HVAC Companies Using reCAPTCHA in the UK: 966 Active Firms (2026)
HVAC and refrigeration companies using website form-protection controls install, service and maintain climate systems across the UK.
For HVAC and refrigeration providers, reCAPTCHA usually sits at the edge of quote, call-out, maintenance and parts-enquiry journeys rather than inside the operational workflow. Its presence points to a business that expects inbound web demand, uses public forms for job triage or account enquiries, and has enough marketing or website support to maintain third-party scripts. Buying centres tend to sit between operations, sales administration and whoever owns the website, with relatively modest deployment work compared with field-service systems or finance software. The signal is less about digital sophistication in isolation and more about an active direct-channel posture.
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The UK adoption picture contains 966 actively trading HVAC and refrigeration companies running reCAPTCHA. Reported employment across the cohort is 2,489 people, giving the group a visible but mostly regional contractor footprint rather than a national-employer profile. Within detected security tools for this sector, reCAPTCHA ranks first, appearing in 92.7% of a sector denominator of 1,042. Registered-region skew is spread rather than London-centred: South East accounts for 16.7%, East of England 13.1%, London 12.4%, South West 11.5%, and North West 10.5%.
Contact-form protection is usually a low-value web procurement for this sector, often bundled into site maintenance rather than bought through a formal technology selection process. The compliance issue is practical: contact forms can collect names, phone numbers, job locations and fault descriptions, so contractors need clear notices, proportionate retention and a way to manage third-party scripts placed on quote or service-request pages. The vendor ecosystem also sits close to web-agency decisions; changes to hosting, analytics tags or form plugins may affect whether the control continues to load reliably.
Adoption appears tied to the persistence of public enquiry forms in HVAC and refrigeration, where prospects still ask for call-outs, maintenance quotes and replacement equipment through contractor websites. The stack tends to remain agency-managed, so change is more likely to come through website rebuilds, hosting moves and bundled security packages than through standalone security procurement. Some migration pressure may build where privacy review, form deliverability or accessibility concerns expose older implementations. Even so, the cohort looks practical rather than experimental: most users are likely to keep whichever control their web supplier supports unless spam volumes or lead quality force a change.
Adoption by company size
Adoption of reCAPTCHA rises with company size across the trading UK HVAC companies in this cohort. 2.7% of the 23,256 companies with under 10 employees run reCAPTCHA (628 detected). 26.5% of the 1,144 companies with 10–50 employees run reCAPTCHA (303 detected). 33.7% of the 83 companies with over 50 employees run reCAPTCHA (28 detected). That is a 31% gap between the over 50 employees and under 10 employees bands.
966
Active firms
2026
92.7%
Of detected Security share
UK HVAC
7
Median headcount
Filed accounts
1,960
Verified contacts
Across this cohort
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Key facts
About 6% of the trading cohort reports turnover above £5M (59 of 966 firms) — the rest sits below that revenue band.
5% of the cohort was incorporated since 2022 (54 firms), so a sizeable share is in its first few filing cycles.
Among HVAC and refrigeration firms with a detectable website-security system, this form-protection control accounts for 92.7% (966) of 1,042 companies.
The regional distribution is weighted towards southern England: South East 16.7% (161), East of England 13.1% (127), London 12.4% (120), and South West 11.5% (111).
The website stack points to conventional service-business marketing: 81.5% (787) also run a content-management platform, 53.9% (521) use web analytics, and 30.1% (291) show contact-form tooling.
Sector tags overlap beyond HVAC’s core trade base, with Construction at 38.6% (373), Renewable Energy at 14.8% (143), and Wholesale & Distribution at 2.6% (25).
Financial-risk markers are not absent: 15.7% (152) are classified as weak, 3.8% (37) as distressed, and 2.0% (19) have insufficient history.
Security market share among UK HVAC
What else do reCAPTCHA-running HVAC run?
Share of the 966 reCAPTCHA-running UK companies where each technology was also detected. As of June 2026.
