exhaust fans in bathrooms

[Anil J.]

I came across several posts suggesting to wire exhaust fan to the light switch in bathrooms so it turns on automatically when the light is turned on.

* This seems like it's based on assumption that people will turn on light. During Summer in California, there is plenty of light and a light is not required at all times, will people NOT turn it on?

* Does the frequent on/off of fan wear it out faster? (since we really only need it during a shower, and most people go into a bathroom for other reasons...)

What do you advise?

[Steve Morris]

They have exhaust fans with thermistors in them.  They blow until the room is dry.  Best solution, plus tenants can't screw with them.

Also, GO UP IN THE ATTIC AND MAKE SURE THE VENT IS CONNECTED TO THE OUTSIDE AND NOT BLOWING IN THE ATTIC!!!

I see that 30% of the time in units.