If you need to purchase a gas-burning forced-air furnace but aren't sure how they work, here's what you need to know.

Add Yahoo as a preferred source to see more of our stories on Google. Heat pumps run on electricity and furnaces run on fossil fuels, natural gas, propane, or oil. Our experts say there's no clear ...

Heat pumps run on electricity and furnaces run on fossil fuels, natural gas, propane, or oil. Our experts say there's no clear answer for which type is more energy efficient. Location plays a major ...