If you own a gas-burning forced-air furnace or are thinking of buying one, understanding how they work is an important first ...

Blow-back, a reverse-flow of gases that can occur in internal-combustion based machines, is a dangerous furnace malfunction that can cause toxic gases containing carbon monoxide to build up in your ...

Modern residential gas furnaces combine natural gas or propane with air, then burn this ... for about 20 years. So for ease ...

The three main types of furnaces are electric, natural gas and oil. Like with air conditioning systems, a furnace’s size is measured in British thermal units, or BTUs. The number of BTUs ...