A Heat Advisory is in effect for the area.  New Fairfield Library will be open today from 10am to 5pm and on tomorrow from 10 to 7 as a cooling center.  The Senior Center will be open today and tomorrow from 9 to 4 for cooling.  Hot temperatures and high humidity may cause heat illnesses to occur.  Seniors and those with chronic health problems or mental health conditions are at an increased risk. Homes without air conditioning can be much hotter than outdoor temperatures. New Fairfield officials urged residents to check on vulnerable friends, family members and neighbors.  To reduce risk during outdoor work, OSHA recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location.