If you need cooling for a server room, comms room or small data cupboard in a London office, our featured pick is Be Cool Refrigeration: it designs server room cooling with temperature and humidity monitoring, high-temperature alarms and redundancy options, and its emergency service prioritises server rooms for same-day attendance. Other firms have their own strengths. The Air Conditioning Company lists server rooms as a sector and can deliver portable cooling the same day, JP Air Conditioning suits offices that need out-of-hours installation and site paperwork, Aspect promises a one-hour emergency response, AllStar Air Conditioning suits Daikin installs that also need electrical work, ADK Kooling suits public-sector buildings, and Hamilton Air Conditioning suits smaller North London offices.
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 inspect any installation or speak to clients.
Who qualified: London-based firms that install and maintain commercial air conditioning and either mention server rooms or offer the emergency cover server rooms need.
What we compared: server room design features (monitoring, alarms, redundancy), emergency response and prioritisation, temporary cooling, out-of-hours working, and maintenance.
Sources: each company’s own website. Response times are company targets.
How we ordered it: Be Cool Refrigeration is first as the sponsored featured pick. The rest are ordered by how directly their published services address server room cooling. We did not use a scoring model.
At a glance: server room AC in London
| # | Company | Strongest fit | Main differentiator | Pricing basis | Key consideration |
| 1 | Be Cool Refrigeration (featured, sponsored) | Offices with critical comms rooms | Monitoring, alarms and redundancy; server rooms prioritised | Free survey; servicing from £250 for one unit | Emergency same-day subject to availability |
| 2 | The Air Conditioning Company | Server rooms needing a stopgap | Same-day portable hire in London | Hire from £39.50 per week + VAT | No repair response time stated |
| 3 | JP Air Conditioning | Managed office buildings | Out-of-hours installs; RAMS per job | Quote within 48 hours | Weekday office hours |
| 4 | Aspect | Sites wanting fast attendance | 1-hour emergency response promise | From £63 per half-hour + VAT | Generalist firm |
| 5 | AllStar Air Conditioning | Daikin installs with electrics | Electrical and integration services | Prices not listed | Daikin only |
| 6 | ADK Kooling | Public-sector buildings | ProcurePublic framework partner | Quote within 48 hours | Two addresses on site |
| 7 | Hamilton Air Conditioning | Smaller North London offices | VRV/VRF and cassette range | Free consultation | No certifications named |
All details are company-stated, checked 8 October 2026.
1. Be Cool Refrigeration | Our featured pick for London offices whose server room cannot go down
Overview
Be Cool Refrigeration is a London air conditioning and refrigeration contractor based on Ludgate Hill, EC4, which says it has worked in the trade since 2004. For server and comms rooms it provides precision cooling with temperature and humidity monitoring, high-temperature alarms and redundancy options to protect IT equipment.
The same firm installs and maintains the office’s general air conditioning, from ceiling cassettes to VRF and water-cooled systems, and runs 24/7 emergency callouts in which server rooms, restaurants and other critical environments are prioritised for same-day visits. Its engineers carry common parts and refrigerant to fix most faults in one trip.
Key details
- Core offering: server room cooling design and installation, emergency repair, planned maintenance, wider office AC.
- Coverage: Greater London and inside the M25; South East for larger commercial projects.
- Customer fit: offices, co-working spaces, clinics and any business with an on-site comms room.
- Pricing and terms: free site survey; installation warranty up to 7 years; servicing from £250 for one unit, £145 per unit for two to three; repair diagnostic fee credited to the repair.
Where Be Cool Refrigeration stands out
It designs for failure, not just for cooling. Redundancy means a second unit can carry the load if the first fails, and high-temperature alarms warn someone before equipment overheats. Those two features are what separate server room cooling from putting a wall split in a cupboard.
Its emergency service triages by risk. Be Cool says server rooms are among the critical sites prioritised for same-day callouts, and stocked vans raise the chance of a first-visit fix. For a business whose phones, files and card payments run through one room, that prioritisation matters.
What to consider
Same-day emergency attendance is “subject to engineer availability”, with no fixed hour target, and the diagnostic fee is not published. Install timelines for commercial systems are stated differently in two places on its site, so agree a written programme.
Best fit
Offices with a comms or server room that want it designed with alarms and redundancy, maintained, and prioritised in an emergency, by the same contractor that cools the rest of the building.
Website: becoolrefrigeration.co.uk
2. The Air Conditioning Company | Best for server rooms that need a same-day stopgap
Overview
The Air Conditioning Company is the trading name of Airconco UK Ltd, based at Bittacy Business Centre, Mill Hill East, NW7, and it says it was founded in 1986. It lists server rooms among the business sectors it installs, repairs and maintains fixed air conditioning for, across Greater London and the Home Counties.
