The comfort range of temperature and humidity has been determined by ASHRAE after carrying out extensive and lengthy studies asking many people about the best  condition they feel comfortable when exposing them to different ranges of temperature and humidity. Almost 95-98% of those asked agreed that they feel very much comfortable in winter when the indoor temperature rises 21oC  and in summer when the temperature fall to 24oC. The best relative humidity is 50%. So you can adjust your air conditioner to work within this range. A difference of 1 or 2 degrees of temperature is hardly felt by occupants.

Dear Mehdi. As you mentioned, in offices the occupants have various thermal sensations because of their differences in clothing thermal resistance, metabolic rate and other physiological parameters. So, one of the best ventilation systems for offices is personalized ventilation. If you need more information aboat these systems, i hope to help you. Goodluck