A technical reference for UK air-conditioning compliance, standards interpretation, and defensible practice.

This site provides interpretation and reference material. It does not provide installation instructions or project-specific advice.

Regulations

How UK statutory requirements apply to domestic AC

Standards

How technical standards are interpreted and cited

Definitions

Formal meaning of terms that cause disputes

Failures

Common real-world failure patterns and causes

Spec vs Site

Where drawings and reality diverge

Evidence

What actually protects you in inspections or disputes

Recently Updated References

Methodology

Pages are maintained as reference entries and updated when standards or regulatory interpretations change.