2000 W of heat transfer is not the same as 2000 W of electrical power draw. Heat Pumps move more heat energy than they consume in electrical energy. This ratio is called the Coefficient of Performance (CoP). A unit with a CoP of 2 would move 2 watts of heat for every electrical watt consumed.
For real world AC's, the theoretical max CoP is around 14ish. A world class unit might be around 10. A good unit would be around 5-8. An average unit is around 3. This Dometic is around to 2.8. I would not call this a very energy efficient AC.
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