Learn all about your furnace pilot light — where it is, what it does, and how to troubleshoot the most common issue.

One significant area of research has been the injection of natural gas (NG ... due to its quenching effects on flame temperatures, which can destabilize the furnace operation at high injection ...

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.