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Mechanical & Electrical

Case Studies

From Retail Sites on the High Street, Commercial Installations through to Industrial Estates, DUNN AC have built an enviable reputation for delivering high quality projects on time, on specification and on budget.

The following is a small selection of the many case studies that have been completed successfully. Many more can be provided upon request.

Siemens

Siemens, Swanley, Kent

Dunn AC Limited were appointed by their client via a competitive tender process, to supply heat pump critical and comfort air conditioning to replace their end-of-life-cycle systems serving the entire building.

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HSBC

HSBC Maidenhead, Berkshire

Dunn AC Limited were appointed by their client to supply heat pump critical air conditioning to replace their end-of-life-cycle system serving the server rooms.

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Vodafone

Vodafone Hitchin, Hertfordshire

Dunn AC Limited were appointed by their client to supply heat pump critical air conditioning to replace their end-of-life-cycle system serving the shop floor customer area.

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HSBC

HSBC Lymington, Hampshire

Dunn AC Limited was appointed by their client as the contractor to complete major repairs to the sites critical cooling air conditioning system serving the server area.

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HSBC

HSBC Maidstone, Kent

Dunn AC Limited were appointed by their client to supply heat pump critical and comfort air conditioning to replace their failed system serving the entire branch over four floors.

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Superdrug

Superdrug The Shard Arcade, Southwark, London

Dunn AC Limited was appointed by their client as the contractor to complete major repairs to the sites critical cooling air conditioning system serving the shop floor areas.

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HSBC

HSBC Paddington, London

Dunn AC Limited were appointed by their client to supply heat pump critical air conditioning to replace their end-of-life-cycle system serving the cashiers area.

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Citco

Citco, Mayfair, London

Dunn AC Limited was appointed by their client as the contractor to carry out repairs to the whole building comfort cooling systems and replace the failed server room critical cooling system.

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Jardox logo

Jardox, Sevenoaks, Kent

Dunn AC were asked by their client to design and install provisions air purification throughout their production facility in Sevenoaks.

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TSB logo

TSB Tottenham, London

Dunn AC were instructed by our client to replace the failed critical cooling air conditioning systems serving the automatic teller machine room.

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HSBC logo

HSBC Whitechapel, London

Dunn AC Limited were appointed by their client to supply heat pump critical and comfort air conditioning to replace their failed system serving the entire branch.

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Paddy Power logo

Paddy Power, London and The Southeast

Dunn AC have been appointed by their client as the supplier to provide reactive air conditioning maintenance support to over 250 Paddy Power (PP) branches throughout London and Southeast England.

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HSBC logo

HSBC Lymington, Hampshire

Dunn AC Limited was appointed by their client as the contractor to complete major repairs to the sites critical cooling air conditioning system serving the branch server room.

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Telappliant

Telappliant, Brighton, West Sussex

Dunn AC were appointed to supply heat pump air conditioning to replace their current systems serving the whole building to coincide with a total building refurbishment project.

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Bedford NHS Trust logo

NHS Bedford Hospital Trust, Bedfordshire

Dunn AC Limited were appointed as the contractor to supply and carry out the installation of a new critical cooling system serving critical areas of the hospital.

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Natwest Group logo

NatWest Group - UK Nationwide

Dunn AC Limited have been instructed to support retail and commercial banking branches across their UK network of NatWest and RBS premises for the provisions of air conditioning, heating and ventilation service, maintenance and reactive emergency callouts.

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Barclays logo

Barclays Bank - Kingston-upon-Thames, Surrey

Dunn AC were instructed by our client to repair a failed and aged supply and extraction air handling system to serve the whole branch located within the plant room.

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Department for Business, Energy & Industrial Strategy logo

Department for Business, Energy and Industrial Strategy, London and nationwide

Dunn AC Limited was awarded, by way of a competitive tender process as a Crown Commercial Service provider.

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Liverpool Football Club logo

Liverpool Football Club, Liverpool, Merseyside

Dunn AC Limited was appointed by their client as the contractor to complete repairs to the sites critical cooling air conditioning system serving a critical client areas.

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Apple logo

Apple Inc. Southeast and Midlands

Dunn AC Limited was appointed by their client as the contractor to complete full air conditioning servicing and HVAC Covid-19 disinfectant regime and HEPA filter replacement to sites nationwide.

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HSBC logo

HSBC, London and Southeast

Dunn AC Limited was appointed by their client as the contractor to complete full F-Gas compliance inspections to all refrigerant systems.

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Southend University Hospital logo

Southend University Hospital, Southend, Essex

Dunn AC Limited were appointed by their client as the contractor to supply and carry out the installation of a new critical cooling system.