Where reCAPTCHA HVAC are, and how healthy they look
By region
By registered-office region; companies without a regional match count toward Rest of UK.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
7
Median headcount
£712.9K
Median UK turnover
6.1%
Above £5M turnover
54
Incorporated since 2022
1,960 verified decision-maker contacts
across these 966 companies, with emails available in Firmbase. Filter by role, seniority and stack.
Top UK HVAC using reCAPTCHA
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 5 filingsDesigns, installs and maintains HVAC and building services systems including air conditioning, refrigeration, chillers, ventilation, heating and electrical systems. Provides planned maintenance,…
Serves UK businesses, public-sector bodies and facilities managers with commercial sites, including healthcare providers, hospitals, offices, telecoms sites, sports venues and contractors requiring…
Financial Health
StrongStrong · Profitable, Growing, Hiring · 11% CAGR over 4y
Location
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Financial sub-scores
Computed from 2 filingsProvides installation, servicing, maintenance and repair of commercial air conditioning and refrigeration systems. Supplies HVAC equipment from major manufacturers and installs renewable heating and…
Serves business and organisational clients in Scotland, particularly those with commercial premises requiring HVAC, refrigeration support, and decarbonisation or net zero programmes.
Financial Health
StrongStrong · Hiring · 80% CAGR over 1y
Location
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Financial sub-scores
Computed from 5 filingsProvides commercial HVAC services including design, installation, maintenance and compliance auditing for air conditioning, refrigeration, ventilation and heating systems. Also installs air source…
Serves B2B customers across commercial sectors that operate HVAC, refrigeration, ventilation or heating equipment, including organisations needing to maintain compliant, reliable commercial spaces…
Financial Health
StrongStrong · Growing, Hiring · 33% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsInstalls, services and maintains commercial and industrial refrigeration and air conditioning systems. Provides cold storage and cold chain solutions and energy management services for sectors…
Serves UK businesses and institutions, including hospitality and catering operators, retailers, leisure venues, food manufacturers, healthcare providers, education sites, cold stores and distribution…
Financial Health
StrongStrong · Growing, Hiring · 82% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides HVAC system design, installation, servicing and maintenance for commercial and industrial buildings. Specialises in large chiller plant installation and replacement, energy management…
Serves B2B industrial and commercial building operators, construction and facilities maintenance teams, including data centres, across England and Wales with complex HVAC and energy management needs.
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, installs and maintains air conditioning, refrigeration and ventilation systems for domestic and commercial premises. Provides system planning, commissioning, repair and servicing, including…
Serves domestic homeowners, small businesses, large PLCs and local authorities nationwide, with customers in leisure, brewing, education, food manufacturing, banking, housing, construction and retail.
Financial Health
StrongStrong · Growing, Hiring · 16% CAGR over 4y
Location
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Computed from 5 filingsProvides commercial and industrial HVAC, air conditioning and refrigeration services, including system supply, installation, repair and maintenance. Also delivers electrical services, water chiller…
Serves commercial and industrial businesses in Lancashire and Cumbria, particularly facilities, engineering and maintenance teams responsible for HVAC, air conditioning, refrigeration and electrical…
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
Location
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Computed from 5 filingsDesigns, installs and maintains industrial and commercial refrigeration systems. Provides servicing, repair, spare parts supply, maintenance contracts and emergency call-outs for refrigeration, air…
Serves UK businesses using industrial or commercial refrigeration, air conditioning and heat exchange systems, including food and ingredient storage or sales operations needing process refrigeration…
Financial Health
StrongStrong · -3% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, installs and maintains industrial heating, ventilation and air conditioning systems. Supplies radiant heaters, boilers, warm air heating, extraction and input ventilation, and heat‑pump air…
Serves B2B customers with industrial and retail premises, including factories, workshops, warehouses, offices, shopping centres and showrooms across the UK.
