From: muratlanne@gmail.com   
      
   I just posted this as a Yahoo comment reply and it was rejected twice for   
   violating community guidelines. I wonder if the suggestion of being able to   
   do arithmetic offended them.   
      
   A weather station that gives indoor and outdoor temperature and humidity can   
   tell you when ventilating with a fan at night will improve comfort, rather   
   than running the A/C.   
      
   The best comparison is dew points. They can be determined closely enough by   
   subtracting 1/3 of the difference between the RH and 100% from the   
   temperature, for example 65F and 70% corresponds to a dew point of 55F.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)