I thought I would write a quick little post as I wait for my car to warm up. (It's only been 30 minutes, I have about 10 more minutes to wait).
Here are some signs you need to replace your front door LOL:
First: You have to chisel ice from your dead-bolt just to get it unlocked, and you should probably NOT touch said lock, for fear that your fingers may freeze to the metal :-)

Second: It looks as though some alien fungus has crawled through the cracks and is invading your home. In fact it is ice! Creeping through the obviously broken seal in your door LOL

Third: Though the frosted window look is sometimes hip, it is NOT hip that it is REAL FROST
While I am making light of my situation here (after all it is almost 30 below zero at my home at this very moment), this moisture problem is real and should NOT be taken lightly. There are MANY issues that could/should be addressed here and please feel free to add info :-)
When you see ice building up as in my pictures, the humidity in your home needs to be addressed as well as the condition of your doors/windows.
If left as is you will start to see wood rot, mold and mildew, not to mention the lack of energy efficiency!
Sara,
I love the idea that you are making the best of the situation. Boy it sounds cold where you are. Also enjoyed the blog...
Michael A. Caruso