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsProvides design, installation, maintenance and repair of commercial air conditioning and refrigeration systems. Services include HVAC systems, VRF units, chillers, ventilation, heat pumps, energy…
Serves B2B and public-sector clients needing commercial temperature-control support, including offices, facilities management partners, data centres, healthcare, hospitality, manufacturing, swimming…
Financial Health
StrongStrong · Growing, Hiring · 16% CAGR over 3y
Location
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Computed from 4 filingsProvides design, installation, servicing and preventative maintenance of air conditioning, ventilation and refrigeration systems. Offers ongoing system management and repair services, including…
Serves UK clients with air conditioning, ventilation and refrigeration requirements, particularly organisations managing HVAC systems that need lifecycle support and maintenance.
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 3y
Location
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Computed from 5 filingsProvides commercial and industrial HVAC services including design, supply, installation and commissioning of heating, ventilation and air conditioning systems. Also delivers maintenance, breakdown…
Serves commercial and industrial organisations with building and facilities needs, including businesses managing multi-system sites and large projects across London, the South East, South West and…
Financial Health
StrongStrong · Growing, Hiring · 35% CAGR over 4y
Location
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Computed from 5 filingsDesigns, installs and maintains air conditioning, refrigeration systems and heat pumps for commercial, industrial and residential properties. Provides servicing, breakdown repairs, and installation…
Sells to commercial, industrial and residential customers needing air conditioning, refrigeration and heat pump support, including buyers of cold rooms and temperature-controlled warehouses, mainly…
Financial Health
StrongStrong · Hiring · 22% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, fabricates, installs and maintains HVAC and mechanical building services systems. Produces packaged plant rooms, pump and heat exchange skids, and provides heating, cooling, refrigeration…
Serves commercial, industrial and public-sector clients nationwide, including data centres, waste-to-energy operators, hotels and leisure venues, education providers, utilities, food manufacturers,…
Financial Health
StrongStrong · Growing · 1% CAGR over 4y
Location
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Computed from 3 filingsDesigns, supplies and installs commercial refrigeration and air conditioning systems, including cold rooms, chillers and bespoke cooling solutions. Provides maintenance, inspections and repairs for…
Serves businesses needing refrigeration and climate-control systems, including retail, hospitality, industrial operators, food processors and data centres, plus residential customers requiring air…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 2y
Location
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Computed from 3 filingsProvides installation, servicing, maintenance and emergency repair of commercial air conditioning, refrigeration and ventilation systems. Also supplies equipment including kitchen refrigeration…
Serves UK commercial businesses needing refrigeration, air conditioning and ventilation support, including hospitality, catering and premises managers requiring kitchen refrigeration, bar fridges,…
Financial Health
StableStable · -4% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, supplies, installs and maintains commercial and industrial refrigeration and air‑conditioning systems. Provides process cooling, cold room and chiller installations, ventilation and…
Sells to businesses and some healthcare organisations needing commercial or industrial refrigeration, air conditioning and process cooling, including pharmaceutical, food and beverage, plastics,…
Financial Health
StableStable · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides maintenance, installation and repair services for heating, ventilation, air conditioning and refrigeration systems. Also delivers planned preventative maintenance, plumbing and pipe fitting,…
Serves building technical services firms and facilities/property management companies, plus commercial, residential, leisure and healthcare sites such as apartment complexes, offices, theatres and…
Financial Health
StableStable · -1% CAGR over 4y
Location
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Computed from 3 filingsProvides industrial and commercial refrigeration and air conditioning services including system design, installation, equipment hire, servicing and maintenance, with 24/7 breakdown support for…
Serves commercial and industrial businesses requiring refrigeration and air conditioning support, originally focused on Shropshire and now working with clients across England, Wales and Scotland.
