The absolute cheapest way to heat a home involves combining strategic passive solar techniques with aggressive energy conservation. Open south-facing window curtains during peak daytime hours to allow natural sunlight to warm floors and walls, and close heavy thermal draperies as soon as the sun sets to trap warmth indoors. Weatherstrip exterior doors, seal drafty window frames, add thick attic insulation, lower your thermostat to 68 degrees Fahrenheit while active, and dress in thermal layers to minimize reliance on active mechanical heating.
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