What is the difference between a single-stage and multi-stage furnace?

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A single-stage furnace operates at one heat output level, meaning it has a fixed operational capacity that cannot be adjusted based on the heating needs of the space. This type of furnace turns on when heat is required and runs at full capacity until the set temperature is reached, then turns off. This on/off cycle can lead to energy inefficiency because the furnace operates at maximum output regardless of the actual heating demand at any given time.

In contrast, a multi-stage furnace has multiple output levels, allowing it to adjust its heating output according to the current needs. This ability to modulate heating can result in greater energy efficiency and improved comfort, as the furnace can run at lower capacities during milder conditions and avoid the large temperature swings associated with single-stage furnaces.

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