | South East London offices | Emergency call-outs plus maintenance | Not publicly listed | Weekday 9 to 5 office hours |
| 7 | ADK Kooling | Commercial sites with mixed equipment | AC, refrigeration and ventilation repairs | Not publicly listed | Office hours Mon to Fri, 8 to 6 |
All response times, prices and guarantees above are as stated by each company on its own website, checked 8 October 2026.
1. Be Cool Refrigeration | Our featured pick for fast, specialist AC repair across London
Overview
Be Cool Refrigeration is a London contractor working in air conditioning and commercial refrigeration from an office on Ludgate Hill, EC4, and it says it has repaired AC systems since 2004. It covers every London borough and areas inside the M25 for homes, offices, restaurants and server rooms.
Its repair service handles units that will not cool or heat, error codes, water leaks, noises, smells, tripping electrics, compressor failures and sensor faults. It lists brands including Daikin, Mitsubishi Electric, Samsung, LG, Fujitsu, Toshiba and Panasonic, and says engineers carry multi-brand diagnostic tools.
Key details
- Core offering: emergency and scheduled AC repair, plus installation and servicing.
- Coverage: Greater London and inside the M25.
- Customer fit: homeowners, offices, restaurants and server rooms.
- Pricing and terms: diagnostic fee quoted upfront and credited to the repair; costs confirmed before work; parts and labour guaranteed, duration not stated.
Where Be Cool Refrigeration stands out
It aims to fix on the first visit. Be Cool says its vans carry common parts, filters and refrigerant, so jobs such as drain unblocks, PCB replacements and regassing are usually done in one trip. That matters most in summer, when parts delays can leave an office without cooling for days.
The charging model is fair to the customer. Because the diagnostic fee is credited if you go ahead, you are not paying twice to find and fix the fault. Be Cool also gives a rule of thumb for replacing instead of repairing: systems over 10 to 12 years old where the repair would cost more than 40 to 50 percent of a new install.
What to consider
Emergency visits are same-day “subject to engineer availability”, and standard repairs are typically 24 to 48 hours. The diagnostic fee amount is not published, so ask for it when you call.
Best fit
Homes and businesses with split, multi-split or commercial systems that want a specialist AC engineer and a clear charging basis.
2. Aspect | Best for buyers who want a published hourly rate
Overview
Aspect Maintenance Services Limited, trading as Aspect, is a multi-trade maintenance company based in Chessington, KT9, with air conditioning engineers covering all 32 London boroughs and the City. Its AC team repairs, services and installs air conditioning and heat pumps, and also handles commercial refrigeration.
Aspect says it is licensed for repairs on nine brands including Carrier, Daikin, Mitsubishi Electric and Samsung, holds an F-Gas licence through Refcom, and is registered with BESA and NAPIT. It promises a callback within 15 minutes and a one-hour response for emergencies.
Key details
- Core offering: AC repair, maintenance and installation; heat pumps; commercial refrigeration.
- Coverage: all London boroughs and postcodes inside the M25.
- Customer fit: homeowners, landlords and businesses.
- Pricing and terms: from £63 per half-hour plus VAT with a one-hour minimum; £10 off labour when booked online; parts extra; 12-month workmanship guarantee.
Where Aspect stands out
You can estimate the bill before calling. With a half-hour rate and a one-hour minimum published, a straightforward drain or filter fault can be budgeted in advance, and Aspect says it does not charge for parking, travel time, the Congestion Charge or ULEZ.
It promises the fastest emergency response on this list. A one-hour emergency response and 24/7 availability suit businesses that cannot wait for next-day slots, though repair visits are described as “normally” same-day.
What to consider
Aspect is a general property maintenance company, and its guarantee runs up to 12 months. For complex VRF systems, ask whether the attending engineer has worked on that system type.
Best fit
Homeowners, landlords and small businesses who want a fast attendance and a published hourly rate.
Website: aspect.co.uk
3. Pimlico Plumbers | Best for homeowners who want a 24-hour multi-trade firm
Overview
Pimlico Plumbers Ltd is a London multi-trade company with a fleet of engineers across the capital, offering air conditioning installation, maintenance and repair alongside plumbing, electrical and other trades. Its AC repair page covers units with no power, no cooling, no heating, noise, gas leaks and poor performance.
