A sense of comfort is a good indicator of a healthy environment and depends on changes in temperature, wind speed or wind speed and humidity during different seasons of the year.
The principle of air conditioning should include proper control of temperature, humidity and air velocity.
Temperature control: Comfortable zone is the temperature range suitable for majority of the people. The comfortable zones are different for summer and winter due to the clothing worn in these two seasons. The effective temperature zone for summer is 20–23°C and for winter is 18–22°C. A temperature of 21–25°C is required for comfort conditions regardless of the outside temperature.
Air velocity control: Air velocity control is also an important factor. The increase in velocity results in the decrease of inside effective temperature below the outside temperature. Therefore, the velocity of air is generally taken as 6–9 m/sec, which is considered as relatively still air.
Humidity control: Dry air imparts great strain for the human body. Due to this reason moisture is added to the heated air (i.e., humidification) in case of winter air conditioning and moisture is extracted from the cooled air (i.e., dehumidification) in case of summer air conditioning. An average value of relative humidity between 40 per cent and 60 per cent is considered desirable. During the summer season 40–50 per cent is comfortable and for winter 50–60 per cent is suggested.
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