Heating costs can depend on the type of furnace you have. New, energy-efficient furnaces can reduce your bill. However, a simple programmable thermostat can allow you to set your temperature lower at night or when you are not home, significantly reducing your costs. Regular maintenance will also ensure that your furnace is operating efficiently.
A standard-efficiency furnace has a life of 15 to 18 years, whereas a high-efficiency furnace will last for between 12 and 14 years. You should consider a replacement if your furnace is approaching this age.
It is recommended that you replace your filter anywhere between 3 months to 1 year. To be certain, you can visually inspect it yourself.