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NHS logo

South London & Maudsley NHS Foundation Trust, Maudsley Hospital, Lambeth, London

Dunn AC Limited were appointed by their client as the contractor to supply and carry out the installation of a new critical cooling system serving the server room area.

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NHS logo

South London & Maudsley NHS Foundation Trust, London and the South East

Dunn AC Limited was awarded a three year contract to supply reactive and mantenance services to all air conditioning and air handling assets across all trust properties.

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NHS logo

Basildon and Thurrock University Hospitals NHS Foundation Trust, Essex

Dunn AC Limited was awarded a three year contract to supply reactive and mantenance services to all air conditioning and air handling assets across all trust properties.

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Euro Tunnel logo

Euro Tunnel - Folkestone, Kent

Dunn AC Limited were appointed by their client as the contractor to supply and carry out the installation of a new critical cooling system serving a control office control tower located in EuroTunnel site in Folkestone, Kent.

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FA logo

The Football Association, St Georges Park, Burton-upon-Trent, Staffordshire

Dunn AC Limited were appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all air conditioning, air handling, natural gas, oil and LPG combustion assets across their property portfolio in Burton-upn-Trent, Staffordshire.

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NHS Southend logo

Southend University Hospital NHS Foundation Trust, Essex

Dunn AC Limited was awarded a three year contract to supply reactive and maintenance services to all air conditioning and air handling assets across all trust properties.

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Shell Energy

Shell Energy Birmingham, West Midlands

Dunn AC were instructed by our client to replace the failed comfort cooling air conditioning systems serving office areas.

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Leonardo Energy

Leonardo Group - South & Southeast England

Dunn AC Limited were appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all air conditioning, chillers and air handling assets across their properties across the South and Southeast of England.

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Port of Dover logo

Port of Dover

Dunn AC Limited were appointed by their client as the contractor to supply and carry out the installation of a new critical cooling system serving the server room of the ports control tower located in the Eastern docks in Dover.

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National Trust logo

National Trust - Knole House, Sevenoaks, Kent

Dunn AC were instructed by their client to install a complete new heating circuit to the residential Hayloft Flat that dates to circa 850 years old.

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NHS logo

South London & Maudsley NHS Foundation Trust, London and the South East

Dunn AC were successful by way of a competitive tender process to supply and install circa 525kW of split, twin split and VRV AC systems across circa 25 clinical sites across London and the Southeast.

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UKPN logo

UKPN - Bury St Edmunds, Suffolk

Dunn AC were instructed by their client to carry out the supply and installation of 4X Reznor high level space heaters, flues and controls to serve the large warehouse area used to store essential supplies.

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Santander logo

Santander UK - Queen Mary University, Whitechapel, London

Dunn AC were instructed by our client to replace the failed comfort cooling air conditioning systems serving the whole branch.

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Sky UK logo

Sky UK - Isleworth, Middlesex

Dunn AC were instructed by our client to design and install a new extraction air handling system to serve the main kitchen canopy which was using a shared AHU but not effectively.

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Regus logo

Regus PLC, London

Dunn AC Limited was re-appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all air conditioning, air handling, natural gas, oil and LPG combustion assets across their property portfolio in Central and Greater London.

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TNT logo

TNT Logistics Leicester, Leicestershire

Dunn AC Limited were appointed by their client as the contractor to replace the failed gas fired wet heating system serving the heating and hot water throughout the office space in the distribution building.

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HSBC logo

HSBC Croydon, Surrey

Dunn AC were appointed by their client to supply heat pump air conditioning to replace their failed system serving the banking hall, cashiers, personal banking offices comms and staff rooms throughout the branch.

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Carpetright logo

Carpet Right - UK Nationwide

Dunn AC was appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all high level natural gas, oil & LPG combustion assets across their property portfolio nationwide.

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Sky UK logo

SKY UK - Leeds, West Yorkshire

Dunn AC was appointed by their client as the contractor to complete repairs to the sites critical cooling air conditioning systems serving a 80% of the building.

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Ministry of Justice logo

Ministry of Justice - Norwich County Court, Norfolk

Dunn AC was appointed by their client as the contractor to complete the installation of a replacement of 585kW, 909L of natural gas fired water heaters, pipework, controls and flues serving the complete court building.

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DHL logo

DHL UK Nationwide reactive maintenance supplier

Dunn AC Limited was awarded, by way of a competitive tender process, a three year contract to supply reactive and mantenance services to all air conditioning, combustion and air handling assets across their properties

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UKPN logo

UK Power Networks, Notting Hill Gate, London

Dunn AC Limited was appointed by their client as the contractor to complete the installation of circa 275.0kW of comfort and critical cooling to a new office facility and sub station following the refurbishment of the site and occupancy of UKPN.

