| AIP Painting & Decorating Contractors Limited | Lancashire | 2007 |
| Aipconstruct Ltd | London | 2025 |
| Aipet Investments Ltd | London | 2023 |
| Air & Land Construction Ltd | Uxbridge | 2022 |
| Air & Solar SW Ltd | Bristol | 2022 |
| Air - Tech (Yorkshire) Limited | Ripon | 2010 |
| Air 2 Heat Renewable Energy Ltd | Southampton | 2022 |
| Air 2 Limited | Braintree | 2025 |
| Air 2 O Limited | Ruislip | 2009 |
| Air 3 Group Limited | Rickmansworth | 2026 |
| Air 3 Limited | Kings Langley | 2001 |
| Air Ability Limited | Wigston | 2007 |
| Air Abode Ltd | King'S Lynn | 2019 |
| Air Advanced Ltd | Woking | 2019 |
| Air AGE (UK) Limited | Ilford | 2016 |
| Air and Fire Limited | Andover | 2018 |
| Air and Fluid Systems Limited | Chelmsford | 2011 |
| Air and Housing Ltd | Sheffield | 2025 |
| Air and Sound Compliance Ltd | Uxbridge | 2022 |
| Air Andy’S Industrial Roofing Ltd | Southampton | 2026 |
| Air Assist Drone Surveys Limited | Scarborough | 2025 |
| Air Assistance Limited | Leicester | 2008 |
| Air Associates Limited | Hampton | 1967 |
| Air Brickwork Ltd | Luton | 2024 |
| Air Building & Electrical Contractors Ltd | Orpington | 2007 |
| Air Building Consultancy Limited | London | 2023 |
| Air Building Services Ltd | Sheffield | 2026 |
| Air Cair Engineering Limited | Norfolk, | 1996 |
| Air Care Services (Fareham) Limited | Fareham | 2007 |
| Air Centric Facilities Limited | Sheffield | 2018 |
| Air Centric Ventilation Limited | Sheffield | 2021 |
| Air Change Ltd | Inverness | 2015 |
| Air Climate Conditioning Limited | Lincoln | 2018 |
| Air Cold UK Ltd | Walton-On-Thames | 2021 |
| Air CON (Manchester) Limited | Stockport | 2013 |
| Air CON - 1 Ltd | Grantham | 2024 |
| Air CON Energy Solutions Ltd | Sapcote | 2011 |
| Air CON First Ltd | Wellingborough | 2023 |
| Air CON Install Ltd | Hornchurch | 2023 |
| Air CON Services (UK) Limited | Towcester | 2011 |
| Air CON Solutions Ltd | Haywards Heath | 2019 |
| Air Conditioner Ltd | London | 2019 |
| Air Conditioning & Electrical Services Limited | Honiton | 2002 |
| Air Conditioning & Engineering Services Limited | Maidstone | 2010 |
| Air Conditioning & Mech Services Ltd | Maidstone | 2015 |
| Air Conditioning & Refrigeration Services Limited | Tonbridge | 2010 |
| Air Conditioning & Smart Energy Solutions Ltd | Dunstable | 2022 |
| Air Conditioning & Ventilation (Surrey) Ltd | London | 2023 |
| Air Conditioning & Ventilation London Ltd | London | 2026 |
| Air Conditioning and Ventilation (UK) Ltd | Great Chesterford | 2014 |
| Air Conditioning Cardiff Ltd | Penarth | 2026 |
| Air Conditioning Design Limited | Manchester | 1988 |
| Air Conditioning Direct Limited | Horsham | 1995 |
| Air Conditioning Engineers Limited | Alcester | 1993 |
| Air Conditioning Essentials Ltd | Oldham | 2020 |
| Air Conditioning Essex Ltd | Rochford | 2023 |
| Air Conditioning London Limited | Hemel Hempstead | 2014 |
| Air Conditioning North East Limited | Stockton On Tees | 2024 |
| Air Conditioning Service & Installations Limited | Stafford | 2014 |
| Air Conditioning Services (GB) Limited | Chesterfield | 2005 |
| Air Conditioning Services (NW) Limited | Preston | 2006 |
| Air Conditioning Services (South) Limited | Southampton | 2010 |
| Air Conditioning Services (UK) Limited | Harrogate | 2013 |
| Air Conditioning Solutions Ltd | Darwen | 2020 |
| Air Conditioning South East England Ltd | Alfriston | 2022 |
| Air Conditioning South West Limited | Gloucester | 2016 |
| Air Conditioning Systems Wales Limited | Caerphilly | 2005 |
| Air Conditioning Ventilation Electrical Limited | Wembley | 2023 |
| Air Construction Ltd | Isleworth | 2013 |
| Air Control Building Services Limited | Matfield | 1993 |
| Air Control Engineering (UK) Limited | London | 2008 |
| Air Control Services Limited | Basingstoke | 2021 |
| Air Control Solutions Ltd. | Heywood | 2019 |
| Air Controlled Engineering Services Limited | Northampton | 1995 |
| Air Cool Engineering (N.I.) Ltd. | Aston | 1997 |
| Air Cool Engineering Systems Ltd | Aston | 2004 |
| Air Cool Environmental Ltd | Sevenoaks | 2002 |
| Air Cool Mechanical Services Ltd | Southampton | 2018 |
| Air Cool Solutions Ltd. | Birmingham | 2018 |
| Air Cooling and Heating Ltd | Chorley | 2019 |
| Air Cooling Limited | Broxbourne | 1999 |
| Air Cooling Products Ltd | Stockport | 2018 |
| Air Cooling Services Limited | London | 2008 |
| Air Cooling Solutions Ltd | Ware | 2007 |
| Air Cooling Systems Ltd | Kingsbury | 2024 |
| Air Decorators Limited | Ramsgate | 2023 |
| Air Design (Kent) Ltd | West Malling | 1999 |
| Air Design Systems Limited | Gateshead | 1993 |
| Air Developments Ltd | Glasgow | 2010 |
| Air Distribution Limited | Elland | 2010 |
| Air Ducts (Southern) Limited | Aldershot | 1992 |
| Air Ductwork Installation Limited | Crewe | 2014 |
| Air Efficient Ltd | Bristol | 2023 |
| Air Engineering Systems Limited | Forest Row | 1991 |
| Air Essence Ltd | Eltham | 2023 |
| Air FLO London Ltd | Wembley | 2020 |
| Air Flow Ductwork Limited | London | 2019 |
| Air Flow Innovations Ltd | Omagh | 2024 |
| Air Flow Services Limited | Hastings | 2006 |
| Air Force 1 (England) Ltd | London | 2019 |