I guess I would invest in the market leaders in Europe? These links have some market share and forecasts, this is not really my area so I have no if the sites below contain bias.

https://www.factmr.com/report/europe-air-conditioning-system...

https://www.prnewswire.com/news-releases/european-air-condit...

https://www.hvacinformed.com/companies/distributor-western-e...