• A Avi Jacob
  36 Grimsdyke Road, PINNER, Middlesex, HA5 4PW
• A C Direct
  Stable Yard 65 Albert Road, South Woodford, LONDON, Greater London, E18 1LE
• Accc Air Conditioning
  Howard Close Business Park, WALTHAM ABBEY, Essex, EN9 1XB
• Acs Environmental UK Ltd
  Caxton Point, Caxton Way, STEVENAGE, Hertfordshire, SG1 2XU
• Adcock Refrigeration & Air Conditioning Ltd
  10 Brownfields, WELWYN GARDEN CITY, Hertfordshire, AL7 1AN
• Air Consultants & Refrigerators
  Kings Cottage, Starlings Green, Clavering, SAFFRON WALDEN, Essex, CB11 4PP
• Air Cool Engineering Service & Maintenance Ltd
  Aston Bury Farm, Aston Bury Lane, Aston, STEVENAGE, Hertfordshire, SG2 7EG
• Air Cool Engineering Systems Ltd
  Aston Bury Farm, Aston Bury Lane, Aston, STEVENAGE, Hertfordshire, SG2 7EG
• Aircon Doc
  51 Cunningham Avenue, ENFIELD, Middlesex, EN3 6LB
• Aircon Installations Ltd
  132 Morton Way, LONDON, Greater London, N14 7AL
• All Cool Air Conditioning Services
  66 Yukon Road, BROXBOURNE, Hertfordshire, EN10 6FN
• Alpha Air Conditioning UK Ltd
  61 Blakemere Road, WELWYN GARDEN CITY, Hertfordshire, AL8 7PQ
• Appliance Breakdown Service Ltd
  1 Pages Close, BISHOP'S STORTFORD, Hertfordshire, CM23 4HP
• Arctic Building Services Ltd
  138 Gallants Farm Road, East Barnet, BARNET, Hertfordshire, EN4 8EL
• Artel
  Unit 1 Kingstons Farm, Matching Lane, White Roding, DUNMOW, Essex, CM6 1RP
• Avi Jacob
  36 Grimsdyke Road, PINNER, Middlesex, HA5 4PW
• B&N Refrigeration & Airconditioning Ltd
  28 St.Thomas Drive, PINNER, Middlesex, HA5 4SS
• Benson Refrigeration Ltd
  Kings Cottage, Starlings Green, Clavering, SAFFRON WALDEN, Essex, CB11 4PP
• Boonbest Ltd
  43 Park Lane, BROXBOURNE, Hertfordshire, EN10 7NG
• Brifrost Engineering
  9 The Drive, Wheathampstead, ST ALBANS, Hertfordshire, AL4 8LE
• Ceilite Air Conditioning Ltd
  1 The Alcorns, Cambridge Road, STANSTED, Essex, CM24 8DF
• Climate Control South-Ea
  Unit 6 The Enterprise Centre, Cranborne Road, POTTERS BAR, Hertfordshire, EN6 3DQ
• Comfort Cooling Installations
  78 Woodland Road, LONDON, Greater London, E4 7EU
• Coolbusters
  44 Great Plumtree, HARLOW, Essex, CM20 2NT
• Cpi Solutions Ltd
  71 School Lane, WELWYN, Hertfordshire, AL6 9PL
• Cryotec Air Conditioning
  4 Netherpark Drive, ROMFORD, Essex, RM2 5RL
• Cyclone Commerce
  3c Standon Business Park, Stortford Road, Standon, WARE, Hertfordshire, SG11 1PH
• D & T Vehicle
  8 Windmill Lane, Bushey Heath, BUSHEY, Hertfordshire, WD23 1NH
• DS Ducts Ltd
  The Fulling Mill, Fulling Mill Lane, WELWYN, Hertfordshire, AL6 9NP
• Direct Commissioning Services
  8 Ashfields, LOUGHTON, Essex, IG10 1SB
• Eagle Systems
  11 Stapylton Road, High Barnet, BARNET, Hertfordshire, EN5 4JJ
• Eastern Fabrications
  3 Horsecroft Place, HARLOW, Essex, CM19 5BT
• Easton Fabrications
  3 Horsecroft Place, HARLOW, Essex, CM19 5BT
• Environmental Resolutions UK Ltd
  2 Bury Road, HATFIELD, Hertfordshire, AL10 8BJ
• Essentail Environ Essential Envi
  43 Knowl Piece, Wilbury Way, HITCHIN, Hertfordshire, SG4 0TY
• Fujitsu General UK Co Ltd
  Unit 150 Centennial Park, Centennial Avenue, Elstree, BOREHAMWOOD, Hertfordshire, WD6 3SG
• Future Electrical Services Ltd
  1 Alsa Business Park, Alsa Street, STANSTED, Essex, CM24 8SQ
• George S Industrial Services Ltd
  49 Theobald Street, BOREHAMWOOD, Hertfordshire, WD6 4RZ
• Industrial Air Conditioning Ltd
  3 The Old Mill, Mill Lane, Watton at Stone, HERTFORD, Hertfordshire, SG14 3TB
• Mac Air Conditioning Ltd
  Unit 11 Maple Park, Essex Road, HODDESDON, Hertfordshire, EN11 0EX
• Marsden
  39 Kimberley Road, LONDON, Greater London, E4 6DF
• Metair Mechanical Services Ltd
  Unit 21d Queensway, ENFIELD, Middlesex, EN3 4SZ
• Micra Air Conditioning Services
  9 Vicarage Road, WOODFORD GREEN, Essex, IG8 8NH
• Morris & Young
  5 Ash Industrial Estate, Flex Meadow, HARLOW, Essex, CM19 5TJ
• Pinner Air Conditioning Ltd
  28 St.Thomas Drive, PINNER, Middlesex, HA5 4SS
• Quentrall Air Conditionin
  597 High Road, LONDON, Greater London, N12 0DY
• Question Air
  25 Hatfields, LOUGHTON, Essex, IG10 1TJ
• Quintessential Kitchens Ltd
  43 Knowl Piece, Wilbury Way, HITCHIN, Hertfordshire, SG4 0TY
• R E M
  162 Chase Cross Road, ROMFORD, Essex, RM5 3UU
• S B H Design & Installation Services Ltd
  319 Ballards Lane, LONDON, Greater London, N12 8LY
• S Johnson
  44 Mulberry Way, HITCHIN, Hertfordshire, SG5 2TB
• Stonegrove Refrigeration Services
  D6 The Seedbed Centre, HARLOW, Essex, CM19 5AF
• Swegon Ltd
  Astra Centre, Edinburgh Way, HARLOW, Essex, CM20 2BN
• T2 Building Servicesd Ltd
  Unit 164 Lea Valley Technopark, Ashley Road, LONDON, Greater London, N17 9LN
• Thermacool Refrigeration & Airconditioning Ltd
  92 Axholme Avenue, EDGWARE, Middlesex, HA8 5BG
• Weatherman Airconditioning Ltd
  10 Roscoff Close, EDGWARE, Middlesex, HA8 0BY