Baby, It's Cold Outside

 Great tips on how to keep your home warm when you don't have a heater.

• Eat enough fat! This will keep your thyroid and metabolism functioning properly, and you'll stay much warmer.
• Fill a large pot with water and let it simmer. The rising steam will keep your house amazingly warm.
• Take a hot shower or bath and use oil or lotion on your skin when you get out. It's almost like putting on another thin layer of clothing.
• Leave the warm water in the bathtub. It's like having a 25-40 gallon hot water bottle in your house.
• Put on a hat. A lot of body heat is lost from our heads.
• Turn on the lights. Incandescent and halogen bulbs create light through heat and can significantly increase temperatures in a room.
• Use a candle heater. It doesn't create as much heat as a fireplace or real heater, but will create warmth very cheaply.
• Take advantage of solar energy; place a dark rug in sunny areas of your house during the day to absorb the sun's heat.
• If can afford it, leave other heat-producing appliances on, such as computers/monitors or strong lamps.

Source: How to Stay Warm at Home Without a Heater - WikiHow