Sorry for your loss.  Having heard so many stories here for the past few months, I am trying to decide what to do for the winter.  I decided to insulate it well and not use any extra heat.  It has been below freezing for the past two weeks straight with several days in the single digits.  With only the hens (8 Red Stars) and a cookie tin heater for the water, the temps have not been below 20 inside the coop.  When you design your new coop, consider full thickness fiberglass insulation and read Patandchickens ventilation info.  There is something to be thankful this Christmas-you still have your house.  Stay strong, and as someone said earlier, rise from the ashes like the Phoenix.  David