HVAC Companies Using Google Tag Manager in the UK: 637 Active Firms (2026)
HVAC companies in the UK install, service and maintain heating, ventilation, air-conditioning and refrigeration systems while running tag-management software.
For HVAC contractors, a tag-management layer is mainly a measurement and control tool: it lets marketing teams, outsourced web agencies and operations staff place analytics events, enquiry tracking and campaign tags without treating every change as a website rebuild. Adoption usually signals a direct-channel posture, with quote forms, maintenance-plan enquiries, emergency call-outs and campaign landing pages all needing attribution. The buying centre tends to sit between marketing, finance-led revenue reporting and regional service management. In this sector, the tool is less about software engineering maturity and more about proving which routes to market generate commercial, industrial, public-sector and facilities-management leads.
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637 companies running this tag-management stack are actively trading in the UK HVAC cohort. Reported headcount totals 2,272 across 117 firms, with 117 of 117 reporting at least one employee. Within detected tag managers for the sector, this stack accounts for 99.5% of a 640-detection category view, compared with 0.6% for the other named tag-management system. Registered offices skew towards the South East at 18.8%, followed by the North West at 12.9%, the East of England at 12.6%, London at 11.1% and the South West at 10.2%.
HVAC contractors using website tags sit at the junction of trade-services procurement and marketing measurement. Public-sector and facilities-management buyers often expect auditability around service requests, maintenance enquiries and campaign source reporting, while privacy and cookie-consent rules affect how analytics, advertising and form-tracking scripts are deployed. The practical risk is usually less about the tag-management tool itself than about unmanaged external scripts, duplicated consent states, or attribution tags added by agencies. For multi-region contractors, governance tends to become a marketing-operations issue once several branches, franchise-style operations or service lines share the same website estate.
Adoption appears likely to remain tied to how HVAC contractors win and evidence work, rather than to the technology market in isolation. Firms with planned-maintenance contracts, energy-efficiency propositions and multi-site customer bases tend to need better attribution for enquiries that move from search to form fill to phone call. Smaller local installers may keep simpler websites until agency support or paid media spend justifies tag governance. Over time, bundling inside website platforms and consent tools may reduce visible configuration work, but it is unlikely to remove the need for disciplined ownership of tags, analytics events and lead-source reporting.
Adoption by company size
Adoption of Google Tag Manager rises with company size across the trading UK HVAC companies in this cohort. 1.7% of the 23,256 companies with under 10 employees run Google Tag Manager (405 detected). 17.1% of the 1,144 companies with 10–50 employees run Google Tag Manager (196 detected). 31.3% of the 83 companies with over 50 employees run Google Tag Manager (26 detected). That is a 29.6% gap between the over 50 employees and under 10 employees bands.
637
Active firms
2026
99.5%
Of detected Tag managers share
UK HVAC
7
Median headcount
Filed accounts
1,295
Verified contacts
Across this cohort
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Key facts
About 6% of the trading cohort reports turnover above £5M (41 of 637 firms) — the rest sits below that revenue band.
6% of the cohort was incorporated since 2022 (43 firms), so a sizeable share is in its first few filing cycles.
Within detectable HVAC tag-management installations, the profiled system accounts for 99.5% (637) of the 640-company category denominator; another system appears on 0.6% (4).
The regional split is led by the South East at 18.8% (120), followed by the North West at 12.9% (82), the East of England at 12.6% (80), London at 11.1% (71) and the South West at 10.2% (65).
Content-management software appears alongside the tag manager at 73.2% (466), while analytics tooling appears on 48.4% (308).
Bot-checking software is detected on 47.6% (303), and SEO tooling on 46.8% (298), suggesting many sites support enquiry forms and local search acquisition.
The cohort overlaps with Construction at 27.6% (176) and Renewable Energy at 18.5% (118), reflecting HVAC’s boundary with building-services and energy work.
Tag manager market share among UK HVAC
What else do Google Tag Manager-running HVAC run?
Share of the 637 Google Tag Manager-running UK companies where each technology was also detected. As of June 2026.
Where Google Tag Manager 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
£686.2K
Median UK turnover
6.4%
Above £5M turnover
43
Incorporated since 2022
1,295 verified decision-maker contacts
across these 637 companies, with emails available in Firmbase. Filter by role, seniority and stack.
