Furnaces can be classified into two types based on their heating output: single-stage and two-stage furnaces.
Single-stage furnaces operate at a fixed heating capacity, meaning they only have one level of heat output. This means that the furnace will always operate at its maximum heating capacity, regardless of how cold it is outside. Single-stage furnaces are typically less expensive than two-stage furnaces, but they may be less efficient since they are designed to work at their maximum heating output all the time.
Two-stage furnaces, on the other hand, have two levels of heating output. They can operate at a low heating capacity when the weather is mild, and then ramp up to a higher heating capacity when the temperature drops. This allows the furnace to use less energy and operate more efficiently than a single-stage furnace. Two-stage furnaces are typically more expensive than single-stage furnaces, but they can save you money in the long run by reducing your energy bills.
Ultimately, the decision between a single-stage and two-stage furnace will depend on your budget, your energy goals, and your specific heating needs. It's best to consult with a licensed HVAC professional who can help you determine which type of furnace is best for your home.
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