Seeking Insights: Commercial HVAC/Mechanical System Contractors

Hi SF community! I'm researching the landscape around commercial HVAC and mechanical systems businesses, specifically around environmental gas monitoring — particularly in environments like parking structures and warehouses. We came across a business that focuses exclusively on these gas detection systems, and the owners mentioned this is a niche many traditional HVAC and mechanical contractors don’t address deeply. We'd like to hear from others in the space: is this truly a narrow specialization? Are there other insights or trends you've seen related to gas detection integration into HVAC/ventilation systems? Thanks in advance for sharing any experience or observations.