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what you should do is get a oil heater and a coolant heater, hard wire the two together then put a 120v switch in your car and hard wire a trickle charger after the switch so then you plug in the car the trickle charger maintains the batteries and when you wake up to go to work you flip the 120v switch to run the heaters for 15 to 20 minutes.(if you run a 550 watt coolant heater and 2 150 watt oil heaters for 18 hours at night where i live thats 41 dollars or more a month not worth keeping the heaters plugged in all night if you ask me)
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