Most noncondensing residential furnaces use natural draft to drive the combustion process. Even 80%-AFUE furnaces with combustion blowers are natural-draft furnaces. The combustion blower in an 80% ...

If your gas furnace keeps cycling on and then turning off within a minute or so, it might be the result of a dirty flame sensor. Most gas furnaces have a small sensor designed to shut off the furnace ...

The presence of unburned fuel in a power plant’s ash indicates an inefficient combustion process, as some of the energy in the fuel is being wasted. Unburned fuel also poses a risk to safety; if ...

Q: We have a high-efficiency condensing furnace that vents out a side wall. Should I be concerned about the icicles I see built up on the plastic pipe outside the house? -M.C. Kalamazoo. A: No. What ...