If your business runs air conditioning, there's a legal inspection you may not know about — TM44. Here's when it applies and why it's worth more than just ticking a box.
The legal bit
Under the Energy Performance of Buildings Regulations, air conditioning systems with a combined effective rated output over 12kW must have a TM44 inspection, with a certificate renewed every five years. The 12kW threshold is reached more easily than people expect — several smaller units across a building add up.
What the inspection covers
A certified energy assessor reviews your systems' efficiency, sizing and controls, and produces a report with recommendations to cut energy use — for example flagging oversized units, poor controls or maintenance that's been let slide.
Why it's worth more than the certificate
Not holding a valid TM44 certificate when you need one can mean a fixed penalty. But the real value is the report: it routinely identifies systems quietly wasting electricity, and the savings can outweigh the cost of the inspection. We can carry out any recommended servicing at the same visit. See how TM44 sits alongside F-Gas in our compliance guide, or arrange a TM44 inspection.
Frequently Asked Questions
How do I know if my air conditioning is over 12kW?
It's the combined output of all your systems, not a single unit — so several smaller units can take you over. We can confirm whether you're in scope during a visit.
How long does a TM44 certificate last?
Five years. After that a fresh inspection is required to keep a valid certificate on the register.