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A gas furnace is a part of a heating system, the purpose of which is to convert gas to heat. Gas furnaces are most commonly used in residential systems in cold weather climates.


There are two main types of gas furnaces: conventional and condensing. Within these two main types, furnaces are further classified as single stage, dual stage or modulating.


A gas furnace consists of two parts, an outdoor air conditioning unit and indoor furnace that work together to draw in, heat and circulate winter air and cool, then circulate, warm summer air. These two units contain components including a burn, flue and heat exchanger that contribute to making the


Most gas furnaces contain five main parts, all of which are essential to the heater functioning properly. The components include a burner, heat exchanger, ductwork, a flue or vent pipe and an ignitor to start the process.


The Family Handyman recommends that owners check their thermostat before assuming the problem causing the furnace to blow cold air is something deeper. There are several things to check at the thermostat. The switch needs to be on heat and not cool. If the fan is set to automatic it blows air, regar


Oil furnaces burn heating oil, which is similar to diesel, while gas furnaces use natural gas. Heating oil is delivered by truck to each customer and stored in an aboveground storage tank. Natural gas customers are hooked up to the local gas company lines.


The primary difference between a gas forced-air furnace and an electric furnace is the fuel source. Furnaces have used many different fuel sources throughout history. The fuel produces heat, and a blower pushes the heat through a system of vents to different areas of the home.


Gas furnaces typically don't come with air conditioning functionality. However, combination systems with both gas heating and air conditioning capabilities are available and can often use the same HVAC components, reducing installation costs.


A gas furnace should be replaced when the furnace begins making weird noises, reaches a certain age or displays decreased efficiency and after the burner flame turns yellow. Generally, a gas furnace should be replaced when the furnace costs over $500 to repair or is more than 15 years old.


Electric furnaces are cheaper upfront than gas furnaces and have a longer life expectancy. The installation process for an electric furnace is cheaper and, compared to that for gas, poses less risk to safety.