Out here at the edge of the wilderness they had an extra room, a piece of a basement, and forced-air heating.

As an example, rather than using forced-air heating, which requires ductwork, the space will be heated by pipes within the floor slab.

I could hear nothing except water in pipes and the faint rush of forced-air heating and the guard's steady breathing.

Hot-water systems have some advantages over forced-air heating.

This week this column will focus on forced-air heating.

The most common system in North America is forced-air heating.

There was a faint rush from the forced-air heating and a buzz from a failing fluorescent tube.

It was known for innovations like forced-air heating, steel fames, built-in electrical appliances and interior plumbing.

The forced-air heating and cooling systems found in many homes can blow dust and other irritants throughout the house.

Newer homes usually have hot-water or forced-air heating.