So my dog chewed up a wire and copper tubing for the AC Unit outside my house and broke it. I’m going to get it fixed, and it shouldn’t happen again (it is now behind an invisible fence), but in the off chance the dog gets through, I don’t want him to be able to do it again, or I’d like it to be really, really hard. He’s a husky and is very destructive.
Is there something I can wrap or encase the wiring/tubing in that will prevent or greatly mitigate against this? It has to be after the fact, I can’t unhook anything.
Bacon! 
No, really, chili powder. Wrap duct tape, sticky side out, and coat it with chili powder. Should deter Mr. Lobo. Re-apply often, at first. He’ll learn pretty quick.
Stack big cinder blocks around it … something a service tech can move out of the way but the poor puppy can’t …
Some kind of metal cage. For a Husky that better be some pretty thick rebar. And even if you do that he’ll go after it from the inside.
Old steel electrical conduit (not EMT thin-wall) will do. But getting that big enough to run copper tubing inside will be expensive.
You could try 4" plastic plumbing drain pipe – that’s big enough that most dogs can’t really get a good bite on it. Or wrap it in chicken wire and connect an electric fencer to it.
Bury it? Pile up a raised mound of dirt over it maybe? Out of sight, out of bored dog’s mind.
Our outdoor unit is in a box that covers everything, kinda like a fence all around it. We had to put a rabbit wire top on it to keep out varmits. Now if we could keep fire ants from building hills everywhere.
I’m guessing neither of you guys have ever had a Husky. 