Furnace igniters work by creating a spark to cause ignition, or by producing an extremely hot surface that ... either a tank of LPG or a natural gas supply line. Air filter: A membrane designed ...

Cities looking to eliminate fossil fuels in buildings have notched a decisive court victory. Last week, a federal judge ...

Heat pumps are an energy-efficient alternative to furnaces, which are frequently powered by natural gas, a fossil fuel. Heat pumps can replace air conditioners and even hot water heaters.