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Yes, a heat pump can use considerably less electrical power when compared to resistance heating. The performance ratio is called COP or co-efficient of performance. Generally, in moderate temps, heat pumps have a 3.0 to 4.0 COP (3 to 4 times less power use compared to resistance heating). However, using waste heat from the ICE when it's running, is always the most efficient use.
If you remember, the air cooled Volkswagens used exhaust to heat the cabin, just like today's small aircraft.
A combo setup could be very efficient. In fact, I see no reason why the electrically driven AC on a Prius could not be simply reversed and used as a heat pump.
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