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 2y
Location
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Computed from 5 filingsProvides installation, servicing, maintenance and repair of commercial and industrial HVAC systems, including air conditioning, heat pumps, warm air and water heating, and bespoke air handling…
Serves B2B and public-sector organisations in the Midlands, including offices, data centres, FM companies, manufacturers, logistics sites, healthcare providers, schools, councils, hospitality venues…
Financial Health
HealthyHealthy · -67% CAGR over 4y
Location
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Computed from 5 filingsProvides sales, installation, servicing and maintenance of commercial refrigeration and air conditioning systems, including walk-in fridges and freezers, cold rooms, ice machines and cellar cooling,…
Serves B2B customers, from large contracted organisations to independent locally owned businesses, primarily across the north of England, Midlands, Wales and Scotland.
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 4y
Location
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Computed from 4 filingsInstalls, services and repairs commercial and domestic air conditioning, refrigeration and HVAC systems. Provides system design, equipment installation, preventative maintenance contracts, and F‑Gas…
Serves commercial organisations and residential customers across the UK, including buyers responsible for air conditioning, refrigeration and HVAC systems, from smaller domestic needs to large-scale…
Financial Health
HealthyHealthy · Hiring · 4% CAGR over 3y
Location
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Computed from 3 filingsDesigns, installs and services commercial refrigeration and air conditioning systems. Provides cold rooms, bulk milk tanks, commercial catering equipment, refrigerated trailer hire, and maintenance…
Serves businesses across Devon, Cornwall and Somerset needing commercial refrigeration, air conditioning and catering equipment, including foodservice operators, retailers and dairy/agricultural…
Financial Health
HealthyHealthy · -5% CAGR over 2y
Location
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Computed from 5 filingsProvides mechanical and electrical building services including HVAC design and installation, plant room refurbishment, boilers, chillers and district heating systems. Also delivers energy management,…
Serves B2B clients managing built-environment assets, including commercial property owners, facilities managers, developers and operators of plant rooms, energy centres and district heating networks,…
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
Location
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Computed from 5 filingsProvides installation, maintenance and repair of air conditioning, commercial refrigeration, ventilation and air source heat pump systems. Designs and installs cold storage and cooling systems for…
Sells to commercial and industrial customers across the UK, including offices, warehouses, restaurants, hotels, laboratories and retail sites, plus some residential property owners needing heat pump…
Financial Health
HealthyHealthy · Growing · 2% CAGR over 5y
Location
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Computed from 3 filingsProvides commercial HVAC and refrigeration services including system design, installation, maintenance and servicing. Also undertakes mechanical and electrical installations, site surveys,…
Serves industrial, commercial and retail organisations, main contractors and domestic customers needing refrigeration, air conditioning, HVAC and mechanical services.
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
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Computed from 3 filingsInstalls, services and maintains refrigeration, heating and air conditioning systems for commercial vehicles and buildings. Provides cool room and freezer fit‑outs, auxiliary vehicle equipment,…
Sells primarily to B2B customers operating commercial vehicles and temperature-controlled facilities, including fleet operators, transport and cold-chain businesses, marine users, and organisations…
Financial Health
StrongStrong · Hiring · 15% CAGR over 2y
Location
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Computed from 5 filingsProvides design, installation, maintenance and repair of HVAC and air conditioning systems, ventilation, commercial plumbing and process pipework. Also installs UV air purification and other…
Serves public and private sector clients, including design-and-build contractors, main contractors, landlords, tenants and end users in commercial offices, education, healthcare, care homes,…
Financial Health
StrongStrong · Growing, Hiring · 16% CAGR over 4y
Location
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Computed from 5 filingsProvides installation, maintenance, repair, removal and WEEE-compliant disposal of commercial refrigeration display equipment. Also supplies spare parts, refrigerated cabinet and trailer hire, and…
Serves UK businesses using commercial refrigeration display equipment, particularly food retailers and organisations needing chiller or freezer capacity, cabinet maintenance, spare parts, and…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
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Computed from 5 filingsManufactures, supplies and refurbishes cold storage units and cold rooms. Provides rental and sales of new and used cold stores, refrigerated trailer hire, and refrigeration services including…
Serves UK businesses needing cold storage, including catering, mortuary, floristry, bakery, produce, healthcare, logistics, wholesale, meat, fish, poultry, pharmaceutical and seasonal operators.
