Thermal Comfort Checklist

What the thermal comfort checklist is

This HSE-aligned thermal comfort checklist helps you evaluate the environmental factors in the workplace that influence employee wellbeing and productivity. It covers air and radiant temperature, humidity, air velocity, PPE considerations, metabolic workload, and seasonal variation. It is suitable for offices, factories, warehouses, and other facilities, and it supports identification of heat or cold stress risks and informs appropriate corrective measures. Thermal comfort is not a single reading. It is the combined effect of the environment, the work being done, and what employees are wearing. The checklist therefore draws together direct worker feedback, site-specific details, and assessor sign-off in one record.

Why thermal comfort assessment matters

Environmental conditions in the workplace influence employee wellbeing and productivity. When workers are too warm, too cold, or subject to draughts, discomfort can build and heat or cold stress risks can emerge. A structured assessment helps you identify those risks and decide on appropriate corrective measures. Listening to employees is central. The checklist asks whether employees perceive that a thermal comfort problem exists within their workspace, and it gathers their reports on dryness, humidity, and draughts. These signals point you to the conditions that need attention.

What the assessment covers

You evaluate the workplace across several interacting factors: - **Air temperature** — whether the ambient air feels warm or hot, whether it fluctuates noticeably through a typical working day, and whether it varies significantly between hot and cold seasons. - **Radiant temperature** — identifiable heat sources such as furnaces, machinery, or direct sunlight; equipment or processes that generate steam within or near the workspace; and whether external weather conditions, including solar gain or wind exposure, influence the internal environment. - **Humidity** — whether employees report the air feels uncomfortably dry, causing dry eyes, throat, or skin, or excessively humid, sticky, or muggy. - **Air movement** — whether employees report discomfort from draughts at their workstations, and whether cold or warm air from HVAC systems, vents, or openings blows directly onto them. - **Metabolic rate** — whether the physical work rate is moderate to intensive in warm or hot conditions, and whether employees perform sedentary or low-activity tasks in cool or cold environments. - **PPE** — whether vapour-impermeable PPE is required that may impede natural evaporative cooling, whether specialised PPE is worn that protects against hazardous substances such as toxins, chemicals, asbestos, flames, or extreme heat, and whether respiratory protective equipment (RPE) is required and being worn. You also check whether employees can adjust their clothing layers individually in response to the prevailing conditions. - **Worker perception** — whether employees consider that a thermal comfort problem exists in their workspace. The assessment also records who prepared it, where it was conducted and when, and who signed it off.

How to carry out the assessment

1. **Record the basics.** Note the date and time of the assessment, the location, and the person who prepared it. 2. **Assess the environment.** Work through air temperature, radiant temperature, humidity, and air movement. Look for heat sources, steam-generating equipment or processes, and any influence from external weather such as solar gain or wind exposure. 3. **Consider the work and what people are wearing.** Judge the physical work rate — moderate to intensive in warm or hot conditions, or sedentary in cool or cold environments — and note any PPE that could impede natural evaporative cooling or that protects against hazardous substances, flames, or extreme heat. Confirm whether respiratory protective equipment is required and being worn, and whether employees can adjust their clothing layers. 4. **Ask the workers.** Gather direct feedback on draughts, hot spots, and cold spots, and on whether the air feels dry or humid. Ask whether they perceive a thermal comfort problem in their workspace. 5. **Document and close out.** Record the site-specific details and the answers on the yes/no/not-applicable scale, note whether the inspection has been finished with start and end dates and the assessor's signature, and use the findings to identify heat or cold stress risks and decide on appropriate corrective measures.

How to use the checklist

Keep the record factual and site-specific. For each item, answer **Yes**, **No**, or **N/A** as it applies to the area being assessed, and capture the conditions you observed alongside what employees told you. A 'Yes' to an item such as employees reporting discomfort from draughts, or air blowing directly onto them, is a prompt to look further at the cause and decide on corrective action. Completing the assessor details, location, and dates gives the record context, so anyone reviewing it later can see when and where the conditions were observed.

Frequently Asked Questions

The checklist covers ambient air temperature, radiant temperature, humidity, air movement and draughts, metabolic rate and physical workload, and PPE. It also records observations about heat sources, steam-generating equipment and processes, and how external weather conditions influence the internal environment, and it collects direct worker feedback on draughts, hot spots, and cold spots.

You record the conditions in the work area, including air and radiant temperature, humidity, and air movement. You note heat sources, steam-generating equipment or processes, and whether the internal environment is affected by external weather such as solar gain or wind exposure. You capture what employees report about dryness, humidity, and draughts, consider the physical work rate and any PPE that may impede natural evaporative cooling, and document the site-specific details with assessor sign-off.

It matters because environmental factors in the workplace influence employee wellbeing and productivity, and the assessment supports identification of heat or cold stress risks. By gathering direct worker feedback and documenting the conditions alongside the activity and PPE in use, you can judge whether a thermal comfort problem exists and inform appropriate corrective measures.

The checklist is suitable for offices, factories, warehouses, and other facilities. It is aligned with HSE practice and covers environmental factors such as air and radiant temperature, humidity, air velocity, PPE considerations, metabolic workload, and seasonal variation.

A good assessment looks at air temperature and whether it fluctuates or varies with the seasons, radiant temperature from heat sources or solar gain, humidity and how dry or muggy the air feels, and air movement including draughts and air blowing directly onto employees. It also considers the physical work rate in warm, cool, or cold conditions; PPE that may impede cooling or that protects against hazards; whether employees can adjust clothing layers; and whether employees perceive a comfort problem.

Written by

Arne Reis

Founder

Process optimizer with 25 years of expertise, focused on operational excellence in quality, maintenance, EHS, and commissioning. Emphasizes innovative solutions and top-quality standards.

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