Electric heater for Fusion Hybrid, not just Energi

I live in Maine, and on occassion it can get wicked cold. One of the challenges driving a Ford Fusion Hybrid is that when it is in EV mode the engine can cool down very quickly. Also the beginning of my drive is at lower speeds where I can mostly run in EV mode. The problem is if the heater is on, and the engine temp is too low my Fusion Hybrid will kick out of EV mode just to increase engine temp to provide heat. This is a waste of gasoline. If the Ford Fusion Hybrid had an electric heater like the Ford Fusion Energi, it wouldn't need to run the engine just to provide heat. This could improve wintertime fuel economy and provide for a warmer cabin much faster.