Only AC systems over 12kW need to have their energy efficiency assessed. Systems over 250kW must have had their first inspection by January 4 2009. Systems between 12 and 250 kilowatts must have had their first inspection by 4 January 2011.
After this first inspection, systems must be inspected every five years.
If your system was installed on or after January 1 2008, the first inspection must take place within five years of installation.
The inspection must be made by a trained and accredited energy assessor.
It includes an assessment of system efficiency, a review of the system sizing and suggestions on improvements, replacements or alternative solutions.
The information and records you keep about the air conditioning systems are also checked and a report is produced summarising performance and giving suggestions for potential improvements, along with estimated savings in costs and carbon emissions.