Q We had to put a new furnace in our home and they put in a flexible tube from the outside to the furnace. It was to supply fresh air for the furnace, but it seems to me like having an open window in ...

Q: Tim, I've got a forced-air furnace. Several rooms in my house are cold in the winter and are hot and stuffy in the summer when the AC is on. Most of the rooms are comfortable. Why do you think this ...

As many contractors attest, a supply air plenum is a sheet metal box attached to a furnace or air handler’s outlet and is used as a central manifold connector for other ductwork. As the air blows from ...

Main heating supply ducts need to get smaller the farther away they are from the furnace. Note how the large duct on the left narrows down. (Tim Carter) Analysis by Tim Carter Q: Tim, I’ve got a ...

One of the most cost-effective and energy-conserving measures you can take is to insulate duct or pipe runs in the unheated areas of your home. By not insulating these conduits, you are essentially ...