It's recommended that you leave your exhaust fan running 30-60 minutes after taking a shower. This ensures that the moisture does not linger in the bathroom which will eventually lead to various problems such as moisture build up on painted surfaced such as walls and ceilings, paint peeling and even mold in places. A great solution is to replace the fan switch with a light timer switch. With incrememts of 10,20,30, and 60 minutes, just set it and forget it!
Take caution before you take down that ceiling light in the bedroom and install a ceiling fan. Most likely the ceiling box is not rated for a fan. Fans oscillate so they need special ceiling boxes. Give us a call, we'd be glad to install these for you.