Top UK HVAC using Google Tag Manager
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 filingsProvides installation, servicing, maintenance and repair of commercial HVAC systems, including air conditioning, refrigeration and heat pumps. Offers planned maintenance programmes, emergency…
Serves businesses and public-sector organisations in pharmaceutical, hospitality, petrochemical, engineering, education, retail and leisure sectors across the UK.
Financial Health
StrongStrong · Growing, Hiring · 24% CAGR over 4y
Location
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Computed from 5 filingsDesigns, installs and maintains commercial refrigeration and cooling systems, including CO2 and hydrocarbon refrigeration, cold rooms, air conditioning, blast chillers, and food processing chillers,…
Serves homeowners and B2B/public-sector organisations, including hospitality, food production, offices, supermarkets, retail and leisure, transport hubs, data centres, cleanrooms, pharmacies,…
Financial Health
HealthyHealthy · -13% CAGR over 5y
Location
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Financial sub-scores
Computed from 5 filingsProvides installation, maintenance and repair of commercial air conditioning, HVAC, ventilation and refrigeration systems, including VRF/VRV and cold rooms. Also hires portable air conditioners,…
Serves UK businesses needing climate control, especially hospitality, food manufacturing, pharmaceutical, data centre/server room and event operators, plus organisations with commercial premises…
Financial Health
StableStable · -68% CAGR over 4y
Location
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Computed from 5 filingsProvides commercial air conditioning, refrigeration, and ventilation services, including system installation, maintenance, repair, efficiency controls, and testing and compliance inspections for…
Serves B2B customers across Yorkshire and the UK, including hospitality venues, pubs and other commercial premises with refrigeration, air conditioning, ventilation and compliance needs.
Financial Health
HealthyHealthy · Hiring · 10% CAGR over 5y
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 5 filingsProvides installation, repair and maintenance of air conditioning, commercial refrigeration and ventilation systems. Services commercial catering equipment, kitchen extraction, boilers, dishwashers,…
Serves business and public sector customers needing facilities engineering, including commercial kitchens, hospitality venues, organisations with catering operations, and sites requiring air…
Financial Health
StrongStrong · Growing, Hiring · 16% CAGR over 4y
Location
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Computed from 5 filingsProvides HVAC contracting services including air handling unit (AHU) installation, refurbishment and maintenance, ventilation upgrades, electrical installation, and building management control…
Serves building operators, facilities leaders and estates teams at critical UK estates, including Tier 1 FM firms, NHS Trusts, public sector estates, car manufacturers and ventilation equipment OEMs.
Financial Health
StrongStrong · Hiring · 26% CAGR over 4y
Location
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Computed from 3 filingsProvides mechanical and electrical building services for commercial and industrial sectors, including design, installation and maintenance of air conditioning, heating, ventilation, refrigeration,…
Serves commercial, industrial and public sector organisations nationwide, including defence, hospitality, retail, healthcare, government and education clients needing building services support.
