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Why Are Gas Furnaces More Efficient Today Than They Once Were?

Do you have a natural gas furnace in your home that’s more than 15 or 20 years old? Then it’s probably a unit that wastes power every time it turns on. It isn’t just because the furnace is old and starting to deteriorate. It’s also because it has a lower energy efficiency rating than modern furnaces that have the benefit of superior construction and recent advances in heating technology.

We’ll take a look at why newer furnaces are much more energy efficient:

More effective heat exchangers

The basic component of a furnace that heats up the air is the heat exchanger, a metal container that collects combustion gas. The heat of the gas raises the temperature of the metal, and heated metal transfers thermal energy to the air. Newer furnaces have better designed heat exchangers that are more conductive and transfer a greater amount of thermal energy to the air.

Second heat exchangers

A specific kind of high-efficiency furnace known as a condensing furnace contains a second heat exchanger to help the furnace draw as much heat from the combustion gas as possible. The exhaust vapor from the first exchanger is sent over to the second exchanger, instead of simply being vented outside. In the second exchanger, the vapor condenses and releases more heat.

Electronic ignition systems

The old standing pilot light that once ignited the burners in a furnace has been replaced by an electronic igniter that heats up only as needed. This reduces fuel use because there is no longer any need for a constantly burning pilot flame through all of winter.

Variable-speed fans

The standard furnace fan is either running at top power or it’s off. It uses the same amount of energy when it’s turned on no matter what. Furnaces that have variable-speed fans can lower how much the fan runs and adjust to temperature needs in the house so that they use less power while running.

Malek Heating & Cooling offers new gas furnace installation in Winnetka, IL and throughout Chicagoland.

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