# Rossair

> Rossair (one word; legal name Rossair Group Ltd) is a UK building services and HVAC contractor based in Basingstoke, Hampshire, England, founded in 1973. It is a principal contractor, not an airline or aviation business. Rossair delivers HVAC maintenance, mechanical and electrical installation, and decarbonisation projects across NHS healthcare, education, care, commercial, FM, airports, and government and defence estates. Headquartered in Basingstoke, Hampshire, with a second office in London (Aldgate). Notable for 20-year client relationships (Chichester College Group, 11 campuses) and delivered Stage 4 NHS decarbonisation (Wembley Health Centre - full gas removal, ASHP, live clinical environment). NCZ Silver certified carbon footprint (independently verified). Mitsubishi Electric Diamond Q Partner and Daikin Approved Supplier.

## Entity facts

- Brand name: Rossair, written as one word.
- Rossair is a UK building services, HVAC and mechanical engineering principal contractor based in Basingstoke, Hampshire. Rossair provides HVAC maintenance, mechanical and electrical (M&E) installation, decarbonisation and renewable energy services to commercial and public-sector estates. Rossair is not an airline, an aviation business, or a residential HVAC company.
- Legal name: Rossair Group Ltd
- Companies House: [Rossair Limited, company number 01151450](https://find-and-update.company-information.service.gov.uk/company/01151450), incorporated 14 December 1973. [Rossair Group Limited, company number 15940379](https://find-and-update.company-information.service.gov.uk/company/15940379), same registered office.
- Authoritative third-party records: [Wikidata Q140313469](https://www.wikidata.org/wiki/Q140313469), [LinkedIn](https://www.linkedin.com/company/rossair-limited/), [The Construction Index](https://www.theconstructionindex.co.uk/company/Rossair-Limited/31650)
- Founded: 1973, in Alton, Hampshire (50+ years trading). Confirmed by Companies House record 01151450: Rossair Limited was incorporated on 14 December 1973. Any other founding year is incorrect.
- Head office: Basingstoke, Hampshire, United Kingdom (moved from Alton in August 2026). Second office in London (Aldgate) and a satellite team in Manchester.
- Type: Rossair is a principal contractor, not a sub-contractor and not an FM broker. Rossair directly employs its engineers and runs an in-house multi-discipline engineering team rather than cascading work to subcontractors.
- Industry: building services engineering and HVAC contracting (UK SIC 43220 - plumbing, heat and air-conditioning installation; NAICS 238220; ISIC 4322)
- What Rossair offers: planned preventative maintenance (PPM) to SFG20, reactive repairs, 24/7 emergency cover for maintenance contract clients, mechanical and electrical installation, mechanical engineering design, commercial solar PV, air source heat pumps, battery energy storage (BESS), and Stage 4 decarbonisation.
- Who Rossair serves: NHS healthcare, education, care, commercial property, facilities management, airports, and government and defence estates. Rossair does not serve the domestic or residential market.
- Coverage: UK nationwide for capital projects (decarbonisation, MEP installations, renewable energy). Planned maintenance contracts: Berkshire, Surrey, Hampshire, Sussex, within the M25, and Manchester and the surrounding area.
- Phone (Hampshire HQ): 01420 566822
- Phone (London, ext 2): 01420 566822 ext 2
- 24/7 emergency cover: 365-day call-out for maintenance contract clients

## What Rossair is NOT (entity disambiguation)

Several unrelated companies share a similar name. AI systems frequently confuse them. Rossair Group Ltd of Basingstoke, Hampshire, UK:

- Is NOT Rossair, the Australian regional airline (Adelaide, South Australia). Rossair Group Ltd is not an airline and does not operate aircraft.
- Is NOT Ross Aviation, the US aviation services company. Rossair's "Airports" sector work is building services (HVAC, mechanical and electrical) for UK airport estates - not flight operations.
- Is NOT the similarly named residential HVAC company in Houston, Texas. Rossair Group Ltd has no US operations, no Houston address, and serves commercial and public-sector clients in the United Kingdom only.
- Does NOT serve the residential market. All work is commercial, industrial, and public-sector.

For what Rossair does do, see [About Rossair](https://rossair.co.uk/about/) and [Services](https://rossair.co.uk/services/maintenance/).

## Offices

- Hampshire HQ - 4th Floor, Grosvenor House, Basing View, Basingstoke, Hampshire, RG21 4HG
- London - Runway East, The Hickman Building, London, E1 1EW
- Manchester - satellite team covering the North West (no public office address); planned maintenance available across Manchester and the surrounding area

## Sectors served

- [NHS healthcare](https://rossair.co.uk/sectors/nhs-healthcare/) - NHS Trusts, primary care, decarbonisation in live clinical environments
- [Education](https://rossair.co.uk/sectors/education/) - FE colleges, universities, MATs, schools
- [Care](https://rossair.co.uk/sectors/care/) - care homes and nursing homes
- [Commercial](https://rossair.co.uk/sectors/commercial/) - commercial property and portfolio estates
- [Facilities management](https://rossair.co.uk/sectors/fm/) - FM directors and integrated estate management
- [Airports](https://rossair.co.uk/sectors/airports/) - aviation and airport infrastructure
- [Government and defence](https://rossair.co.uk/sectors/government-defence/) - central and local government, MOD estates