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Volvo logo

Volvo Truck & Bus - Croydon, Surrey

Dunn AC Limited was appointed by their client as the contractor to replace the aged failed natural gas fired boilers, pipework, controls and flues serving the entire building including offices, receptions, work shops and stores.

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Sky UK logo

SKY UK - Newcastle upon Tyne, Northumberland

Dunn AC were appointed as the contractor to replace the faulty air conditioning systems serving the studio offices following an emergency call out for a faulty systems.

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HSBC logo

HSBC Wimbledon, London

Dunn AC Limited were appointed by their client to supply heat pump air conditioning to replace their failed system serving the banking hall, cashiers, personal banking offices and comms room throughout the branch.

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Sky logo

Sky PLC - UK Nationwide Reactive Maintenance Supplier

Dunn AC Limited was appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all air conditioning, combustion and air handling assets across their properties Nationwide.

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National Trust logo

National Trust - Knole House, Sevenoaks, Kent

Dunn AC were appointed the contractor to carry out complete asset management and detailed validation reports across the vast four acres Knole House Buildings Estate.

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Superdrug logo

Superdrug Distribution facility - Pontefract, West Yorkshire

Dunn AC Limited was appointed by their client as the contractor to complete repairs to the sites critical cooling air conditioning system serving a large goods distribution facility.

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Ministry of Justice logo

MOJ Bury-St-Edmunds Combined Court, Suffolk

Dunn AC Limited was appointed by their client as the contractor to complete the installation of a replacement of 1,200kW of natural gas fired boilers, pipework, controls and flues.

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Jardox, Sevenoaks logo

Jardox, Sevenoaks

Dunn AC Limited was appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all air conditioning, refrigeration and air handling assets across their business property.

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Southwark Crown Court, London logo

Southwark Crown Court, London

Dunn AC were appointed as the contractor to replace the faulty air conditioning systems serving court areas.

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HSBC logo

HSBC Piccadilly, London

Dunn AC were appointed as the contractor to replace the faulty air conditioning systems serving the customer areas.

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UK Power Networks logo

UK Power Networks, Hannibal House, Elephant & Castle, London

Dunn AC were appointed as the contractor to de-commission and remove 125.0kW of relatively new split and multi split air conditioning systems as a result of the the Hannibal House and Elephant & Castle Shopping Centre complex being regenerated.

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Barclays Bank logo

Barclays Bank, Thatcham, Berkshire

Dunn AC were appointed as the contractor to repair the complete building comfort and critical cooling/heating air conditioning system.

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Freedom Infrastructure Services logo

Freedom Infrastructure, Ipswich, Suffolk

Dunn AC were appointed as the contractor to repair the complete building heating system following fault diagnoses.

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Brett Group logo

Brett Group, Aylesford, Kent

Dunn AC were appointed as the contractor to replace the faulty air conditioning systems serving the operations office.

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NHS logo

South London & Maudsley NHS Foundation Trust, London

Dunn AC Limited was re-appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all server and critical cooling air conditioning and air handling assets across their trusts hospital property portfolio.

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Freedom Infrastructure Services logo

Freedom Infrastructure Services, London/Southeast/East Anglia

Asset Management of all M&E/fire fighting/emergency lighting/fire panels/first aid assets across UKPN property portfolio.

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Regus logo

Regus, Southampton Row, London

Dunn AC were appointed the contractor to replace numerous branch selector (BS) boxes throughout the building that had failed.

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HSBC logo

HSBC, Worthing

Dunn AC were appointed the contractor to replace the failing up-flow critical cooling units serving their main server room.

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Bel UK logo

Bel UK, Sevenoaks

Dunn AC Limited was appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all air conditioning, heating and ventilation assets across their business properties.

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Pets Corner logo

Pets Corner, Crawley

Supply and installation of new complete building AHU system.

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Essex & Suffolk Water logo

Essex & Suffolk Water

Maintenance and call out service contract

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Southern Rail logo

Southern Rail, Croydon Data Centre

Installation of 75kW of critical cooling to the main server room.

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Wettons logo

Wettons, Sevenoaks

Appointed as the HVAC contractor to supply and install a new comfort and critical cooling air conditioning systems to their new offices and comms room.

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Pyramids Shopping Centre logo

Pyramids Shopping Centre, Birkenhead

Dunn AC Limited was appointed by their client as the contractor to carry out de-commissioning, removal and disposaSantanderl of redundant air conditioning, heating and ventilation plant.

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Regus logo

Regus - Austin Friars, London

Dunn AC Limited was appointed by their client as the contractor to carry out the complete refurbishment of the whole building air handling ventilation system.

