HVAC Companies in Cardiff: 324 Active Firms (2026)
HVAC companies design, install and maintain heating, ventilation, air conditioning and refrigeration systems for customers across Cardiff.
Facilities-management, estates and operations teams are the main buying centres, with finance usually entering once a maintenance contract or capital installation has been scoped. Cardiff demand looks mostly B2B and public-sector rather than consumer-led: commercial buildings, public sites and industrial premises need engineers who can work around occupied operations. Engagements tend to split between scheduled servicing, reactive call-outs, plant-room upgrades and project packages for ventilation, cooling or refrigeration. The operational test is less software-like scale and more engineer coverage, certification, parts access and dependable handover documentation.
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Cardiff has 324 actively trading HVAC companies in this list, a compact contractor base rather than a broad national supplier pool. Reported employment totals 726 people, reflecting a market where field delivery capacity matters as much as sales presence. Only 5 firms have turnover above £5M, so the revenue base appears concentrated in a small group of mid-market operators, while 97 companies have been incorporated since 2022. That younger layer points to regular new contractor formation, although many entrants are likely to remain small, site-led businesses.
Commercial HVAC work sits at the junction of construction, facilities management and energy-use compliance. Installers and maintainers are typically judged on safe site access, engineer availability, refrigerant handling, commissioning evidence and the ability to document planned preventative maintenance. Public-sector and industrial buyers tend to require repeatable service processes, insurance cover, health-and-safety evidence and auditable handover packs before granting access to plant rooms or occupied buildings. Procurement can therefore be slower than a domestic replacement job, but accepted contractors may benefit from recurring service and maintenance workflows.
Demand appears tied to the condition of existing commercial property, energy-cost scrutiny and the need to keep occupied premises usable during warmer periods. The Cardiff cohort has the feel of a local service market with a long tail of small contractors and a thinner layer of mid-market operators. That tends to favour firms with engineer retention, maintenance scheduling discipline and documented compliance processes, rather than pure installation volume. Consolidation may occur where owners lack succession options, but service quality and local response times are likely to remain important barriers to purely remote competitors.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
324
Active firms
2026
5
£5M+ firms
company revenue
97
Recent incorporations
since 2022
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Key facts
About 1% of the trading cohort reports turnover above £5M (5 of 324 firms) — the rest sits below that revenue band.
29% of the cohort was incorporated since 2022 (97 firms), so a sizeable share is in its first few filing cycles.
Cardiff HVAC and refrigeration contractors install, maintain and repair heating, ventilation, air-conditioning and refrigeration systems for commercial and domestic customers.
Buyer demand sits close to building compliance, energy use and everyday operational continuity.
Failed heating, cooling or ventilation usually requires a qualified contractor rather than a discretionary supplier.
The market appears fragmented, with local installation and maintenance contractors rather than very large national groups shaping the cohort.
Top Cardiff HVAC companies
Financial sub-scores
Computed from 3 filingsProvides installation, maintenance, repair and emergency call‑out services for air conditioning and refrigeration systems. Engineers install new units, service existing equipment, diagnose faults and…
Sells primarily to businesses needing air conditioning and refrigeration support, including food-industry organisations such as charities, retailers and manufacturers, as well as other commercial…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
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Computed from 4 filingsProvides design, installation, servicing and maintenance of commercial and domestic air conditioning systems. Also supplies and installs cellar cooling equipment and bespoke chiller and freezer cold…
Serves homeowners and commercial customers in the Cardiff area, including hospitality venues with beer or wine cellars and businesses needing chilled or freezer cold room capacity.
