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and 3b give credit based•pon the improvement in ene• efficiency the measure <br /> creates during the heating season. As you can surmise, the heat pump creates <br /> more efficiency than the furnace option and the credits are weighted <br /> accordingly. Installing a heat pump that meets the HSPF requirements in option ' <br /> 3b with a backup furnace with the efficiency requirements of option 3a does not � <br /> improve the efficiency of the total system additively because they do the same job <br /> and work independently of one another. Think of it this way, the heat pump will I <br /> cruise along efficiently until outdoor air temps dip below the balance point for the <br /> heat pum� (30-35 deg F) and then the heat pump will shut off and the furnace will <br /> kick on until the outdoor air temp rises up to the balance point. The majority of <br /> the hours of the year, the more efficient heat pump will be operating. Sure, the <br /> gas furnace is more efficient than electric resistance furnace as back up, but for <br /> the limited amount of time the gas furnace runs the overall benefit is not <br /> significant enough to provide any credit. <br /> Any informauon that you could provide would be greatly appre,iated <br /> J:;�NF'�T,9�1 <br /> �d vB�Gj'licRi-�BC�I'!h:��.�'� <br /> ��tq o(Cvarett <br /> �200 Cec'.:,� 5! <br /> E�er�tt�Wa 98?CI <br /> � .i' _ ._ <br /> _�� <br /> z l ?i <br />