The passive radon-resistant features installed in most houses do not cost anything to run. In fact, sealing the home to prevent radon entry can result in reduced energy costs. While the savings will vary with the climate, size of house and utility prices, the national average is $65 per year in energy costs saved. If a fan-based ventilation system must be used, the cost of electricity to run it will average $70 per year. In addition, fans must typically be replaced at 10 to 15-year intervals at a cost of approximately $150 each. The expected energy savings from sealing the house can help offset these costs.