For Starters, a proper maintenance can have a big effect on fuel bills and should be performed on a routine basis.
 Clean or replace air filters regularly.
Clean registers. Warm-air supply and return registers should be kept clean and should not be blocked by furniture, carpets, or drapes.
Keep registers and return airs clean and unrestricted by furniture, carpets, or drapes.
Tune up your system. Gas-fired systems should be tuned up and cleaned every year, and heat pumps twice a year. Regular tune-ups not only cut heating costs, but they also increase the lifetime of the system, reduce breakdowns and repair costs.
Seal your ducts. In homes heated with warm-air heating, ducts should be inspected and sealed to ensure adequate airflow and eliminate loss of heated air. It is not uncommon for ducts to leak as much as 15-20% of the air passing through them. And, leaky ducts can bring additional dust and humidity into living spaces. Thorough duct sealing costs several hundred dollars but can cut heating and cooling costs in many homes by 20%.
Check for wasted fan energy. If your furnace is improperly sized or if the fan thermostat is improperly set, the fan may operate longer than it needs to. If you're getting a lot of cold air out of the warm-air registers after the furnace turns off, have a service technician check the fan delay setting.
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