Financial Health
HealthyHealthy · Hiring · 44% CAGR over 3y
Location
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Financial sub-scores
Computed from 3 filingsProvides building services engineering, including design, installation and refurbishment of mechanical systems such as commercial heating, hot and cold water services, mechanical ventilation, air…
Serves public sector bodies, healthcare organisations and private commercial clients, including councils, hospitals, education campuses and organisations procuring through frameworks or…
Financial Health
HealthyHealthy · -6% CAGR over 2y
Location
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Computed from 4 filingsProvides commercial property maintenance and engineering services, including plumbing, gas heating, boilers, air conditioning and ventilation, electrical installation and testing, roofing works, and…
Serves businesses, commercial property owners and industrial companies across Wales, South West England and the M4 Corridor, spanning varied sectors needing facilities and property support.
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides design, installation and maintenance of heating, ventilation and air conditioning (HVAC) systems. Offers air conditioning, heating controls, ventilation systems, and repair and servicing for…
Serves businesses and organisations across the UK in commercial, industrial, healthcare, education, retail, hospitality, leisure, financial services and restaurants, plus high-end residential project…
Financial Health
StableStable · -5% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides commercial and industrial gas heating engineering services, including design and installation of radiant tube, warm air and cabinet heating systems, as well as HVAC applications,…
Serves commercial, industrial and small-business customers, including schools, colleges, care homes, nursing homes and doctors’ surgeries across South Wales and the West of England.
Financial Health
StableStable · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides installation, servicing and repair of heating, ventilation and air conditioning systems for residential and commercial properties. Also supplies and installs boilers, refrigeration…
Serves a mixed B2C and B2B market: homeowners and commercial organisations seeking heating, ventilation, air conditioning, plumbing, refrigeration or renewables services, including installation,…
Financial Health
StableStable · Hiring · 36% CAGR over 5y
Location
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Financial sub-scores
Computed from 4 filingsProvides mechanical, electrical and public health engineering services for building projects, including design and installation of heating, ventilation, water systems, lighting, power, fire alarms,…
Serves B2B and public-sector clients in commercial offices, healthcare, office fit-out, residential and education projects, including developers, contractors and building owners needing building…
Financial Health
StableStable · Hiring · 23% CAGR over 3y
Location
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Computed from 3 filingsProvides plumbing, heating and mechanical installation services for commercial construction projects, including rainwater systems, sanitaryware installation, above-ground drainage, leadwork, and…
Serves businesses and main contractors involved in commercial construction projects, including clients developing or refurbishing offices, public buildings and other non-domestic sites.
Financial Health
StableStable · -3% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Growing, Hiring · 3% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides design, installation and contracting services for building systems and interiors, including HVAC, electrical and plumbing installations, ceilings and walls, flooring, doors, EV charging…
Serves UK commercial and multi-site organisations, including retailers, builders’ merchants, veterinary practices, universities, shopping centres and contractors managing fit-out or facilities…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
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Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
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Computed from 3 filingsProvides building services commissioning for HVAC and water systems, including air and water balancing, domestic hot water commissioning, pre‑commission cleaning of heating and chilled water…
Serves construction contractors and building end users involved in HVAC and water-system projects, including organisations needing compliant commissioning documentation for building handover and…
Financial Health
WeakWeak · Hiring · 27% CAGR over 2y
Location
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Computed from 3 filingsFinancial Health
StrongStrong · Hiring · 29% CAGR over 2y
Location
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Computed from 5 filingsFinancial Health
StableStable · -68% CAGR over 4y
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Financial Health
N/AN/A
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Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
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Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
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Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
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Computed from 4 filingsFinancial Health
DistressedDistressed · 0% CAGR over 3y
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Computed from 3 filingsFinancial Health
StableStable · 0% CAGR over 2y
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Computed from 5 filingsFinancial Health
StableStable · -13% CAGR over 4y
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Computed from 2 filingsFinancial Health
StrongStrong · Hiring · 81% CAGR over 1y
Location
