The concept of the “high-efficiency furnace” in popular consciousness dates back to the 1980s. That’s when the National Appliance Energy Conservation Act of 1987 required all new furnaces be 78 ...

If you notice water on the floor around your high-efficiency furnace, don’t panic. It could just be a clogged condensate line, a common problem caused by a buildup of sludge in the pipe. While it is ...