Containing heat from a 1800w set-up?

I'm considering a 1.8kw grow set-up but I'm worried about the heat issue.

I understand a decent air conditioner would reduce a standard room's temperature considerably and consistently, but I'm not sure about the temperatures created from an A/C's vent hose if I were to have it hang outside the window.

Does anyone own a 1.8kw system who can share some advice? I'd appreciate it a lot.
 
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