I've got the same Harbor Freight heater. It barely does anything.
For defogging - running ANY air over the windshield seems to work fine - although cold air blowing through the defroster isn't exactly comfortable.
A couple of guys in the Milwaukee EV club were working on installing 1500 watt ceramic heaters last week. There is another meet tomorrow. I am only going to be able to stop by briefly, but maybe I can at least get an update on their heaters.
Last winter, I was pre-heating off wall power with a 1500 watt AC oil-filled electric radiator. IT WORKED GREAT!!! So nice and warm to hop in the car. It was on a timer. My schedule this winter isn't nearly so regular, so I haven't been using that heater and timer.
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