Heat....stay outta my closet!!

In the winter, I turn down my thermostat to save money on the HUGE gas bill.  My family makes fun of me, but I go around before bed and before leaving the house and close all closet/pantry doors and even make sure the shower curtains are closed....I mean, why heat the walk-in closet?  Isn't that a few extra square feet that our heater doesn't have to warm?  I also close down all blinds and curtains.  In my defense, some of my heat outlets are located on the floor close by the showers, closets and windows... it seems like they would blow right toward them if I didn't patrol it!!  LOL !!  Every little bit, right?!?!