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UK POwer Networks logo

UKPN Frant

Dunn AC Limited was appointed by their client as the contractor to carry out the installation of 24kW of comfort cooling to the training suite in Frant.

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Allianz logo

Allianz - Guildford, Surrey

Dunn AC Limited was appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all air conditioning and air handling assets across their business property.

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HSBC logo

HSBC Canterbury

Dunn AC Limited were appointed by their client to supply heat pump air conditioning to replace their failed system serving the banking hall, cashiers, personal banking offices and comms room throughout the branch.

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Facebook logo

Facebook Inc. Fitzrovia, London

Dunn AC Limited was appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all air conditioning & air handling assets across their property in Fitzrovia, Central London.

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Amazon logo

Amazon UK - Holborn, London

Dunn AC Limited was appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all data centre down-flow, critical cooling systems in Fitzrovia, Central London.

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Inmarsat logo

Inmarsat - Shorditch, London

Dunn AC Limited was appointed by their client as the contractor to replace the failed DX condensers serving 5th floor air handling unit. Two new Airedale DX condensers were selected, supplied and installed and linked to the site BMS system.

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Warner Bros logo

Warner Bros - Warner House, Theobalds Road, Holborn

Dunn AC Limited was appointed by their client as the HVAC contractor to supply and install a new air conditioning system to serve the 8th and 9th floor offices and 7th floor comms area.

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Regus PLC logo

Regus PLC London

Dunn AC Limited was appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all air conditioning , air handling, natural gas, oil and LPG combustion assets across their property portfolio in Central and Greater London.

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xxxxx logo

Jones Lang LaSalle - Southeast England

Dunn AC Limited was appointed by their client as the contractor to complete natural gas servicing to air and convection combustion heating systems across their property portfolio.

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UKPN logo

UKPN East Anglia and The Southeast

Dunn AC Limited was appointed by their client as the contractor to complete full periodic quarterly planned maintenance to all air conditioning , air handling, natural gas, oil and LPG combustion assets across their property portfolio

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Sea Drill logo

Sea Drill - Chiswick Park

Dunn AC Limited was appointed as the HVAC contractor to supply and install a new air conditioning system to serve the open plan office space and critical cooling areas throughout.

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Gatwick Airport logo

Valet office - Gatwick Airport North Terminal

Dunn AC Limited was appointed as the HVAC contractor to supply and install a new air conditioning, ventilation, heat recovery ventilation and air curtain heater systems to serve a new valet parking office situated within the on-site car park at Gatwick Airports North terminal.

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HSBC logo

HSBC - Hammersmith

Dunn AC Limited was appointed as the HVAC contractor to supply and install a new air conditioning system added to their current VRV system to serve critical and comfort cooling to the comms room, back office and canteen areas.

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Swan Walk Shopping Centre Horsham

Dunn AC Limited were asked by our client to complete a new installation of a cooling/heating system serving the management suit.

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Barclays Bank, Cambridge

Dunn AC limited were asked by their client to supply replacement NG heating system for there failing aged system on site.

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H Samuel Eastleigh Southampton

Dunn AC limited were asked by their client to supply a replacement cooling system for their failing aged system on site.

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Velocity V1 Brooklands, Weybridge

Dunn AC Limited were asked by our client to be the main HVAC contractor to carry out the refurbishment of Velocity V1 building on the prestigious Brooklands Estate.

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Barclays Bank Tower Exchange, Canary Wharf

Following an emergency call out attendance by Dunn AC Engineers it was identified that the main chiller plant serving the clients emergency crash suite and IT department had failed components.

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Virgin Atlantic Ticket Office, Gatwick Airport, North Terminal

Dunn AC were asked by their client to carry out the supply & installation of a new cooling system serving the Virgin Atlantic Ticket office located at Gatwick Airport, North Terminal.

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Barclays Bank Canterbury

To replace all natural gas fired boilers to site with new condensing type systems.

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Warner Bros De Lane Lea Studios Soho

Design, supply and installation of 160kW of comfort cooling to the new recording and design area

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Barclays Bank Borehamwood

Branch refurbishment carried out by Dunn AC Limited.

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Bethlem Hospital Beckenham

To carry out a refurbishment of main trusts comms room to replace critical cooling systems within a 'live' environment.

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Barclays Bank Thornbury Bristol

Branch refurbishment carried out by Dunn AC Limited following 'gas attack' to external ATM's.

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DHL Barking

Design, supply and installation of 18X split and multi split air conditioning systems providing comfort cooling to all areas of the distribution building.

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EnjoyWork Chiswick Park

Design, supply and installation of 2X chilled water pressurisation systems to work along side the existing Trane chillers serving building 3 & 4 carried out by Dunn AC Limited.

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Some of our recent clients:

Our accreditations:

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