Ee
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would be a frightening experience. Even though it's a harmless snake - it's still a snake - and I totally understand the fear even just seeing one can cause. I know everyone says "they're as scared of you as you are of them" but that still doesn't make me feel any better!
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Until you locate him I think I'd wear my shoes in the house. Do you have any indoor pets? They'll find him for sure. Here in GA there was just a story on the news about Copperheads being found in homes due to the lack of water outside. They're looking for a drink.

Good luck finding him and getting him back outside. Hopefully you can find the access area he used to get in there in the first place. Maybe put a shallow pan of water near a dark area and see if that's what he wants. MrsD's suggestion of a net is good, too. At least you can keep him confined until you can get him outside again.