Which is better, single or 2 stage furnace?

Author: Adrianna Yundt II  |  Last update: Friday, July 11, 2025

If you want a cheap, reasonably effective furnace for your small home or apartment, a single-stage furnace works best for you. However, if you need to heat a larger property while ensuring energy efficiency and long-term energy savings, choose a two-stage furnace.

What are the disadvantages of a 2 stage furnace?

Cons. Two stage furnaces are generally a solid choice for most homeowners, but they cost more than single stage. They also will require a new thermostat if you are transitioning from a single stage furnace in order to control the additional low-to-high fan options being added to your home.

Is a two-stage furnace worth the extra cost?

Two-stage furnaces cost more to purchase and install than traditional models. But factoring in their 20-25 percent fuel efficiency advantage, and assuming a normal lifespan of about 20 years, the extra cost will be more than erased by the cumulative energy savings.

Do I need a single stage or two stage furnace?

A single-stage model may be a good choice if you're not worried about maximizing your fuel usage or don't mind higher utility bills. Two-stage systems and modulating furnaces need to be vented out the side of the home. There are certain situations where new or additional flue lines cannot be run.

Does 2 stage furnace last longer?

The incorporation of ECMs (Electronic Commutated Motors) in two-stage furnaces means fewer on-off cycles, reducing system stress and prolonging furnace life. This, combined with the furnace's ability to operate mostly at low capacity, significantly enhances energy efficiency.

Single Stage 🆚 Two Stage Furnace: Complete Review | HVAC Training 101

Does a 2 stage furnace need a special thermostat?

If you plan to upgrade your HVAC equipment from a single-stage to a high-efficiency two-stage or variable speed unit, your current thermostat or control system may not be designed to accommodate the additional energy-efficient features.

What is the most reliable gas furnace brand?

The 5 Best Furnace Brands
  • Carrier Furnace: Best Warranty.
  • Lennox Furnace: Best Company Reputation.
  • Bryant Furnace: Best for Durability.
  • Trane Furnace: Most Years of Experience.
  • Amana Furnace: Best for Efficiency.

Are single stage furnaces good?

Single-stage furnaces are great at heating smaller homes and apartments. However, they can struggle with heating large, multi-story properties. Rooms near warm air vents might heat up more quickly than other areas, tricking the furnace into thinking that the entire house is warm.

How much quieter is a two-stage furnace?

The 2-stage furnace, particularly when equipped with a variable speed blower, is generally quiet during its low-stage operation, which occurs about 80% of the time.

Is two stage HVAC worth it?

A multi-stage AC can be worth it if you seek improved comfort, energy efficiency, and quieter operation over a single-stage AC. It adjusts cooling based on temperature needs, providing consistent comfort and reducing energy consumption, making it a good long-term investment despite the higher initial cost.

How much is a new 2 stage furnace?

Single-stage furnaces typically range between $5,500 and $7,500. Two-stage furnaces typically range between $8,000 and $12,000.

Why does it cost so much to replace a furnace?

As more efficient units become increasingly popular, the supply of cheaper, less efficient furnaces is decreasing, so even their prices are going up. Cost of Materials: Furnace parts are expensive to make. The cost of materials used to produce them can fluctuate, especially when there are shortages.

How do I know if I have 1 or 2 stage heating?

If you have a conventional forced air heating system: If you only connected a wire to the W terminal on your Lyric thermostat, you have a single stage heating system and should select 1. If you connected a wire to both W and W2, you have a two stage heating system and should select 2.

How long does a single-stage furnace last?

What is the average life of a residential furnace? A furnace that receives regular maintenance can last at least 15 to 20 years, but completing annual maintenance and being diligent with repairs can extend the life of a furnace even longer.

How many BTU furnaces do I need?

It's recommended that a furnace has 30 to 60 BTUs per square foot. The actual number depends on the climate which we will get into in the next section. But, just for example, if you have a 1500-square-foot home and live in a warm climate, you will multiply 1500 by 30.

Which is better, a 2 stage or variable speed furnace?

Two-Stage: Two-stage furnaces offer a high and low mode, enabling greater efficiency. While not the most efficient furnaces available, they are a step above single-stage furnaces. Variable-Speed: Variable-speed furnaces have greater efficiency and energy savings than single- and two-stage furnaces.

What brand of furnace is the quietest?

Top Quiet Furnace Brands
  • Trane. Trane is widely regarded as one of the top brands when it comes to quiet operation. ...
  • Carrier. Carrier is another leading furnace brand that prioritizes quiet operation. ...
  • Lennox. Lennox is known for its energy-efficient models, but it also excels in noise reduction. ...
  • Rheem. ...
  • Amana.

How much is a new furnace for a 1000 square foot house?

Conclusion. In summary, the average cost of a furnace for a 1000 square foot home can range from $2,500 to $5,000, depending on various factors.

Is Goodman a good furnace?

Goodman has furnaces with 80% to 98% Annual Fuel Utilization Efficiency (AFUE) ratings. The AFUE rating is a standard rating required for all heating systems, and the 98% AFUE rating of the Goodman GMVM97 Gas Furnace means that 98 cents of every dollar is used as energy to warm a home.

What type of furnace is most efficient?

The most efficient Furnace you can buy is a 98% modulating variable speed furnace. Almost every manufacturer has a variation of this type of furnace. With that said this is one of the most expensive to buy and install. Also, not every home can have this style of furnace due to various factors like duct system design.

Do 2 stage furnaces break down more?

ECMs (electronic commutated motors) are a main feature of a two-stage furnace. Since these furnaces cycle on and off less frequently, the system has less stress. This means your furnace will have fewer breakdowns and an extended operating life.

Does a 2 stage furnace use more electricity?

For two-stage designs, the DOE test procedure consistently shows a reduction in energy consumption by about 3% compared to single-stage furnaces at the same AFUE level.

What is the labor cost to install a furnace?

Labor: Typical labor costs can range from $50 - $100 per hour for a licensed technician. Each additional team member will be an additional charge. Depending upon the complexity of the job, a new furnace installation can take 10-15 hours!

What is the most common residential furnace?

Understanding the Main Types of Furnaces

Today, the most common type of furnace in a home is the natural gas furnace, which utilizes gas via a pipe into the home from a municipal line.

What is the most expensive part of a furnace to replace?

Identifying the Priciest Component: The Heat Exchanger

Due to its complex role, a failure or crack in the heat exchanger can lead to serious issues, including dangerous carbon monoxide leaks. This makes furnace repair essential to maintain safety and functionality.

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