Q: My furnace is in my attic, and I recently had insulation blown in. Ever since, the air-combustion vent on my furnace is sweating and causes the ceiling to get wet. How do I stop the condensation?

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. MEMPHIS, Tenn. — With summer just beginning ...