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 2y
Location
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Computed from 5 filingsDesigns, installs and maintains air conditioning, ventilation and HVAC systems for commercial and industrial premises. Provides system servicing, repair, and mechanical building services including…
Serves commercial and industrial businesses across the UK, including manufacturing, healthcare, hospitality and retail organisations, typically facilities or operations teams responsible for…
Financial Health
StableStable · Hiring · 3% CAGR over 4y
Location
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Computed from 5 filingsProvides heating, ventilation and air conditioning (HVAC) services including system installation, servicing and contract maintenance. Supplies HVAC parts, conducts TM44 air‑conditioning inspections,…
Serves businesses and property owners across the UK needing HVAC support, including commercial facilities teams, industrial sites and residential project clients seeking installation, maintenance,…
Financial Health
HealthyHealthy · -41% CAGR over 4y
Location
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Computed from 5 filingsProvides design, installation, maintenance and repair of climate control systems including air conditioning, refrigeration, water chillers, air handling units, ventilation systems and data centre…
Sells to businesses and organisations needing climate control systems, including operators of data centres and facilities requiring air conditioning, refrigeration, ventilation and chillers. Serves…
Financial Health
StrongStrong · Growing, Hiring · 80% CAGR over 5y
Location
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Computed from 2 filingsDesigns, installs and maintains commercial and industrial HVAC systems, including evaporative cooling, air conditioning, heating, ventilation and solar‑integrated solutions. Provides system…
Serves UK commercial and industrial businesses, including distribution centres, food and beverage sites, hotels, leisure facilities, manufacturers, pharmaceutical plants, plastic moulding firms,…
Financial Health
StrongStrong · Growing, Hiring · 50% CAGR over 1y
Location
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Computed from 5 filingsInstalls, services and maintains commercial refrigeration and air conditioning systems. Provides design and installation of cooling equipment including cold rooms and remote refrigeration, plus…
Serves commercial and public-sector organisations across the West Midlands and UK, including healthcare providers, manufacturers, automotive sites, retailers and other businesses with critical…
Financial Health
HealthyHealthy · -5% CAGR over 4y
Location
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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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Computed from 5 filingsProvides installation, servicing, repair and maintenance of commercial and residential air conditioning, refrigeration, heating and heat pump systems. Also offers electrical, ventilation, drainage…
Serves businesses and domestic customers across the South East, including hotels, office blocks, supermarkets, commercial kitchens, care homes, leisure centres, schools, universities, and homeowners…
Financial Health
StrongStrong · Growing, Hiring · 18% CAGR over 5y
Location
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Computed from 3 filingsProvides heating, ventilation, air conditioning and refrigeration services for commercial, industrial and residential facilities, including system design and installation, preventative maintenance,…
Serves facilities managers, businesses and property owners across domestic, commercial and industrial sites, including manufacturing/process sites, education, leisure, healthcare and residential…
Financial Health
StrongStrong · Growing, Hiring · 44% CAGR over 2y
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 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, maintenance, repair and emergency servicing of commercial air conditioning and refrigeration systems. Also offers system diagnostics, cleaning and planned maintenance packages…
Serves businesses in London and the M25 needing HVAC support, including education providers, healthcare facilities, gyms, hotels, men’s clubs, offices and organisations operating server rooms or…
Financial Health
HealthyHealthy · -5% CAGR over 4y
Location
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Computed from 5 filingsProvides industrial and commercial refrigeration and air conditioning services, including system design, installation, maintenance and repair. Also operates cold storage and blast freezing facilities…
Serves industrial and commercial customers, including shops, factories, production sites, offices, schools, restaurants, server rooms, hospitals, and businesses needing palletised cold storage across…
Financial Health
StrongStrong · Growing · 2% 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 facilities management and building services including HVAC installation and maintenance, air conditioning, heating and plumbing, electrical inspection and testing, ventilation systems, and…
Serves businesses, public-sector organisations and homeowners, including education, healthcare, industrial, commercial office, leisure, heritage and high-end residential customers across London, the…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
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Computed from 5 filingsDesigns, installs and services air conditioning, ventilation and building control systems. Provides VRV/VRF commissioning, health checks and optimisation, centralised control systems, planned…
Serves commercial property owners, facilities managers and organisations operating sites with air conditioning, ventilation and building control systems.
Financial Health
HealthyHealthy · Growing, Hiring · 6% CAGR over 4y
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Computed from 4 filingsProvides installation, servicing and repair of commercial air conditioning and mechanical ventilation systems. Also delivers electrical services including safety testing, LED lighting upgrades and EV…
Serves UK businesses and public-sector organisations, including offices, schools, hospitals, universities, government buildings, retailers, manufacturers, healthcare providers, gyms and leisure…
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 3y
Location
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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 5 filingsDesigns, installs and maintains commercial cooling and refrigeration systems, including cold rooms, freezer rooms, air conditioning units, cellar cooling equipment and ice machines. Provides…
Serves businesses across England, including commercial premises, food and beverage operators, pubs and breweries, and organisations requiring temperature-controlled storage, cellar cooling,…
Financial Health
StableStable · -5% CAGR over 4y
Location
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Computed from 5 filingsProvides design, installation and commissioning of evaporative cooling and HVAC systems, including heating, ventilation, air conditioning, plumbing and electrical building services, with maintenance…
Serves B2B commercial and industrial organisations, including automotive sites, distribution centres, food and beverage facilities, hotels, offices, education estates, retail/leisure venues, student…
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 4y
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 4 filingsProvides installation, maintenance and repair of air conditioning and refrigeration systems. Supplies and installs air source heat pumps, conducts energy efficiency reports, and offers engineering…
Serves building owners and facilities managers in London and the Home Counties, including public sector buildings, offices, food manufacturing sites and premises housing sensitive technology.
