Bathroom fans?
 

Does anyone know a company who could install good exhaust fans in an interior bathroom for me?

I am assuming you have a fan now, so you are looking for a replacement fan, there are many handyman people that can do this type of work. I am a DIY person, so I do not have firsthand experience with anyone doing this work, but I have recently seen some posts with very good reviews of several people.

If you are having low air flow, check the outside vent, there is a screen and see if it is clogged

I used Pike Electric to upgrade my existing exhaust fans.