In this work, the variation in the temperature of conditioned air and improvement in thermal human comfort by adopting different models of floor swirl diffuser are investigated. The experiment is performed in the workshop lab of Mechanical Engineering Department, LNCT, Bhopal. The aim of this study is to find out the airflow pattern and its distribution through different swirl diffusers installed at the floor in an air-conditioned room. The experiment is based on predicting the nature and behaviour of air diffused by three different types of swirl diffusers having the slot with a draft angle of 10°, 11º and 12º under different operating and flow conditions. An experiment is performed to evaluate the thermal comfort produced in a room equipped with the heat load of 1000 W load capacity with different swirl diffusers and compare their performance graphically. The graphs are plotted between temperatures of diffused air inside the room and vertical height from floor level.