The key thing to understand is an energy source includes both an amount and a quality. For heat energy the quality is related to temperature. And is basically

The key thing to understand is an energy source includes both an amount and a quality. For heat energy the quality is related to temperature. And is basically the percentage of it that can be converted to 'work'. For electricity the quality is near 100%. So a heat pump moves low quality heat energy inside you house say at 65 degrees and dumps outside where it's say 90 degrees. The energy you move needs to increase in the amount of quality. The increase in energy comes from the electricity used to drive the pump.