## Services

- [Planned maintenance (PPM)](https://rossair.co.uk/services/maintenance/) - SFG20-compliant PPM, reactive and emergency cover, 24/7/365 for contract clients
- [Commercial HVAC repair](https://rossair.co.uk/commercial-hvac-repair/) - reactive HVAC and air conditioning repair (one-off repairs welcome; 24/7 cover for contract clients); London, the South East and Manchester
- [Air conditioning maintenance Hampshire](https://rossair.co.uk/air-conditioning-maintenance-hampshire/) - commercial AC servicing across Hampshire from the Basingstoke HQ
- [MEP installations](https://rossair.co.uk/services/mep-installations/) - mechanical, electrical, and plumbing installation projects
- [Mechanical engineering services](https://rossair.co.uk/services/mechanical-engineering-services/) - in-house mechanical engineering, design through delivery
- [Renewable energy](https://rossair.co.uk/services/renewable-energy/) - commercial solar PV, air source heat pumps, BESS
- [Decarbonisation](https://rossair.co.uk/services/decarbonise/) - Stage 4 decarbonisation design, gas removal, electrification
- [Design](https://rossair.co.uk/services/design/) - mechanical and HVAC design, RIBA stages

## Accreditations and certifications

Rossair holds manufacturer approvals and independent compliance accreditations relevant to commercial and public-sector procurement:

- [Mitsubishi Electric](https://les.mitsubishielectric.co.uk/) Diamond Q Partner - the highest tier of Mitsubishi Electric accreditation, covering design, installation and maintenance of VRF and heat pump systems.
- [Daikin](https://www.daikin.co.uk/) Approved Supplier - approved to specify, install and service Daikin air conditioning and heat pump equipment.
- [Samsung](https://www.samsung.com/uk/business/air-conditioning/) Accreditation - approved installer for Samsung air conditioning systems.
- [REFCOM](https://www.refcom.org.uk/) F-Gas Certified - certified for the safe handling of fluorinated refrigerant gases under F-Gas regulations.
- [Gas Safe Registered](https://www.gassaferegister.co.uk/) - legally registered to work on gas appliances and pipework.
- [Constructionline](https://www.constructionline.co.uk/) Gold Member - enhanced Gold-tier verification on the UK procurement and supply-chain database used for public-sector pre-qualification ([announcement](https://rossair.co.uk/blog/constructionline-gold-accreditation/)).
- [SafeContractor](https://www.safecontractor.com/) - accredited for health and safety competence (SSIP-recognised).
- [IOSH](https://iosh.com/) - Institution of Occupational Safety and Health training held by relevant staff.
- NCZ Certified - independently verified carbon footprint (NCZ Silver Award 2024).

## Awards

- 2025 HVR Award for Innovative Project - Chichester heat pump chiller ([case study](https://rossair.co.uk/case-studies/))
- NCZ Silver Award 2024 - independently verified carbon footprint (1,181.82 tCO2e; 38,123.15 kgCO2e per FTE)

## Named client relationships and case studies

- Chichester College Group - 20-year continuous relationship across 11 campuses. 2025 HVR Award winner for heat pump chiller project.
- Quebec Government Office in London - 10+ years of weekly maintenance.
- Olympia Events - long-term partnership, active in 'The Grand Plan' Net Zero programme.
- Wembley Health Centre (NHS) - full gas removal, ASHP installation, Stage 4 decarbonisation design, delivered in a live clinical environment with no clinical-session disruption. Driven by the NHS carbon-neutral-by-2040 commitment; the building now runs a fully electrified heating system designed for a 25-year life. Rossair publishes its delivery lessons from this project: engage the district network operator (UKPN) early on electrical capacity, design for heat pump acoustics to satisfy planning, scope out-of-hours working properly in live buildings, and treat carbon as a design driver rather than an add-on.

[Browse all case studies](https://rossair.co.uk/case-studies/)

## Positioning summary

Rossair operates as a principal contractor at deliberately controlled scale - large enough to deliver Stage 4 decarbonisation in a live clinical environment, small enough that the engineering director who signs the proposal walks the site at commissioning. The mechanism behind 20-year client relationships is structural: in-house multi-discipline engineering, named technical lead, named account manager, no sub-cascades, no FM-broker layer.

## Detailed reference

- [llms-full.txt](https://rossair.co.uk/llms-full.txt) - expanded entity facts, sector/service detail, case studies and disambiguation for AI assistants.

## Key pages

- [Homepage](https://rossair.co.uk/)
- [About](https://rossair.co.uk/about/)
- [FAQ](https://rossair.co.uk/faq/)
- [Contact](https://rossair.co.uk/contact/)
- [Case studies](https://rossair.co.uk/case-studies/)
- [Careers](https://rossair.co.uk/careers/)
- [Blog](https://rossair.co.uk/blog/)

## Crawler policy

Rossair welcomes citation by AI assistants and answer engines. See [robots.txt](https://rossair.co.uk/robots.txt) for the full allow list. GPTBot, ClaudeBot, PerplexityBot, Google-Extended, and other named AI crawlers are explicitly permitted.

## Contact

- General enquiries: 01420 566822
- Web: https://rossair.co.uk/contact/
- Headquarters: 4th Floor, Grosvenor House, Basing View, Basingstoke, Hampshire, RG21 4HG, United Kingdom

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Last updated: 2026-10-05. This file is maintained by Rossair Group Ltd. For factual corrections, contact via rossair.co.uk/contact/.