The baffle causes the bathroom to be cold and drafty.  If only the batroom is cold replace the fan (and baffle).  cost $20.  Savings may be $10 to $50  each winter month.
$5 and 15 minutes per room can help a lot.  It's EASY!
Hint... Heat is lost in 3 totally different ways... and most insulation slows only one of them.
(Movies) Let the EARTH heat your home.  And it pays for itself in 1-2 years.
Frequently Asked Questions
Explains the 3 ways heat is lost in winter, and how heat is gained in summer.
Be a heat loss detective.  TIP: You'll need smoke and candles... a magnifying glass won't help
Select the right insulation for your application.  (You may be suprised.)
Cause, Affect, and what to do now.
Products and services to help you save energy
Easy and inexpensive. Convert your basement from and waster...  to an energy PRODUCER
Products and services to help you save energy
Places to check first. Most of your heating dollars are probably being lost here.
On-site heat loss, pest infestation, and moisture damage, detection services. (Only near Chicago, IL)
My favorite energy savings websites
First... Stop throwing money,
and heat, out the window
(click on the open window)
For best savings results: Work from the top of the house down