Financial Health
StableStable · -4% CAGR over 3y
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Computed from 3 filingsProvides installation, maintenance, repair and emergency callout services for commercial, industrial and marine refrigeration, food processing machinery and air conditioning. Also supplies and sells…
Serves commercial, industrial and marine businesses across Devon, Cornwall and the South West, including shops, suppliers, restaurants, cafés, butcheries, bakeries, food and fish factories, and…
Financial Health
StableStable · -4% CAGR over 2y
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Computed from 5 filingsDesigns, installs and maintains mechanical and electrical building services, including air‑conditioning, ventilation and heating systems. Provides commercial pipework installation, planned…
Serves large commercial estate owners and facilities teams, including education institutions, healthcare sites, offices and law firms needing mechanical and electrical building services support.
Financial Health
StrongStrong · Growing, Hiring · 21% CAGR over 4y
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Computed from 5 filingsProvides installation, servicing, maintenance and repair of air conditioning and commercial refrigeration systems, including cold rooms, chillers and cabinet fridges, for commercial and retail…
Serves commercial, retail and leisure businesses needing refrigeration and air conditioning, including produce-led operations, plus homeowners seeking domestic air conditioning, mainly across the…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
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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
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Computed from 5 filingsProvides rental of industrial cooling and heating equipment including chillers, boilers, air conditioning units, heaters and air handling systems. Offers delivery, installation and support for…
Serves B2B and public sector customers, including healthcare, education, data centres, construction, manufacturing, food and beverage, cold chain operators, and facilities, HVAC, M&E and…
Financial Health
StrongStrong · Growing, Hiring · 58% CAGR over 4y
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Computed from 5 filingsDesigns, installs and maintains refrigeration and air conditioning systems for domestic and commercial clients. Provides cold rooms, commercial fridge and freezer systems, ice machines, and offers…
Serves B2C homeowners and B2B commercial premises that rely on temperature-controlled environments, including businesses with cold rooms, commercial fridges/freezers and specialist environmental…
Financial Health
StrongStrong · Growing, Hiring · 9% CAGR over 4y
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Computed from 3 filingsDesigns and manufactures precision air conditioning units, air handling units and chillers for data centres, telecom infrastructure and other technical environments. Also provides cooling system…
Serves businesses and infrastructure operators with mission-critical facilities, including data centre owners, enterprise IT teams, colocation/cloud providers, telecom networks, control rooms and…
Financial Health
HealthyHealthy · Profitable · 2% CAGR over 2y
Location
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Computed from 3 filingsProvides servicing, maintenance and repair of air conditioning and HVAC systems for commercial clients. Carries out fault finding, commissioning, system health checks and reports for equipment…
Serves businesses across Scotland with commercial air conditioning, refrigeration and heat pump systems, including direct clients and other service providers managing maintenance for their own…
Financial Health
StrongStrong · Growing, Hiring · 50% CAGR over 2y
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Computed from 5 filingsProvides sales, maintenance, repair and hire of industrial water chillers and cooling systems. Offers emergency breakdown support, planned preventative maintenance, system diagnostics and supply of…
Serves B2B industrial and manufacturing organisations across the UK, including automotive suppliers, plastics and packaging firms, breweries, pharmaceuticals, laboratories, machine tooling,…
Financial Health
StrongStrong · Hiring · 32% CAGR over 4y
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Computed from 5 filingsProvides installation, maintenance and repair of commercial refrigeration and air conditioning systems, including cold rooms and retail refrigeration units. Offers emergency breakdown services,…
Serves commercial and industrial organisations across East Anglia and the South East, including restaurants, retailers, distributors and manufacturers with fridges, cold rooms and air conditioning…
Financial Health
StrongStrong · Growing, Hiring · 3% CAGR over 4y
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Computed from 3 filingsProvides design, installation, servicing and maintenance of plant room systems for commercial and industrial buildings, including gas, mechanical, electrical, HVAC and pipework systems, with…
Sells to businesses and organisations needing plant room, HVAC and M&E support, including facilities management teams, commercial and industrial building operators, schools, and social or sheltered…
