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 ...

Dear Jim: With natural gas prices so high now, I think I should replace my old furnace even though it still works. I want the most efficient design to save money and reduce pollution. What models ...

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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 ...

Sometimes less really is more. New rules for natural gas furnaces mean this is the last winter New Jerseyans can buy traditional non-condensing furnaces, which federal officials hope will lead to less ...