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Thermal Comfort Calculator

LED Lighting Supply’s thermal comfort calculator tool determines the comfort level and estimated productivity loss for a facility based on internal temperatures and humidity levels in hot seasons. Maintaining an operative temperature with adequate heat balance will ensure optimal thermal balance in your facility.

Temperature

Humidity

Comfort Level

Estimated Productivity Lost

Thermal Comfort Level and Productivity Chart

Temperature (°F)	Humidity (%)	Comfort Level	Estimated Productivity Loss (%)
60	30	Warm.	2.84
65	30	Warm.	1.67
70	30	Warm.	1.38
75	30	Warm.	1.81
80	40	Warm.	3.72
85	50	Warm.	9.28
90	60	Hot!	20.07
95	70	Dangerously Hot!	100
100	80	Extremely Dangerous!	100

Thermal Comfort:

Thermal comfort is a feeling of well-being experienced when a person is satisfied with the existing environment. Thermal comfort indices measure how the human body reacts to conditions of the environment such as air temperature, relative humidity, and air velocity. Hot air temperature, stagnant air, and relative humidity increase the likelihood of heat disorders for workers and reduce worker output, creating a loss of productivity and dangerous working environments. Loss in productivity results in minimized profits. Installing a commercial or industrial ceiling fan is an ideal alternative to boost worker comfort while improving energy efficiencyIn addition to utilizing the thermal comfort calculation, it is important to understand the Predicted Mean Vote (PMV). Predicted Mean Vote (PMV) predicts how occupants evaluate air temperature in a space on a 7-point scale. PMV is calculated using the following factors: air temperature, relative humidity, air velocity, mean radiant air temperature, clothing insulation level (Clo), and metabolic rate (Met).Installing a commercial or industrial ceiling fan into your facility will regulate temperatures, improve air quality, and boost thermal comfort. Request a free fan layout plan here. Our Fan Specialists have worked with commercial and industrial partners for 15+ years to ensure proper fixture count and adequate airflow with exceptional product support.

Heat Index:

The heat index is a measurement of how hot a thermal environment feels when relative humidity is present and identifies the level of danger for potential heat stress to occupants. The thermal comfort level is identified as neutral, warm, hot, dangerously hot, or extremely dangerous based on the National Weather Service Heat Index.

How Does This Tool Benefit Facility Managers?

Allows you to perform thermal comfort calculations to balance indoor climate conditions
Accounts for air speed, mean radiant temperature, and vertical air temperature difference
Incorporates thermal sensation to gauge how occupants perceive the indoor environment
Addresses heat loss through appropriate insulation and air conditioning systems
Aims for optimal thermal comfort by managing these variables effectively