Safety, Occupational Health, and Jobsitepractices (OSHA and NM Occupational Health and Safety)
Which rules apply
Private-sector HVAC work in New Mexico is enforced by federal OSHA under 29 CFR 1926, the construction standards. The New Mexico Occupational Health and Safety Bureau, part of the Environment Department, runs a state plan covering public employees - state, county, municipal, and school district workers. Both sets mirror 1926, so know the standards rather than the letterhead.
Core hazards
Falls: 1926.501 requires fall protection at 6 feet in construction - guardrail, net, or personal fall arrest with anchorage at 5,000 pounds per worker and documented training. Ladders: extension ladders extend 3 feet above the landing and sit at a 4:1 angle. Electrical: 1926.404 requires GFCI protection for temporary receptacles and cords. Confined spaces: the 1926.1200 series requires evaluation, atmospheric testing, and a permit when permit-required. Silica and asbestos have their own standards, and hazard communication requires an SDS for every chemical on site.
Carbon monoxide
Never fire a gas appliance to test it before the vent is complete. CO is invisible and binds hemoglobin; carry a personal monitor in boiler rooms and tight closets and treat readings above roughly 35 ppm as an evacuation trigger.
Worked example
Two installers set a rooftop unit on a 14-foot flat roof and work near the edge without guardrails. Fall protection is required because the edge exceeds 6 feet. The compliant answer is guardrail, net, or a PFAS anchored to a rated point plus a written training record. Staying 10 feet back from the edge is not a substitute under 1926.501.
Traps
Believing fall protection starts at 10 feet; no documented training; cords without GFCI; assuming the state bureau inspects private employers; unsecured gas cylinders.