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My first steps would be engine coolant heater so I start off in the morning with reasonably warm fluid, and a grill block. I tend to run the fan on the lowest setting unless I'm trying to defrost/clear a window because I don't like the extra noise, and it's just about as effective at warming the cabin (hotter air rather than more warm air). Then I have seat heaters which are quite effective and very economical to run.
Interesting idea with the 12v pump though.
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