`       === More Junk Science ===  In addition to the reappearance of the issues noted above by ', paragraph 5 of ``Health Issues`` has been deleted.      The paragraph stated ``AC achieves cooling through the process of evaporation. Due to this, mucous membranes in the nose and mouth get dry...``. ', the author of the offending edit, seems to believe that air conditioners cause evaporation of water vapor, thus drying the air in the room.  This is incorrect.    For clarity, most air conditioners remove heat from a room by passing air over a coil in which the coolant, having passed from a higher pressure region to a lower pressure region, evaporates, dispersing the energy in the mass of the coolant over a larger volume, creating a volume of lower thermal energy relative to the air outside the coil.  The second law of thermodynamics dictates that some of the heat in the air will be conducted through the metal of the coil into the coolant.  The coolant is then forced into an area of higher pressure where the process is reversed, with the heat leaving the coolant outside the area to be cooled.  The evaporation that results in cooling happens entirely within a sealed system, and can not remove moisture from the air as water vapor can not pass through the walls of the coil.    If ''s belief were valid, the evaporation would add moisture to the air, not remove it.      The drying effect, as already explained earlier in the article, is caused by condensation of water vapor already in the air.  The amount of condensation (and therefore, dehumidification) can be, and in many cases is, regulated by controlling the temperature of the coils.  Specifically, keeping the coils above the dew point will prevent condensation, and may actually raise the relative humidity of the room by lowering the temperature while maintaining the absolute humidity.   Some air conditioners, as described in the section on ``evaporative coolers``''', actually do use evaporation of water vapor.  These systems do add water vapor to the air, raising the absolute humidity.    `