. 2016 Jun 20;61(1):87–101. doi: 10.1007/s00484-016-1193-0

Table 1.

Ranges of PMV, PET, and adaptive PET for different grades of thermal perception and physiological stress (sources—according to Matzarakis and Mayer 1997; De Dear and Brager 1998b)

PMV	PET (°C)	Adaptive PET			Thermal perception	Grade of thermal stress
PMV	PET (°C)	Cool period	Mild period	Warm period	Thermal perception	Grade of thermal stress
−3.5	4	4	6	8	Very cold	Extreme cold stress
−3.5	4	4	6	8	Cold	Strong cold stress
−2.5	8	8	10	12	Cold	Strong cold stress
−2.5	8	8	10	12	Cool	Moderate cold stress
−1.5	13	13	15	17	Cool	Moderate cold stress
−1.5	13	13	15	17	Slightly cool	Slight cold stress
−0.5	18	18	20	22	Slightly cool	Slight cold stress
−0.5	18	18	20	22	Neutral	No thermal stress
0.5	23	23	25	27	Neutral	No thermal stress
0.5	23	23	25	27	Slightly warm	Slight heat stress
1.5	29	27	29	31	Slightly warm	Slight heat stress
1.5	29	27	29	31	Warm	Moderate heat stress
2.5	35	34	36	37	Warm	Moderate heat stress
2.5	35	34	36	37	Hot	Strong heat stress
3.5	41	40	42	43	Hot	Strong heat stress
3.5	41	40	42	43	Very hot	Extreme heat stress