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Computed from 5 filingsFinancial Health
StableStable
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Computed from 3 filingsFinancial Health
DistressedDistressed
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Computed from 3 filingsFinancial Health
StrongStrong · Growing, Hiring · 41% CAGR over 2y
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Computed from 5 filingsFinancial Health
StableStable
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Computed from 3 filingsFinancial Health
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Computed from 5 filingsFinancial Health
StableStable
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Financial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong
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Computed from 5 filingsFinancial Health
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Computed from 5 filingsFinancial Health
WeakWeak · -68% CAGR over 4y
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Computed from 5 filingsSupplies, installs, maintains and repairs commercial refrigeration units and air conditioning systems for businesses. Provides servicing and engineering support for cooling equipment, including…
Serves businesses needing commercial refrigeration and air conditioning across South Wales and nearby areas including Bristol, Bath, Gloucester, Taunton, Swindon, Cheltenham and Hereford.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides mechanical building services including design, installation and maintenance of heating, ventilation, plumbing and air conditioning systems. Also undertakes commercial gas engineering,…
Serves B2B commercial clients, including property owners, developers, main contractors and facilities managers responsible for building services projects and mechanical systems maintenance.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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Computed from 5 filingsDesigns and installs air conditioning and ventilation systems, including fresh air supply, extract and ductwork systems. Provides CAD-based system design, commissioning, and maintenance services,…
Serves end users, project managers and contractors needing air conditioning, ventilation and ductwork projects, primarily across South Wales and beyond.
Financial Health
HealthyHealthy · -5% CAGR over 5y
Location
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Computed from 5 filingsProvides installation, maintenance and repair of air conditioning, refrigeration and HVAC systems for commercial and domestic clients. Also supplies equipment, offers maintenance contracts and…
Serves domestic and commercial customers in South Wales with air conditioning, refrigeration and HVAC needs, including maintenance contract customers and small or large project buyers.
Financial Health
WeakWeak · -2% CAGR over 4y
Location
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Computed from 5 filingsSupplies, installs and services commercial air conditioning and refrigeration systems. Provides kitchen equipment maintenance and refrigerated trailer hire, supporting businesses with installation,…
Serves businesses in Wales and the West of England, particularly commercial sites requiring air conditioning, refrigeration or kitchen maintenance support.
Financial Health
WeakWeak · -4% CAGR over 4y
Location
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Computed from 3 filingsProvides design, installation and maintenance of electrical and mechanical building services, including HVAC, gas, heating, ventilation, lighting, power distribution, and fire and security systems…
Serves commercial property developers, education and healthcare organisations, housing associations, PRS/student accommodation developers, and industrial clients including data centres, manufacturers…
Financial Health
StrongStrong · Growing, Hiring · 62% CAGR over 2y
Location
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Computed from 3 filingsProvides mechanical and electrical engineering services for commercial facilities, including air conditioning, heating, plumbing, ventilation and steel fabrication, alongside electrical distribution,…
Serves businesses and public-sector organisations across South Wales and beyond, including industrial sites, large employers and estates/facilities teams needing mechanical, electrical and compliance…
Financial Health
StableStable · -2% CAGR over 2y
Location
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Computed from 5 filingsSupplies, installs and maintains air conditioning and refrigeration systems for commercial and domestic premises. Services include cold room design and installation, cellar cooling, ventilation…
Serves businesses and homeowners across South Wales, including retailers, fitness centres, commercial and industrial sites, and hospitality premises needing climate control, cold storage or cellar…
Financial Health
HealthyHealthy · Hiring · 34% CAGR over 4y
Location
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Computed from 4 filingsProvides plumbing, heating and mechanical building services for commercial construction projects, including system design, planning, installation and maintenance. Also delivers ventilation systems,…
Serves B2B clients in commercial construction, including main contractors, healthcare trusts, project managers and facilities teams, plus some domestic maintenance customers across South Wales and…
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 3y
Location
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Computed from 5 filingsProvides mechanical and electrical contracting services for construction projects, including installation of heating, plumbing, ventilation, air conditioning, power and lighting, fire alarms, CCTV,…
Serves B2B and public-sector clients in construction, commercial property, social housing, education, energy, healthcare, residential development and retail.
