The first modern oil ... furnace by a pump. This oil is mixed with air, atomized through a nozzle, then burned. Heat is extracted from this flame through a heat exchanger that warms air. Then this ...

It turns out the oil-burning ... array of hot water pipes — the telltale sign of a boiler. "If you have heat that comes out of a vent, you have a furnace," says John Gabrielli of Air Temp ...

A heat pump is an energy-efficient alternative to a furnace and air conditioner. A heat pump uses electricity to transfer heat from a cool space to a warm one. In the winter, it takes the heat ...