It also runs a portable unit sale and hire business with same-day hire delivery in London. Hire units range from a 2.6kW model at £39.50 per week to a 6.1kW unit at £229 per week, both excluding VAT.
Key details
- Core offering: fixed AC installation, repair and maintenance; portable hire and sale.
- Coverage: Greater London and the Home Counties.
- Customer fit: offices, server rooms, schools and healthcare sites.
- Pricing and terms: free site survey; fixed-system prices not listed; 10-year installation warranty (company-stated).
Where The Air Conditioning Company stands out
It can bridge a failure. If a server room unit fails and a part will take days, same-day portable hire keeps temperatures down while the repair is arranged. Published hire prices let you budget the stopgap immediately.
It has a long record and many reviews: Trustpilot 4.9 from 607 reviews and Google 4.6 from 211, shown on its homepage on 8 October 2026.
What to consider
No repair response time or 24/7 repair cover is stated, and the site does not describe server room features such as alarms or redundancy. Ask how it would design for both.
Best fit
Offices that want a long-established installer with portable cooling available the same day if the server room unit fails.
Website: airconco.com
3. JP Air Conditioning | Best for managed office buildings that need out-of-hours work
Overview
JP Air Conditioning, which names JP Air Conditioning Services Ltd in its warranty terms, is based on Homesdale Road in Bromley, BR2. It designs, supplies, installs and commissions commercial air conditioning across Greater London, including the City and Canary Wharf, and says it has more than 15 years’ experience.
It fits cassettes, multi-split wall units, VRF, ducted and internal water-cooled systems, describes itself as a Daikin Business Partner, and names Engie as a client in a case study.
Key details
- Core offering: commercial AC design, installation, maintenance and emergency call-outs.
- Coverage: Greater London with a South East focus.
- Customer fit: offices in managed buildings.
- Pricing and terms: free survey; quote within 48 hours; parts warranty up to 7 years with JP servicing.
Where JP Air Conditioning stands out
It installs out of hours, which matters for server rooms: swapping or adding cooling while systems are live is safer at night or at weekends, when IT teams can plan around it.
It provides risk assessments and method statements for each job, which managed office buildings usually require before contractors enter plant or comms rooms.
What to consider
Listed hours are weekdays 9am to 5pm, though out-of-hours calls are answered and the footer claims 24/7. The site does not describe server room monitoring or redundancy; ask.
Best fit
Offices in managed buildings in the City, Canary Wharf or South East London that need server room work done out of hours with full paperwork.
Website: jpaircon.com
4. Aspect | Best for sites that want the fastest stated emergency response
Overview
Aspect Maintenance Services Limited, trading as Aspect, is a multi-trade maintenance company based in Chessington, KT9, covering all 32 London boroughs. Its air conditioning engineers install, repair and maintain AC and heat pumps, licensed for brands including Daikin, Mitsubishi Electric, Fujitsu and Toshiba.
It promises a callback within 15 minutes and a one-hour response for emergency calls, with 24/7 support, and lists F-Gas via Refcom, BESA, NAPIT, CHAS, ISO 9001 and SafeContractor.
Key details
- Core offering: AC repair, maintenance and installation; electrical and other trades.
- Coverage: all London boroughs and inside the M25.
- Customer fit: small offices, clinics and landlords.
- Pricing and terms: from £63 per half-hour plus VAT, one-hour minimum; no parking or ULEZ charges; 12-month guarantee.
Where Aspect stands out
Its emergency target is the most specific we found. A one-hour response with a 15-minute callback suits a small office whose single comms cupboard unit has just tripped.
It also has electricians, useful when a server room cooling fault turns out to be a supply or circuit problem.
What to consider
Aspect is a generalist with a 12-month guarantee. For designing a resilient server room with redundancy, compare with a specialist installer.
Best fit
Small offices that want fast emergency attendance on an existing comms room unit, with electricians available on the same account.
Website: aspect.co.uk
5. AllStar Air Conditioning | Best for Daikin installs that also need electrical work
Overview
AllStar Air Conditioning is a London installer that describes itself as a Daikin accredited installer and a Daikin D1+ partner. It designs, installs, services and repairs Daikin systems for offices, shops, schools and leisure buildings.
It also offers integration and automation systems, TM44 inspections, refrigerant leak detection and a range of electrical services including wiring, testing and certification. Its homepage shows Google 5.0 from 149 reviews, checked 8 October 2026.
