Let’s explore how to check furnace heating output in four steps and see what clues it provides.

A furnace heat exchanger keeps dangerous gases out of the air circulating in the building. It's a must-have on any furnace that burns gas or oil.

When you get a call for a second opinion on a red-tagged furnace, can you confidently prove or disprove the accuracy of the first opinion? What processes do you have in place to handle a red-tag ...