So these past few days I have used my AC ceramic heater and tested out the capability of them.
It was 27F outside and with the Heater set to MAX, the car was fully defrosted in 8 minutes and 42F, in 15 minutes it was 50F and after 20 minutes it was a nice 58F inside!
I have decided to do the heating right and get the AC drained so I can install my ceramic heater core into the old heater core socket. I still have an AC heater for preheating/defrosting, but I full 1500 watt heater in the EV would be a wise thing. It will use about 15 AMPs, which isn't really that bad. I just need to find a shop to drain my AC so I can work on the installation.
I have also decided that I want to get Lithium batteries for my next set, so I have already started to save up. I am looking at 30 cell of TS-LFP100 from Thundersky, and it should give me 35 miles of range. It looks like that will cost about $3,300 which does sound like a lot, but when I looked at a higher quality/power lead acid pack, I found it would cost about $2500 for that kind of range and twice the weight with 1/10 the cycle life. I have lots of saving and research ahead of me to do.