Different Types of Gas Furnaces

 Different Types of Gas Furnaces

Closeup Shot Of Home Furnace Burner Ignited

This side-by-side comparison of gas furnace types makes understanding your options much easier.

When it’s time to replace your gas furnace, you’ll have to make some important decisions that will impact your comfort and wallet for years to come.

“A furnace is a significant investment.” “Learning about the many types of gas furnaces available can help you make a more informed decision.”

A study shows that furnaces built after July 2019 must-have new high-efficiency blower fans. It, if you’ve been putting off replacing your furnace, now is a terrific time to do so.

Here are some helpful comparisons to help you decide what type of new furnace best fits your needs.


The top HVAC brands can guide you to the right gas furnace for your home.

Single-Stage and Multi-Stage Furnaces


The gas is delivered to the furnace burner at the same pace in a single-stage furnace. The burner heats the air to the same temperature: hot.

A multi-stage furnace adjusts gas flow and burner intensity to heat your home more pleasantly and efficiently. The most basic multi-stage furnace is a 2-stage design that provides low heat most of the time and high heat when needed during cold winter days. A modulating multi-stage furnace effortlessly delivers just the perfect amount of heat to rooms in your home by varying burner intensity in 1-percent increments.

Side-by-Side Comparison

Cost: The cost of a single-stage furnace is lower. Repairing it is also less expensive.

If you don’t want a powerful blast of hot air every time your furnace kicks on, a multi-stage furnace is a way to go. Unless the burner is at maximum intensity, multi-stage furnaces are also quieter than single-stage furnaces.

Efficiency: The multi-stage furnace is more efficient, which is especially important in cold climates where the furnace is used for months at a time.

Single-Speed and Variable-Speed Furnaces


A blower fan in a single-speed furnace is always running at a high speed.

A fan on a variable-speed furnace has more speeds. Variable-speed furnace fans come in two varieties:

There are two speeds on a multi-speed fan: low and high. The fan usually runs at moderate speed for about 75% of the time, only increasing to high speed when necessary to reach the thermostat setting.

  • Within the range of a variable-speed fan, there are an endless number of speeds. The speed is usually controlled by an electronic control board. For a smooth heating transition, the fan normally begins at a low speed and gradually increases. A variable-speed fan can run practically continuously to circulate air around the house, allowing air to flow through more frequently in the air filter and doesn’t stagnate in the air ducts and become cold.

Side-by-Side Comparison

Cost: It is less expensive to buy a Lennox furnaces with a single-speed blower fan motor. Repairing it is also less expensive.

Comfort: The variable-speed blower fan motor in your home’s room air vents is quieter and provides smoother heating. With a variable-speed blower, you’ll save money on electricity and feel more comfortable in your house, despite the higher cost.

“Don’t be intimidated by the number of options available when purchasing a new furnace.” Be confident in your understanding of the many types of furnaces and choose the one that best suits your demands.”

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