There may be specific trade publications to aid your research. I would also reach out to your local college(s) if they happen to have HVAC training programs, as I would expect the program staff would likely have resources to draw upon. Finally, there had been provincial and federal incentives for the adoption of Heat Pumps (programs may have sunsetted by now - may want to double check). As a measure of program effectiveness, the respective government agencies running the programs may have compiled some stats.
Also to note, the absence of those programs may negatively impact the sector, although in BC, I would argue the province is still likely ripe for growth in HVAC - still lots of older homes and apartments without AC, and AC on new builds is a must-have.
Good luck!