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We often see this due to switching from a gas heating baseline to a (mostly) electric heating proposed. Depending on rate structures, the electric heating demand in winter will really hurt the cost savings of the WSHPs. We usually see better savings when the client is using really nice high efficiency WSHPs with ECM motors and is also running the condenser loop in a manner that puts more of the heating load on the boiler and less on the heat pumps (ie high condenser water temp during heating).

Hope that helps.