The UK has a substantial ventilation and air conditioning industry, worth around £1.2 billion currently. The main sectors within this are products for air conditioning, and ventilation and accessories, with the former making up more than 50% of the whole market value alone.

At Global Database we've used the data held in our electricity, gas, steam and air conditioning supply B2B directory to create a list of the industry's biggest companies. View the results below to see which UK businesses are currently turning over the most revenue in the industry.