As of 2015, Home Advisor says that furnace repair costs average $200 per year in the United States. The cost to clean a furnace depends on its age, how well it has been maintained, and the availability of filters and other parts that may need to be replaced.
According to Sears, a furnace should be cleaned and serviced twice a year. Many dealers offer extended warranties for the equipment they sell. A service contract can cost between $150 and $500 per year, according to Angie’s List. This can help to keep a furnace running efficiently as it ages, and may keep future repair costs down. Furnaces usually need replacement every 10 to 14 years, says Sears.