Finding a reliable climate control expert in the city can be a huge headache. Your home feels like an oven in July or a freezer in December, and you just need someone to fix it fast.
We totally get it, so we’ve spent hours digging through options to find the best HVAC services London has to offer. Just like you, we wanted to see who actually shows up on time, quotes fairly, and knows their way around complex systems.
If you need a quick repair, a full home upgrade, or just routine maintenance, our top picks deliver solid results without the runaround. Read on!
How much does HVAC cost in London?
Installing a standard residential HVAC or air conditioning setup in London typically sets you back between £1,800 and £6,500, with comprehensive whole-house systems averaging around £17,000.
| System Type | Average Cost (Installed) | Best Used For |
| Single Split System | £1,800 – £3,200 | Individual bedrooms, home offices, or lounges. |
| Multi-Split System (2–4 rooms) | £3,000 – £6,500 | Flats and medium-sized family homes. |
| Ducted / Concealed System | £6,000 – £15,000+ | Whole-house cooling, premium retrofits, and open-plan spaces. |
| Full HVAC Overhaul | £5,000 – £30,000 | Complete new-build properties requiring extensive ductwork. |
How We Reviewed
- Service Versatility: We checked if each company can handle it all, from heating in the winter to keeping you cool in the summer. It’s just easier when one team manages both your boiler and your AC.
- Emergency Availability: Heating and AC always seem to break down at the worst times, so we paid extra attention to companies offering round-the-clock support.
- Industry Certifications: When it comes to things like gas and refrigerant lines, you really want pros with the right credentials. We looked for important certifications like Refcom and F-gas to make sure the work gets done safely.
- Customer Guarantees: A good warranty shows a company stands by their work. That’s why we highlighted installers who give you long warranties and dependable maintenance plans after the job is done.
1. Aza & Sons Services
Website: https://www.azasons.com/
Address: Bow
Contact: 07955 014 805; 0203 885 1103; [email protected]
Hours: Monday-Sunday, 12:00 AM – 12:00 AM
Aza & Sons Services has over 20 years of experience working on both homes and businesses all across London.
They handle everything from new air conditioning installations to routine service checks and refrigerant management, so you don’t have to juggle multiple companies for different jobs.
Someone we talked to needed a new multi-split AC system in their flat and told us the team got it installed quickly and answered every question along the way.
On top of that, they’re just as handy with boiler repairs and even larger industrial heating systems. Their 24/7 availability is a big plus too, especially if your boiler decides to break down in the middle of the night.
But keep in mind, while they’re great with heating and air conditioning, they don’t offer ventilation services.
They really know their stuff
I booked these guys for a boiler service on the recommendation of a friend, whose boiler they’d fixed after another professional had failed to resolve the issue. It’s clear from the moment they arrive that they really know their stuff. Friendly and professional throughout, and they take the time to explain exactly what’s needed and why. Would definitely use again.
- Jessica Gribble, Google Review
I highly recommend their service
Before I came across Aza and Sons I had contacted a few other companies, but they either gave me unrealistic timeframes or asked me to email them instead. I found Aza and Sons through a Google search received a call back immediately and had my air conditioning units serviced the very same day. I highly recommend their service and will definitely be using them again in the future
- Gamze K, Google Review
2. Debonair Cooling
Website: https://debonaircooling.co.uk/
Address: Office 105, Atlas Business Centre, Oxgate Lane
Contact: 020 4538 5723; [email protected]
Hours: Monday-Sunday, 6:00 AM – 8:00 PM
Debonair Cooling really stands out with their Daikin D1+ status, offering incredible warranties up to 10 years on top of expert installations and repairs.
Their REFCOM-certified engineers handle a variety of air-conditioning configurations, from simple wall-mounted split systems to complex ducted setups for homes and businesses.
If you need a reliable lounge unit, their modern inverter split systems act as reverse-cycle heat pumps to keep you warm during the winter.
However, if you need full HVAC services like boiler repairs or mechanical ventilation, you’ll need to look elsewhere, as they focus exclusively on air conditioning and don’t offer traditional heating options.
The service was absolutely flawless with minimal disruption
Recently had an aircon unit fitted in a Comercial premises. The service was absolutely flawless with minimal disruption. The lads were very polite and punctual. They are well priced, smooth, slick service – from initial enquiry, through to virtual survey and installation.
- Naresh Hirani, Google Review
I highly recommend Debonair Cooling
I recently hired Debonair Cooling for an air conditioning installation, and they exceeded my expectations. From the initial consultation to the final installation, the team was professional, knowledgeable, and efficient.
They helped me choose the right system, explaining everything clearly. On installation day, they arrived on time, worked quickly, and left my home spotless. The new system runs quietly, efficiently, and keeps my home perfectly comfortable.
Their customer service was outstanding, answering all my questions and making the entire process stress-free. I highly recommend Debonair Cooling for reliable, top-quality service!
