8. Change Your Furnace Filter


If you have a forced-air system, changing the furnace filter can save you some energy (up to 5 percent) and keep dust down in the house. The system will last longer and be less likely to break down. The most popular 16 X 20-inch duct filter costs around 50 cents when bought by the box. Change them monthly during heating season. Measure your air filter before shopping; they range in size from 12 X 12 inches to 30 X 30 inches. An alternative to swapping out the replacement filter is to use washable filters (around $20 each). With care, they can last five years.

Cost: Under $15 per year

9. Adjust Your Water Heater

You use more hot water in winter. Lower the water heater temperature from 140 degrees to 120 degrees. And take showers, not baths. According to the U.S. Department of Energy, the average bath consumes up to 25 gallons of hot water, while a five-minute shower uses up much less — only around 10 gallons. Equipping your showers with low-flow showerheads also dramatically reduces the consumption of water, both hot and cold.

Cost: $0

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