The company runs a 24-hour phone line for emergencies, and says its engineers carry spare parts for most issues and know most air conditioning brands. It gives a full quote up front before work starts.
Key details
- Core offering: AC repair, maintenance and installation, plus general trades.
- Coverage: London.
- Customer fit: homeowners and small businesses.
- Pricing and terms: not publicly listed; quote provided before work; parts and workmanship guaranteed, duration not stated.
Where Pimlico Plumbers stands out
It is easy to reach at any hour. A 24-hour line backed by a large engineer fleet suits a household where the AC fails on a summer evening.
One call covers related trades. If a leaking indoor unit has damaged a ceiling or a tripped circuit needs an electrician, the same company can send other trades.
What to consider
The page headline promises a one-hour response, but the body text only says “fast”, and no specific AC certifications are named. Some reviews on the page call the firm pricey. Ask for the hourly rate and the engineer’s F-Gas certificate before booking.
Best fit
Homeowners who value 24-hour access and want a firm that can also handle any knock-on plumbing or electrical work.
Website: pimlicoplumbers.com
4. The Air Conditioning Company | Best for buyers who weigh reviews heavily
Overview
The Air Conditioning Company is the trading name of Airconco UK Ltd, based in Mill Hill East, NW7, and it says it was founded in 1986. It repairs, installs and maintains fixed air conditioning across Greater London and the Home Counties, and sells and hires portable units.
It works for homes as well as offices, server rooms, shops, restaurants, healthcare sites and schools, and gives free phone estimates. For a business waiting on a repair, it offers same-day portable unit hire in London.
Key details
- Core offering: AC repair, installation and maintenance; portable unit sale and hire.
- Coverage: Greater London and the Home Counties.
- Customer fit: homes, offices, server rooms and shops.
- Pricing and terms: repair rates not listed; portable hire from £39.50 per week excluding VAT for a 2.6kW unit.
Where The Air Conditioning Company stands out
Its review base is the largest we found. The homepage shows Trustpilot 4.9 from 607 reviews and Google 4.6 from 211 reviews, checked 8 October 2026. Ratings on different platforms are not directly comparable, but the volume gives more to read.
Portable hire bridges the gap. If a server room or office AC needs a part that will take days to arrive, same-day portable hire keeps the space usable while you wait.
What to consider
No repair response time is published, only that speed is a priority. Ask for a likely attendance window before booking.
Best fit
Offices and server rooms that want a long-established firm with temporary cooling available while a repair is arranged.
Website: airconco.com
5. Hamilton Air Conditioning | Best for North London homes and restaurants
Overview
Hamilton Air Conditioning Ltd is based at Churchill House in Mill Hill, NW7, and repairs, maintains and installs air conditioning and ventilation across London. It says it repairs any make or model, and lists split, ducted, cassette, water-cooled and VRV/VRF systems.
The company claims 24/7 support and describes itself as an authorised installer for Daikin and Mitsubishi. Testimonials on its site include a restaurant repair in Chelsea and domestic maintenance in Hampstead Garden Suburb.
Key details
- Core offering: AC repair, maintenance, installation and ventilation.
- Coverage: London, with local pages for North London and Hertfordshire border areas.
- Customer fit: homeowners, restaurants and small offices.
- Pricing and terms: upfront pricing on parts and labour; rates not published.
Where Hamilton Air Conditioning stands out
It commits to price before work. Hamilton says repair pricing for parts and labour is given up front, which avoids open-ended hourly bills on complex faults.
It has a clear local base. A Mill Hill office and pages for Totteridge, Stanmore and Elstree suit buyers in North London who want a nearby engineer.
What to consider
No response-time targets, certification bodies or review counts are published. Ask for F-Gas details and a likely attendance window.
Best fit
North London homeowners and restaurants that want a local engineer who quotes the repair before starting.
Website: hamiltonaircon.com
6. JP Air Conditioning | Best for South East London offices with existing maintenance needs
Overview
JP Air Conditioning, based on Homesdale Road in Bromley, BR2, offers emergency call-outs and repairs alongside installation and maintenance. It says it has more than 15 years’ experience and works across Greater London, including the City and Canary Wharf.