Financial Health
StrongStrong · Growing, Hiring · 61% CAGR over 2y
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Computed from 3 filingsDesigns and installs bespoke control systems for heating, ventilation and air conditioning (HVAC) in commercial buildings. Provides system commissioning, servicing, maintenance and emergency repairs,…
Serves businesses and organisations responsible for commercial buildings, including building owners, property managers and facilities teams managing HVAC and intelligent control systems.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
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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
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Computed from 5 filingsProvides energy efficiency services for commercial buildings, focusing on heating, ventilation and air conditioning systems. Conducts energy surveys, refurbishes and maintains ventilation plant, and…
Serves commercial and public-sector organisations, from SMEs to national organisations and government agencies, with facilities seeking lower energy use from HVAC, ventilation, heating and lighting…
Financial Health
StrongStrong · Growing, Hiring · 35% CAGR over 4y
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Computed from 5 filingsProvides HVAC services focused on air-handling units, including refurbishment, manufacturing, installation, coil repair and replacement, and control upgrades. Conducts ventilation surveys,…
Serves B2B customers managing commercial and industrial buildings, including facilities teams, mechanical contractors and property operators needing air-handling, ventilation, boiler and pipework…
Financial Health
HealthyHealthy
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Computed from 3 filingsDesigns and installs commercial air conditioning, ventilation and mechanical building services systems. Provides mechanical and electrical turnkey projects, energy‑efficient HVAC solutions, system…
Serves B2B clients including building companies, architects, consultants and commercial end users, with projects for offices, business parks, heritage buildings, rail-related sites and multi-site…
Financial Health
StrongStrong · -2% CAGR over 2y
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Computed from 4 filingsProvides design, supply, installation and maintenance of heating, ventilation, air conditioning and plumbing systems for commercial and industrial buildings, including gas, LPG and oil pipework,…
Serves B2B and public-sector customers managing commercial or industrial buildings, including small industrial units, offices, mills, schools, churches, retail park units and aircraft hangars.
Financial Health
StrongStrong · Growing · 1% CAGR over 3y
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Computed from 5 filingsProvides mechanical, electrical and plumbing (MEP) building services for commercial and public sector facilities, including installation, maintenance and repair of heating systems, electrical…
Serves businesses and large public sector organisations across the UK, including commercial property, education, healthcare, industrial and manufacturing, and renewable energy clients, typically…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
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Computed from 5 filingsDesigns, supplies, installs and maintains commercial kitchen extraction, ventilation and HVAC systems. Provides extractor fan installation and repair, air conditioning systems, ductwork cleaning, and…
Sells to businesses operating commercial kitchens, including restaurant chains, takeaways, supermarkets and food venues needing kitchen extraction, ventilation and HVAC services, particularly across…
Financial Health
HealthyHealthy · 0% CAGR over 4y
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Financial sub-scores
Computed from 5 filingsDesigns, supplies and installs commercial kitchens and catering facilities. Provides commercial refrigeration, ovens, dishwashers and ventilation systems, plus maintenance, repair and planned…
Sells to businesses and institutions running commercial kitchens, including restaurants, hotels, hospitals, care homes and schools across the UK. Targets operators and facilities teams needing…
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 6y
Location
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Showing 50 of 637 — +587 more with verified decision-maker contacts, live data, and CRM sync.
Unlock all 637 leads
Showing 50 of 637 — +587 more with verified decision-maker contacts, live data, and CRM sync.
How Google Tag Manager 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.
Google Tag Manager is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
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Frequently asked questions
How many UK HVAC companies use Google Tag Manager?
What share of UK HVAC companies run Google Tag Manager?
How is Google Tag Manager usage detected?
What size HVAC companies use Google Tag Manager in the UK?
What do Google Tag Manager-running HVAC companies also run?
Can I get contact details for these companies?
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