Is TM44 legally required?

Yes. TM44 inspections are mandatory every 5 years for any non-domestic building with air conditioning above 12 kW combined effective rated output. Non-compliance carries a £300 fine per system.

How often are F-Gas leak checks required?

It depends on CO₂-equivalent charge. 5 tonnes CO₂e = annual; 50 tonnes = every 6 months; 500 tonnes = every 3 months. Fixed leak detection systems halve the frequency.

Which accreditations should a commercial HVAC installer hold?

REFCOM Elite (F-Gas), Constructionline Gold, CHAS, ISO 9001, ISO 14001, and manufacturer partnerships such as Daikin D1+. AccuTemp holds all of these.

HVAC compliance guides

TM44, F-Gas, ISO 14001 and the accreditations UK commercial buildings must hold.

Key facts

TM44 = every 5 years for AC systems >12 kW.
F-Gas leak check frequency scales with CO₂-equivalent charge.
ISO 14001 audits usually scrutinise HVAC records first.

Commercial air conditioning is regulated by four overlapping frameworks — TM44 inspections under the Energy Performance of Buildings Regulations, F-Gas leak checks under EU Regulation 517/2014 (retained in UK law), ISO 14001 environmental management, and contractor accreditations such as Constructionline Gold, CHAS and REFCOM Elite. Below are AccuTemp's plain-English guides covering each.

Guides in compliance

Common questions about compliance

Is TM44 legally required?: Yes. TM44 inspections are mandatory every 5 years for any non-domestic building with air conditioning above 12 kW combined effective rated output. Non-compliance carries a £300 fine per system.
How often are F-Gas leak checks required?: It depends on CO₂-equivalent charge. 5 tonnes CO₂e = annual; 50 tonnes = every 6 months; 500 tonnes = every 3 months. Fixed leak detection systems halve the frequency.
Which accreditations should a commercial HVAC installer hold?: REFCOM Elite (F-Gas), Constructionline Gold, CHAS, ISO 9001, ISO 14001, and manufacturer partnerships such as Daikin D1+. AccuTemp holds all of these.