Size, efficiency, and furnace type are the most important price variables ... and their fittings must handle high temperatures and, in the case of gas and oil furnaces, flammable materials ...

The type of furnace, size of the home, energy efficiency, and labor all impact the cost of ... The brand of furnace you choose influences the price. High-end brands tend to cost more than mid-range or ...

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 ...