Financial Health
StrongStrong · Growing, Hiring · 17% CAGR over 4y
Location
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Computed from 5 filingsInstalls, services and repairs commercial air conditioning and refrigeration systems, including cold rooms, cellar cooling, server room cooling and bar or restaurant refrigeration equipment, and…
Sells primarily to businesses needing commercial air conditioning and refrigeration, including offices, bars, restaurants, breweries and other premises requiring cellar cooling, cold rooms or server…
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
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Computed from 5 filingsProvides installation, servicing and maintenance of air conditioning and refrigeration systems for commercial and industrial clients. Also offers system support and facilities-related services to…
Serves businesses, facilities managers and property operators that use air conditioning or commercial refrigeration systems, including organisations needing ongoing maintenance and support for…
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 4y
Location
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Computed from 4 filingsDesigns, installs and maintains commercial air conditioning and ventilation systems. Provides HVAC design-and-build services, mechanical services, intelligent control systems and precision climate…
Serves businesses and organisations with commercial premises, particularly retailers, education providers, offices and commercial building operators across the UK.
Financial Health
StrongStrong · Growing · 0% CAGR over 3y
Location
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Computed from 5 filingsDesigns, installs, and maintains air conditioning systems for commercial and industrial buildings. Provides system design, on-site installation, servicing, and turnkey HVAC projects as a mechanical…
Serves businesses, contractors and property or facilities managers in the South East and South of England, across building projects of varying sizes.
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 4y
Location
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Computed from 3 filingsProvides HVAC engineering services including design, installation, maintenance and repair of air conditioning, refrigeration, plumbing, heating, ductwork and ventilation systems. Also delivers…
Serves commercial, industrial and domestic customers, including businesses, facilities or property managers, and homeowners with HVAC, plumbing, heating, ventilation and renewable energy requirements.
Financial Health
StrongStrong · Growing · 0% CAGR over 2y
Location
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Computed from 5 filingsSupplies, installs and services commercial air conditioning systems. Provides new system installation, routine maintenance, and breakdown repair for cooling equipment used in offices, retail premises…
Serves businesses and institutions across London and the South East, including offices, shops, schools, facilities managers, property accounts and organisations with IT environments needing climate…
Financial Health
HealthyHealthy · -67% CAGR over 4y
Location
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Computed from 2 filingsProvides installation, maintenance, repair and supply of commercial refrigeration and air conditioning systems, including cold room design and manufacture, equipment servicing, and temporary cool…
Sells primarily to businesses and public sector organisations needing commercial refrigeration and air conditioning, including leisure, retail and other commercial operators, across most of the UK.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 1y
Location
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Computed from 4 filingsDesigns, installs, and maintains air conditioning and cooling systems for commercial, industrial, and residential properties. Services include installation of chiller, split, rooftop, and ductless…
Serves a mix of B2B and B2C customers: commercial and industrial organisations with sites across the UK, plus residential customers with air conditioning needs.
Financial Health
HealthyHealthy · -9% CAGR over 3y
Location
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Computed from 4 filingsInstalls, services and repairs commercial and industrial air conditioning and refrigeration systems. Also provides refrigerated trailer hire for temporary cold storage and transport needs for…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 3y
Location
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Computed from 5 filingsDesigns, installs and maintains mechanical and electrical building services for commercial and industrial facilities, including HVAC, heating, ventilation, air conditioning, plumbing, electrical…
Serves commercial and industrial clients across the UK, including organisations in retail, healthcare, education, religious, process, leisure and residential sectors.
Financial Health
StrongStrong · Hiring · 9% CAGR over 4y
Location
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Computed from 3 filingsProvides mechanical and electrical installation, maintenance and repair services for commercial and industrial systems, including heating, chilled water, natural gas systems, pipework, chiller…
Serves commercial and industrial organisations, facilities managers and contractors needing mechanical, plumbing, heating, chilled water, gas and pipework support across Kent, London and the South…
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 2y
Location
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Computed from 5 filingsProvides design, installation, servicing and maintenance of commercial HVAC systems, including air conditioning, ventilation and air purification. Conducts system surveys, upgrades and compliance…
Serves UK businesses of all sizes, from small offices to large industrial facilities, with commercial premises requiring compliant indoor climate, air quality and ventilation support.