- Nikil Surendra, Google Review
3. The Air Conditioning Company
Website: https://www.airconco.com/
Address: Unit 2, Bittacy Business Centre, Bittacy Hill
Contact: 020 8346 6000; [email protected]
Hours: Monday-Friday, 8:45 AM – 5:30 PM
The Air Conditioning Company stands out by offering a generous 10-year warranty on their installations, as long as you stick to their annual servicing plan.
They make things easy from the start with a free site survey, so you can see all your options before spending any money.
If you’re unsure about what would work best for your home or office, you can drop by their dedicated showroom, where you’ll find different wall-mounted and ceiling-mounted units on display.
According to a customer we spoke to, the staff were helpful and took the time to explain noise levels on some of the low-wall-mounted models. The company covers all of Greater London and provides both permanent installations and portable AC rentals, too.
However, they only focus on air conditioning, not full-scale heating. Also, they’re closed on weekends.
A very professional job inside and out with high-quality materials
From start to finish the Aircon company were great to deal with. The initial survey was conducted promptly after my inquiry and a quote quickly received. On the installation date, the engineer arrived promptly and worked very efficiently, he was exceptionally clean and tidy and even re-hung a heavy mirror for me which had to be moved to accommodate the Aircon unit. A very professional job inside and out with high-quality materials. Would highly recommend.
- Cathy Chambers, Google Review
Very professional service from a well-established company
Residential AC install in a London townhouse. Very professional service from a well-established company that also has a decent show-room. Multiple home visits to estimate cost and then survey where to install, with detailed project plan provided before install date set. Various options provided and I was consulted at all stages. Neat install job.
- Jonathan Miles, Google Review
4. Be Cool Refrigeration & Air-conditioning
Website: https://becoolrefrigeration.co.uk/
Address: Office 7, 35–37 Ludgate Hill
Contact: 0203 488 1889; [email protected]
Hours: Monday-Sunday, 12:00 AM – 12:00 AM
Be Cool Refrigeration & Air-conditioning is a one-stop shop for anyone needing both air-conditioning and commercial refrigeration.
Their F-Gas certified engineers are available 24/7, so they’re ready to jump in if you have a sudden breakdown anywhere in London or nearby areas.
Several customers have shared how responsive they are, mentioning that same-day emergency repairs are common.
The company installs everything from simple single split systems for homes to large, multi-zone VRF networks for big commercial spaces. They even handle water-cooled air-conditioning setups, offering solutions for more specialised properties.
Just know that their focus is squarely on cooling, so you won’t get traditional heating or full-scale HVAC upgrades here.
Very fast and efficient company
Ali & Jhonal from service and Alp, Ilyas & Osama from the installation team were great from start to finish. From enquiry to finalising installation of 3 AC units in our house took under two weeks with consistent communication from BeCool. Very fast and efficient company & they beat the quotes from various other AC companies. Super happy with the final installation and would recommend to anyone thinking about getting a residential AC unit. Thanks again
- Simon D (Simon), Google Review
I cannot thank them enough
The company owners and employees are very professional and understandable. They diagnosed the problem and managed to repair my Cold Room very efficiently. There service is highly valued as any refrigeration failure can be costly to our stock if not repaired immediately. I cannot thank them enough for handling the emergencies so professionally!! Highly recommended!!!
- Alex Tse, Google Review
5. Warm & Cool London
Website: https://warmandcoollondon.co.uk/
Address: The Vineyards, 36 Gloucester Avenue
Contact: 0203 633 2322; [email protected]
Hours: Monday-Sunday, 12:00 AM – 12:00 AM
Warm & Cool London gives you access to a fully well-rounded HVAC experience, combining boiler work, air conditioning, and heat pumps under one roof.
They employ Heat Geek-accredited installers to design and fit high-efficiency heat pumps, alongside installing premium Vaillant boilers for local homeowners.
Their F-gas-accredited team, on the other hand, fits AC units for apartments, cafés, and salons, focusing heavily on systems that both heat and cool. This makes them a smart choice for anyone seeking year-round climate control.
If you need some electrical components checked alongside your system, they can even point you toward trusted electricians.
However, their boiler servicing packages strictly exclude repair work. To add, their cooling installations cater mostly to domestic or light commercial spaces, skipping over heavy industrial setups.
Would recommend to anyone
Hilton and team installed an ASHP at our property, it’s been a great addition.
The whole process from consultation, to design and delivery has been handled with professionalism.
Hilton has patiently worked through the details and my questions during the entire process. We have ended up with a system that just hums (quietly) along.
Would recommend to anyone looking for a reliable partner in your Heat Pump journey
- Rob Hand, Google Review
Hilton was very knowledgeable
After my usual heating engineer retired, I was recommended Warm and Cool London. They came promptly and did a great job servicing my Vaillant boiler. Hilton was very knowledgeable and also sorted out a couple of issues. He noticed the diverter valve slightly leaking and organised with Vaillant to fit a new one under warrenty. He also fitted a new filling loop, which later in the day developed a fault. They came back quickly and sorted it out with no fuss.
Warm and Cool were on time, friendly, professional and reasonably priced. I’ll definately use them again!
- Malcolm Mynett, Google Review