Key details
- Core offering: Daikin AC design and installation; electrical and ventilation services.
- Coverage: London.
- Customer fit: offices and commercial fit-outs.
- Pricing and terms: online quote form; prices not listed; warranties up to 7 years via Daikin.
Where AllStar Air Conditioning stands out
Electrics and controls are in-house. Server room cooling often needs a dedicated circuit and integration with building controls or alarms; AllStar lists both electrical contracting and automation.
Daikin partner status gives access to longer manufacturer warranties.
What to consider
It works only with Daikin, publishes no address or company name, and does not describe server room redundancy or response times.
Best fit
Office fit-outs using Daikin that want the cooling, dedicated electrics and controls installed by one firm.
Website: allstar-aircon.co.uk
6. ADK Kooling | Best for public-sector buildings
Overview
ADK Kooling, which names A-D-K Kooling Ltd (company number 05851592), installs and maintains air conditioning, refrigeration and ventilation across Greater London, Kent and Surrey. It says it has 15 years’ experience and is F-Gas certified.
It fits wall-mounted, ducted and water-cooled systems, offers planned preventive maintenance and out-of-hours work, and says it is a ProcurePublic framework partner with projects up to £500,000.
Key details
- Core offering: AC installation and PPM; ventilation; refrigeration.
- Coverage: Greater London, Kent and Surrey.
- Customer fit: schools, councils and public-sector offices.
- Pricing and terms: free survey; quote within 48 hours; no published prices.
Where ADK Kooling stands out
Public buyers can appoint it through a framework, which can be faster than tendering for a school or council comms room upgrade.
Water-cooled systems suit buildings where an outdoor condenser for the server room is not allowed.
What to consider
The site lists two addresses and two warranty versions, gives no response time, and does not describe server room monitoring.
Best fit
Public-sector buildings that want to appoint a contractor through a framework.
Website: adk.co.uk
7. Hamilton Air Conditioning | Best for smaller North London offices
Overview
Hamilton Air Conditioning Ltd is based at Churchill House, Mill Hill, NW7, and installs, maintains and repairs air conditioning and ventilation for offices, shops and homes. It fits split and multi-split systems, ducted units, ceiling cassettes, water-cooled systems and VRV/VRF.
It claims 24/7 support, describes itself as an authorised Daikin and Mitsubishi installer, and states a 5-year installation warranty.
Key details
- Core offering: AC installation, maintenance, repair and ventilation.
- Coverage: London, with a North London focus.
- Customer fit: small and medium offices.
- Pricing and terms: free consultation; finance mentioned.
Where Hamilton Air Conditioning stands out
A plainly stated 5-year warranty and finance options can help a small business add dedicated comms room cooling without a large upfront cost.
Its North London base suits offices in Mill Hill, Barnet and nearby areas.
What to consider
No certification bodies, response times or server room features are published.
Best fit
Smaller North London offices adding a dedicated unit to a comms cupboard.
Website: hamiltonaircon.com
What to ask about server room cooling
- Is there redundancy? Ask whether a second unit can carry the load if one fails.
- How will you know it has failed? High-temperature alarms should alert someone before equipment shuts down.
- Is the unit designed to run all year? Server rooms need cooling in winter too; check the system’s low-ambient operation.
- What is the emergency plan? Ask how server room calls are prioritised and whether temporary cooling is available.
- How often will it be serviced? Continuous-duty systems need more frequent servicing than office comfort units.
Frequently asked questions
Can I use a normal split unit for a server room?
For a small comms cupboard, sometimes. Larger rooms need cooling sized for constant heat output, year-round operation, alarms and ideally a backup unit.
What happens if the server room AC fails at night?
Be Cool Refrigeration prioritises server rooms in its 24/7 emergency service, and Aspect promises a one-hour emergency response. If a part is delayed, The Air Conditioning Company hires portable units with same-day delivery.
How often should server room AC be serviced?
Be Cool Refrigeration recommends twice a year for commercial systems in constant use, which describes most server rooms.
How much does servicing cost?
Be Cool Refrigeration publishes £250 for one unit and £145 per unit for two to three units, checked 8 October 2026. Indoor and outdoor units are counted separately.
The bottom line
For London offices that want a server room designed with alarms and redundancy, maintained on a schedule, and prioritised in an emergency, Be Cool Refrigeration is our featured pick. Keep The Air Conditioning Company’s portable hire in mind as a stopgap, compare JP Air Conditioning for out-of-hours work in managed buildings, and Aspect if a one-hour emergency response is the priority.
