Plumbing, Heating and Air-Conditioning Contractors (NAICS 23822) from Industry Canada provides statistics on the number of establishments and on financial returns.
Search our main search box for trends in the plumbing, heating and air conditioning industry. Try the keywords "heating and cooling" or HVAC or air conditioning. Try combining that with trends or technology or sustainable.
For Canadian trends in the HVAC market try CBCA Complete (including CBCA Business) and Canadian Newsstand (access to Canadian newspapers online)