You can run all mentioned things except the electric heater from a 15 amp service.
Personally I would not put a cord thru the window for 220. I would wait the extra day to get it done right.
You can run one electric heater from a 15 amp source but not much else. You could run the 5er on propane with the 15 amp service for the battery charger and maybe a heater.
Good luck with the house.
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