Assertion: heat pump's heating | /r/HasProperty | expensive to use
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Source sentences:
text: \rm {COP}}_{\rm {heating}}} of 3.5, such as in the example above, could be less expensive to use than even the most efficient gas furnace except in areas where the electricity cost per unit is higher than 3.5 times the cost of natural gas (e.g. Connecticut or New York City).