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Residential HVAC work (installation, commissioning, and periodic maintenance) is often performed by small teams under time pressure and in variable site conditions. Despite being routine, these tasks involve recurring occupational hazards: chemical exposure to refrigerants and oils, electrical shock during connections and testing, falls during outdoor unit mounting, manual handling injuries, and ergonomic strain from constrained postures. This paper presents a super-simple, practice-oriented method to identify, ev...