NAS Certification for
HVAC & Refrigeration Contractors.
HVAC, air conditioning, ventilation, and refrigeration contractors operate across commercial, industrial, and residential environments with significant compliance obligations. NAS provides independently assessed business compliance certification that complements F-Gas registration and mechanical engineering credentials — giving clients the business compliance assurance they need.
Why HVAC & Refrigeration Contractors Need NAS Certification
F-Gas registration and mechanical qualifications prove technical competence. NAS certifies business compliance. FM clients, housing associations, commercial property managers, and NHS estates require both before appointing HVAC supply chain partners.
NAS Basic — £349/yr
Health and safety policy and arrangements, risk assessments and method statements, COSHH, CDM duties, training, insurance and subcontractor checks — the SSIP core criteria.
NAS Bronze — £749/yr
Everything in Basic plus legal identity and licences, employers’ liability insurance, data protection, equality, complaints handling, employment terms and right-to-work checks.
NAS Silver — £950/yr
Everything in Bronze plus environmental and waste management, quality and corrective action, governance and conflicts of interest, competition law, pensions, working time and subcontractor approval.
NAS Gold — £1,150/yr
Everything in Silver plus 13 procurement modules: financial standing, anti-bribery and integrity disclosures, tax status, cyber security, ethical supply chain, sustainability and Building Safety Act readiness.
What You Get With NAS Certification
Certification goes beyond a certificate — it opens doors and gives you tools to grow.
Public Register Listing
FM and commercial property buyers verify your NAS status on the NAS public register.
HVAC & Mechanical Tenders
Access HVAC installation, service, and maintenance opportunities across FM, NHS, and commercial.
Trade-Specific Questions
Your questionnaire includes questions for your trade, so the evidence you submit matches the work you actually do.
Assessor-Reviewed Evidence
An assessor checks your actual documents, so your certificate carries weight with buyers.
Expiry Reminders
Reminders before your NAS certificate, and dated documents you have submitted such as insurance, expire.
Annual Re-Assessment
Renewal includes a fresh evidence review, so buyers know your certificate reflects current documents.
Frequently Asked Questions
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