Both yes and no. Under some conditions, a candle can keep a car warm, but it will not heat your entire house. You can choose a room that receives the most sunshine during the day to serve as your insulation room. To keep the heat in, light many candles and close all the doors and windows. This strategy will undoubtedly keep your space toasty warm. Pack your windows with a sheet of cloth and create a boundary wall around the room with hay or insulation to add a layer of decent insulation. Consider removing the insulation foam from an attic with a separate door and laying it outside that one room if you have one. Because of the limited area available for automobiles, it becomes substantially easy to warm the vehicle. Remember that cars are built of metal, so there isn't much insulation, to begin with. In a closed vehicle, a single candle with an outside temperature of 320 degrees Fahrenheit will keep you from freezing to death. In the same way, two good-quality candles may keep you warm in a 0 F environment. You should aim to use paraffin or beeswax in your car because it emits relatively little carbon monoxide, lowering your risk of poisoning. Warm the water in a water tub over an open flame; drinking this warm water will keep your core temperature warm. Avoid leaving the water on the flame for an extended period of time; this will release water vapor, which will saturate your clothes and render your insulation useless. Keep a gallon of kitten litter in the car at all times. The sand will serve as a great thermal mass, radiating heat and keeping the automobile warm.