We do have some ice on windows, that is normal. You can use heaters since electricity is available.
In toronto, some parts of new found land/nova scotia, there were no electricity for days (thousands affected). fortunately temperatures are not that bad. People use fireplace (this work even if there is no main supply). I tested mine too. That is the only way to survive assuming that gas supply is fine). otherwise if home temperature drops below zero, there can be serious damages to your home including water pipes. It is a life threatening situation.