Can I just throw out my air conditioner? The only thing connected to the house is a (brass?) pipe leading to my heater, what is that for?

I moved into a house that was bank owned for almost 3 years. That was 3 years ago. So the AC unit has been sitting there for 6 years doing nothing. It looked like it was opened up before I bought the house. I really want the thing gone but I don't know how to uninstall one.
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