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.

Key Takeaways 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 ...

High-emissivity coatings increase surface emissivity to values between 0.85 and 0.95, remaining stable even at temperatures ...