This question has options. How would someone go about accomplishing this goal?
How to warm a room without any internal heating?

+ Place carpets, rugs or blankets on the floor of the home throughout the room to keep the cold air from entering through those crevasses. + Place carpets, rugs or blankets at the foot of the windows and doors in the room to keep the cold air from entering through those crevasses.
Place carpets, rugs or blankets at the foot of the windows and doors in the room to keep the cold air from entering through those crevasses