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I noticed a good sized hole in an exterior wall that allows wires and things to go from my AC unit into my basement.

The problem is that the hole is a good deal larger than it needs to be and there is nothing sealing the hole, so I can see sunlight clearly through the hole.

What should I use to fill this hole in my wall preserving the important stuff going through the hole?

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hole in the wooden exterior wall

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Picture? What is going through the hole, how big is the hole? –  auujay Feb 3 '12 at 22:17
    
Also, what material is used for the wall? –  lqlarry Feb 4 '12 at 3:22
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2 Answers

I would use Duct Seal

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I'm surprised whoever installed the AC unit didn't use it, it's used all the time by Electricians and HVAC technicians.

It does not harden; so unlike foam, it can be easily removed and replaced if you have to add/remove wiring/plumbing.

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Usually all that is needed is a good outdoors silicon caulk. You can get a clear type or a paint-able white type.

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"Do your best and caulk the rest!" –  auujay Feb 3 '12 at 22:39
    
I like 'great stuff' for this sort of application. try the 'doors and windows' version. –  Trout Feb 3 '12 at 22:58
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Foam gap fillers (like Great Stuff) are very useful but are not the best way to seal exterior surfaces, because they break down faster when exposed to sunlight and/or water. An exterior-grade caulk is the way to go for a longer-lasting seal. –  Shimon Rura Feb 4 '12 at 7:10
    
Painted Great Stuff last much longer. –  Bryce Sep 5 '12 at 7:57
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