Health effects of relative humidity in indoor environments
Human comfort is determined by a combination of the effects of relative humidity and ambient temperature. When there is excess humidity in the air, our body's ability to cool itself through perspiration is inhibited.
One way an air conditioner makes us feel cooler is by reducing the amount of moisture in the air. Maintaining indoor comfort at the right level can affect our health.
According to the US National Library of Medicine National Institutes of Health:
"A review of the health effects of relative humidity in indoor environments suggests that relative humidity can affect the incidence of respiratory infections and allergies. Nine epidemiological studies examined the relationship between the number of respiratory infections or absenteeism and the relative humidity of the office, residence, or school. The indoor size of allergenic mite and fungal populations is directly dependent upon the relative humidity. Mite populations are minimized when the relative humidity is below 50% and reach a maximum size at 80% relative humidity."
If your air conditioning system is working efficiently, it will remove the proper amount of moisture and heat from your living area, resulting in the comfortable and healthy environment you want.
If not, you may not achieve the comfort level you desire for your home or office, regardless of the temperature setting you are using, increasing the incidence of respiratory infections and allergies.