Assertion: heat pump's operating cost | /r/HasProperty | depend on the unit’s efficiency
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Source sentences:
text: While exact operating costs depend on the climate where you live, the unit’s efficiency, and local utility costs, for a single winter season, heating costs run an average of $1,550 for a propane furnace, $850 for a natural gas furnace, $900 for an electric furnace, and just $500 for a heat pump.
text: The operating cost to the consumer depends on the cost of energy as well as the COP or efficiency of the unit.