<prompt> The effective temperature of the comfo zone is-69-76 o F77-80 oF83-85 oF86-90 oF  <response>: Comfo zones: In deg C of corrected effective temperature Pleasant and cool 20 Comfoable and cool 20-25 Comfoable 25- 27 77-80F Hot and uncomfoable 27-28 Extremely hot 28 Intolerably hot 30. Parks Textbook of Preventive and Social Medicine, 25th Edition, Pg 792 