A workplace is not automatically violating federal OSHA law simply because it lacks air conditioning. The legal question is whether employees face a recognized serious heat hazard and whether the employer addresses it adequately. OSHA’s general duty clause requires a workplace free from recognized hazards likely to cause death or serious physical harm. [1][2]
Evaluate the heat exposure, not only the thermostat
Heat risk depends on workload, humidity, radiant heat, clothing or protective equipment, air movement, and acclimatization. A temperature that is merely uncomfortable for seated work may pose a different risk during sustained physical labor near hot machinery. OSHA explains that serious occupational heat hazards can be addressed through the general duty clause when feasible protective measures exist. [2]
Air conditioning may be one effective control, but it is not the only possible response. The adequacy of ventilation, cooling areas, water, rest opportunities, workload changes, and emergency planning depends on the actual work environment. A fan that moves hot air does not by itself establish that all risks have been controlled.
Do not confuse a proposed rule with an effective rule
OSHA’s heat rulemaking page continues to describe the federal heat-specific standard as proposed, including the hearing and post-hearing process. Proposed trigger temperatures and procedures should not be presented as already effective federal requirements merely because they appear in a proposed regulation. [3]
State-plan jurisdictions can impose specific heat standards beyond the federal framework. Check the state and industry before assuming a general federal description answers the entire question. OSHA’s standards page identifies state heat programs and relevant existing requirements. [2]
Document a specific safety concern
- Record the work area, shift, measured conditions, and physically demanding tasks.
- Describe access to water, breaks, cooling areas, and emergency assistance.
- Identify previous heat incidents and the employer’s response.
- Keep copies of written reports and any corrective measures offered.
A useful complaint explains the exposure and missing protections, rather than saying only that the building is hot. Workers with urgent symptoms need prompt assistance; documenting a complaint should not delay emergency response.
Other basic workplace conditions can be governed by specific rules. Compare OSHA requirements when a workplace has no running water and when employers must pay for required physical examinations to identify the rule that actually applies to the problem.
Primary sources
Sources checked: October 31, 2026.