It's perfectly acceptable to have a high-efficiency furnace installed with one pipe. Just flip through the pages of any high-efficiency furnace installation manual and you'll find the answer. I'm ...

Newly-manufactured indoor residential gas furnaces will have to be at least 95% efficient starting in late 2028 under a new rule issued by the U.S. Department of Energy (DOE). In an effort to save ...

Last week I began a reply to J. McC.’s questions about replacing his 1920s gravity warm air furnace (the “octopus”) with a new forced-air furnace. He was also concerned about how to find a ...

Skipping the manufacturer's instructions during installation may result in a furnace that fails within six months or less. For example, heat exchangers can crack from improper venting, and gas valves ...

Dear Jim: We are retired and our interest income from bank CD's is not what it used to be. I thought about replacing our gas furnace to lower our utility bills. What is the most efficient design ...