The figure you're looking for is the "coefficient of productivity" or COP. It's the ratio of heat extracted to power used by a heat pump. Most units have a COP of 2.5 to 3.5 - pulling out those 1000 W of heat will require 285 to 400 W of electricity.
If you search for COP and 'air condioning' you'll find the numbers posted by various manufacturers (they'll look good in your report). Some will list EER (energy efficiency ratio) instead of COP; COP=EER/3.412.
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