Furnaces that burn oil, gas, or propane must vent exhaust to prevent toxic gasses such as carbon monoxide from building up inside the home. Inevitably, some heat escapes with the exhaust ...

Modern residential gas furnaces combine natural gas or propane with air, then burn this mixture internally to create heat.

A home furnace is a critical ... your home via a network of ducts. Furnaces can be powered in a variety of ways, such as by ...