My battery was drained a few times i just replaced with a new battery. I have noticed that when the car is turned off i can hear a very low humming noise from around the steering wheel or the dash,,,what could that possibly be and could it be draining my battery?

 

Aspirator for the climate control system. it shuts off after a while.

 

+1 aspirator fan. It coes on when you open the door andd shuts down about 15 minutes after you exit the car.
Take a close look at the ignition switch. There should be a small door covering the hole where the key inserts. If it sticks open then the electronics will not power down.
You can also take a cell phone on put it on video and shut it inside the trunk and glove box to insure thhe lamps are powering down.

 

Good read