You can get money back from Ford once the repair is complete, but the caveat is that your rental has to be a Ford vehicle. If you are not renting a Ford, ask your rental car company to switch you.
Just a thought...A heat pump is no doubt going to have much better efficiency. The resistance heater may actually be a lot better at heating. When its -20 out, you might want a warm truck in 5 minutes instead of 15 minutes (And I am just making up those numbers). Based on videos from a...