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
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Computed from 5 filingsProvides building services maintenance and repair for commercial and industrial facilities, including air conditioning, refrigeration, electrical, plumbing, ventilation and gas systems. Offers…
Serves commercial, industrial and retail organisations, public sector bodies such as NHS Scotland and the Ministry of Defence, and domestic customers across Scotland’s central belt.
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
Location
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Computed from 4 filingsProvides installation, maintenance and repair of air conditioning systems for commercial, industrial and institutional premises. Also supplies air conditioning units and offers heat pump and…
Serves commercial and industrial premises, schools and colleges, healthcare practices, IT facilities, retailers and community centres across Bedfordshire, Buckinghamshire and Hertfordshire.
Financial Health
StrongStrong · Growing · 0% CAGR over 3y
Location
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Computed from 5 filingsDesigns and installs HVAC systems for critical environments requiring precise temperature and humidity control. Provides chilled water systems, air conditioning, and mechanical ventilation, along…
Serves UK businesses operating critical environments, including data centres, laboratories, IT suites, offices, UPS and battery rooms, manufacturing facilities, and telecoms/IT modules requiring…
Financial Health
HealthyHealthy · Hiring · 68% CAGR over 5y
Location
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Computed from 5 filingsProvides mechanical and electrical engineering services, including installation and maintenance of heating, ventilation, air conditioning, chilled water, and ventilation systems. Also undertakes…
Serves UK businesses and organisations with commercial, retail and industrial sites, including facilities managers, contractors, large client teams and grid-scale energy storage project developers.
Financial Health
StableStable · -13% CAGR over 4y
Location
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Computed from 5 filingsDesigns, installs and maintains air conditioning, ventilation, refrigeration and heat pump systems for residential and commercial properties. Provides custom climate control systems, ventilation…
Serves homeowners and commercial clients across Scotland, including hotels, restaurants, retailers, gyms, sports venues and facilities managers.
Financial Health
HealthyHealthy
Location
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Computed from 3 filingsProvides design, installation, maintenance and repair of air conditioning, refrigeration and ventilation systems. Services include water‑cooled AC, commercial refrigeration, cold rooms, duct…
Serves commercial and residential clients in London, including restaurants, bars, hotels, pubs and clubs, office buildings, schools, universities, homeowners and apartment owners.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 2y
Location
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Computed from 5 filingsSupplies and installs commercial refrigeration equipment for retail and food service businesses, including display cabinets, blast chillers, freezers and cold rooms. Provides project management, shop…
Serves B2B customers in food retail and food service, including butchers, bakeries, cheese producers, proximity stores, commercial kitchens and businesses needing retail, storage or display…
Financial Health
WeakWeak · -10% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsProvides building services engineering and contracting, including design and installation of heating, ventilation, air conditioning, gas and plumbing systems. Delivers decarbonisation upgrades,…
Serves public sector, healthcare and education organisations, plus commercial, leisure and retail businesses across the UK with building estates requiring mechanical services projects.
Financial Health
StrongStrong · Growing, Hiring · 27% CAGR over 2y
Location
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How reCAPTCHA usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling. HVAC companies are identified using Firmbase's semantic classification of company activity, built from filings, websites and registered SIC codes rather than SIC codes alone. The detected counts and share figures on this page are computed within that sector cohort, so "share" always means share of HVAC companies with a detectable system — not of all UK companies.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
reCAPTCHA is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
UK HVAC by Security
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Frequently asked questions
How many UK HVAC companies use reCAPTCHA?
What share of UK HVAC companies run reCAPTCHA?
How is reCAPTCHA usage detected?
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