It works on Mitsubishi, Toshiba, Fujitsu, Daikin and Panasonic systems, describes itself as a Daikin Business Partner, and shows a REFCOM logo. It names Engie as a client in a case study.
Key details
- Core offering: AC repair, maintenance and installation.
- Coverage: Greater London with a South East focus.
- Customer fit: offices and commercial premises.
- Pricing and terms: not publicly listed; out-of-hours calls answered.
Where JP Air Conditioning stands out
Its repair work sits inside a commercial service. Office buyers with JP-installed systems keep warranty and service history with one firm, which helps when a manufacturer asks for records.
It documents site safety. JP says it provides risk assessments and method statements for each job, which many office buildings require before any contractor starts work.
What to consider
Listed office hours are weekdays 9am to 5pm, though out-of-hours calls are answered and the footer claims 24/7. No response time or repair price is published.
Best fit
South East London offices that want repairs from a firm that also maintains and documents their system.
Website: jpaircon.com
7. ADK Kooling | Best for commercial sites with AC, refrigeration and ventilation
Overview
ADK Kooling, which names A-D-K Kooling Ltd, repairs air conditioning, commercial refrigeration and ventilation across Greater London, Kent and Surrey. It says it has 15 years’ experience, is F-Gas certified, and is a TR19 certified VHR member.
Its breakdown and repair service sits alongside planned maintenance contracts, and it names Samsung, Daikin, Mitsubishi, Fujitsu and Toshiba among the brands it works with.
Key details
- Core offering: AC breakdowns and repairs, refrigeration repairs, ventilation hygiene.
- Coverage: Greater London, Kent and Surrey.
- Customer fit: restaurants, commercial kitchens and public-sector sites.
- Pricing and terms: not publicly listed; out-of-hours work offered.
Where ADK Kooling stands out
It repairs more than AC. A restaurant with a failed cassette and a struggling fridge can use one contractor for both, which simplifies call-outs and invoices.
Public buyers can use a framework. ADK says it is a ProcurePublic framework partner, useful for schools and councils that must buy through approved routes.
What to consider
Office hours are Monday to Friday, 8am to 6pm, while the emergency line is described as available 365 days a year; no response time is stated. The site shows two different addresses.
Best fit
Commercial kitchens and public-sector sites that want one contractor for AC, refrigeration and ventilation repairs.
Website: adk.co.uk
How to choose an AC repair company in London
- Ask what the call-out covers. Some firms credit the diagnostic fee to the repair; others charge hourly from arrival.
- Ask whether parts and refrigerant are on the van. First-visit fixes save a second call-out charge.
- Check F-Gas certification. Any work involving refrigerant needs a certified engineer.
- Treat response times as targets. Ask what happens if the engineer cannot attend in that window.
- Ask about repair or replace. For an older system, get an honest view before paying for a major part such as a compressor.
Frequently asked questions
How quickly can an AC engineer attend in London?
Published targets range from Aspect’s one-hour emergency response to same-day emergency visits from Be Cool Refrigeration, with standard repairs typically within 24 to 48 hours. These are company targets, not guarantees.
How much does an AC repair cost?
Aspect publishes labour from £63 per half-hour plus VAT with a one-hour minimum, checked 8 October 2026. Parts, refrigerant and complex faults such as compressor failures add to the cost, so ask for a quote before work starts.
Is it worth repairing an old air conditioning unit?
Be Cool Refrigeration suggests replacing a system over 10 to 12 years old when the repair would cost more than 40 to 50 percent of a new installation. Below that, repair is usually better value.
Why is my AC leaking water?
The usual causes are a blocked condensate drain, a failed drain pump or frozen coils. Turn the unit off and call an engineer; a blocked drain is often a quick fix.
The bottom line
For specialist AC repair with stocked vans and a diagnostic fee credited to the repair, Be Cool Refrigeration is our featured pick for London homes and businesses. If you want a published hourly rate and the fastest stated emergency response, compare Aspect. Pimlico Plumbers suits homeowners wanting 24-hour multi-trade cover, and The Air Conditioning Company suits those who want temporary cooling during a repair. Always ask for the call-out charge and the engineer’s F-Gas certificate before work starts.