Who is the best person/type of company to call to install an attic fan?....roofer, electrician, etc? My attic happens to be on the second floor of my home and is entered via door from a bedroom. No ventilation. I'm comfortable downstairs in my first floor bedroom but guest upstairs are burning up in summer unless a/c thermostat is set very low. I would prefer not to tamper with the roof if possible, but instead have ventilation put at the top side of house. Would appreciate suggestions/advice, especially from anyone who has had this problem.