During a power failure, a votive candle contained in glass can provide bright, continuous light for many hours and even days. A flashlight may only work for a few hours. The flame on a votive candle is also safe from drafts and sudden blasts of wind. Votive candle are widely available in grocery stores.
Clean warm-air registers, baseboard heaters, and radiators as needed. Make sure they are not blocked by furniture, carpeting, or drapes.