Financial Health
StrongStrong · Growing, Hiring · 18% CAGR over 3y
Location
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Computed from 5 filingsProvides installation, servicing and repair of heating, ventilation and air conditioning systems. Also offers boiler servicing, plumbing repairs, water hygiene services, gas testing and purging, TMV…
Serves homeowners and landlords in South Wales, plus commercial and industrial clients across the UK, including blue-chip property operators along the M4 corridor.
Financial Health
HealthyHealthy · -16% CAGR over 4y
Location
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Computed from 5 filingsDesigns, installs and commissions HVAC mechanical systems for commercial, retail and leisure buildings. Provides system design, climatic control installation, planned maintenance, emergency callouts,…
Serves commercial, retail and leisure organisations across the UK, including fit-out contractors, developers, councils and facilities or property teams managing single-unit, new-build and…
Financial Health
StableStable · -65% CAGR over 4y
Location
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Computed from 5 filingsProvides mechanical building services including design, installation and commissioning of plumbing and public health systems, LTHW and chilled water pipework, ventilation and air conditioning, plant…
Serves commercial and domestic customers needing mechanical building services, including property owners, developers and contractors requiring heating, ventilation, air conditioning, gas, water and…
Financial Health
StableStable · Hiring · 14% CAGR over 4y
Location
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Computed from 4 filingsProvides installation, design, and servicing of heating and energy systems, including commercial and domestic heating, solar photovoltaic and solar thermal systems, heat pumps, and insulation.…
Serves housing associations, local councils, Welsh Government bodies, universities and social housing organisations across Wales, mainly public-sector and B2B clients managing housing and estate…
Financial Health
StableStable · 0% CAGR over 3y
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How Cardiff HVAC companies work and how to sell to them
What they do
Cardiff HVAC contractors earn revenue through a mix of planned maintenance agreements, reactive call-outs and installation or upgrade projects. Recurring service work is usually priced as a retainer or scheduled maintenance contract, with extra labour, parts and emergency attendance charged separately. Larger ventilation, cooling, refrigeration or controls projects tend to be scoped as fixed-price works, sometimes with staged payments tied to survey, installation, commissioning and handover. Margins depend on engineer utilisation, parts availability, travel time between local sites and the ability to keep assets running without disrupting occupied buildings.
Who they sell to
Buyers are usually facilities managers, estates teams, operations directors and procurement staff at commercial, public-sector and industrial sites. Finance becomes involved when a maintenance agreement commits annual spend or when plant-room work becomes capital expenditure. Smaller jobs may come through direct referral, existing service relationships or approved-contractor lists; larger packages are more likely to involve written scopes, site visits, health-and-safety checks and competitive quotes. Typical sales cycles are short for urgent breakdowns, slower for planned replacement programmes, and slower again where public procurement rules or landlord approvals shape the timetable.
What they buy
Most HVAC firms tend to spend on field-service scheduling, job management, quoting, invoicing, accounting, fleet administration, health-and-safety documentation and customer communication tools. Firms with maintenance books also need asset registers, service reminders, document storage and reporting that can produce usable handover packs for estates teams. Recruitment, training, insurance, legal support, bookkeeping, marketing and website maintenance are common services around the core operation. Physical purchasing centres on vans, tools, safety equipment, controls, parts, refrigerants and access equipment, with supplier reliability often mattering as much as headline unit price.
Why and how to sell to them
HVAC buyers tend to evaluate vendors when engineer workload outgrows spreadsheets, response times slip, compliance paperwork becomes harder to evidence, or a new maintenance contract requires more formal reporting. Other triggers include a move from domestic work into commercial sites, a new operations manager, fleet growth, acquisition of another contractor, or pressure from customers to document service history more clearly. Outbound messages usually land better when they refer to downtime, first-time fix rates, engineer scheduling, proof of attendance and faster handover documentation, rather than abstract productivity claims.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. 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.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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Frequently asked questions
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