There are four types of furnaces: natural gas, electric, oil, and propane. "If you see a visible flame or hear a burner sound ...

For example, a standard gas furnace can cost between $2,500 ... give you an accurate estimate for the price of a new furnace, including installation.

National Fuel advises homeowners to be prepared and safe this winter and pay attention to outdoor gas meters, furnaces and vents. Snow, ice and extreme cold temperatures can pose a ...