When I'm home alone, I never open the door unless I know who it is - there's a small window in the door so I can check first. If I don't know who it is, I open the kitchen window and talk with them from there.

We should probably be more careful even when hubby's home.

I'm also thinking of suggesting that our gas company design some sort of small notice that their customers can stick on the door to let these salespeople know we're already "taken".
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When you don't like a thing, change it.
If you can't change it, change the way you think about it.

(Maya Angelou)