What is the Difference Between 1 and 2 Stage Furnaces?

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What is the Difference Between 1 and 2 Stage Furnaces?

1-stage and 2-stage furnaces refer to the number of heat output levels the furnace has and how it operates to regulate indoor temperature.

Here's the difference between them:

1-Stage Furnaces: These furnaces have only one level of heat output, which is typically high.

When the thermostat calls for heat, the furnace fires up at full capacity until the desired temperature is reached, then it shuts off.

They operate in an all-or-nothing manner, meaning they are either on at full blast or completely off.

This can lead to temperature fluctuations and less precise control over indoor comfort.

1-stage furnaces are generally less expensive upfront compared to 2-stage furnaces but may result in higher energy bills due to frequent cycling on and off.

2-Stage Furnaces: These furnaces have two levels of heat output: high and low.

When the thermostat calls for heat, the furnace first activates at a lower capacity (low stage) to maintain a steady temperature.

If additional heat is needed to reach the desired temperature, it switches to the higher capacity (high stage).

They provide more precise temperature control and reduce temperature swings because they can operate at a lower output level for longer periods, maintaining a more consistent indoor temperature.

2-stage furnaces are typically more energy-efficient than 1-stage furnaces because they can run at a lower capacity for longer periods, consuming less energy overall.

Although 2-stage furnaces are usually more expensive upfront compared to 1-stage furnaces, they can potentially save money on energy bills over time.

In summary, the primary difference lies in the number of heat output levels and how they regulate indoor temperature, impacting comfort, energy efficiency, and upfront cost.

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