Gas Furnace Prices, and Installation Costs 2021

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Gas Furnace Prices, and Installation Costs 2021

The average cost to replace a gas furnace is $3,000 for a 100,000 BTU furnace. The total price range is $1,800 to more than $4,500 for smallest available size. A heating load calculation is necessary to determine the correct size of furnace to install in the home. See below gas furnaces prices sorted by brand, size and efficiency (AFUE).

Furnace Replacement Cost Breakdown

Gas furnace prices are determined by a variety of factors. In some cases, installation can be complicated by the location of the furnace, how much ductwork is required for proper installation, and the type of fuel the furnace uses.

  • Furnace only – 90% or higher AFUE: $995 – $3,600
  • Furnace only – 80% AFUE: $700 – $2,400
  • Furnace size for the housee: (40000 BTU – 120000 BTU) $400+
  • Installation labor cost: $1,00 – $2,000
  • Potential extra costs: (ductwork: $3,000 – $4,000; plenum: $150-$300; cold air return: $200-$400; ) $400 – $1,000+

Your installation professional will be able to evaluate your home and offer a detailed heating installation estimate so that you don’t have to worry about hidden costs. The brand, size, and efficiency rating of the furnace will also affect pricing, so be sure to shop around and find the right products to fit your home and your budget.

Gas Furnace Prices by Leading Brands

When installing a new furnace heating unit, brand and associated costs can be an important decision factor. The top furnace brands offer a price point to fit any budget from low cost forced air heating units to top performing furnaces.

Furnace Brand*Furnace Only**Estimated Minimum Cost Installed
Amana$950 $2,750
Average Furnace Cost$1,114$2,913
*Price for smallest available size of the furnace. Cost of living and regional pricing differences affect actual prices.
**Estimated Minimum Cost Installed is an estimate of the furnace, including installation cost, and no other accessories. Price for smallest available size of the furnace.

Some brands have advanced features such as an air pressure switch, variable-speed motor, air filtration system and electronic ignition. These advanced features can reduce noise, trap dust particles and increase efficiency. Furnaces may also have smart features that improve efficiency by automatically adjusting the output to the exact amount of air needed.

Gas Furnace Prices by Size

Furnaces come in all shapes and sizes, making the question “what size furnace do I need?” a little more complicated than just picking between small, medium or large.

Of course, the home is one of the most obvious determining factors for your furnace size. Both small rooms and large rooms actually make a difference. Additionally, the orientation of the home should be inspected such as whether living areas are facing south because they will heat more during the winter.

The home’s construction and insulation is also a factor. For instance, a brick home is more insulated than a house with wood siding.

Furnace Size Average Total CostSquare Feet
40,000 BTU$2,400700-1100 sf
60,000 BTU$2,8001200-1500 sf
80,000 BTU$3,2001600-1900 sf
100,000 BTU$3,6002000-2400 sf
120,000 BTU$4,0002500-3000 sf

A properly sized furnace for your home has enough heating capacity, as measured in British thermal units per hour (BTU/h), to provide heating comfort throughout your home.

Gas Furnace Prices by Efficiency (AFUE)

When it comes time to replace your home’s furnace, you have essentially two options when it comes to efficiency – “standard” or 80% efficiency and “high efficiency” or 95%+. The energy savings sounds tempting, but is replacing your standard furnace with a high-efficiency unit the best choice?

Energy Efficiency

If you’ve been looking at various types of furnaces, you’ve probably noticed that they all have what’s referred to as an AFUE rating. This number is a reflection of the energy efficiency of the furnace, and will typically be between 80% and 98%. The higher the number, the more energy efficient the furnace is.

Single-Stage vs. Two-Stage Heating

Single-stage heating uses a fixed gas valve and a one-speed motor to provide a single heat setting. Two-stage heating, on the other hand, uses a two-stage gas valve and a variable-speed motor, allowing for multiple heat settings you can adjust depending on the weather.

Furnace Efficiency Rating (AFUE)*Furnace Installed
80% 1-stage$1,700 – $2,400
80% 2-stage$1,900 – $2,600
90%+ 1-stage$2,300 – $2,900
90%+ 2-stage$2,500 – $3,100
90%+ Variable$2,600 – $3,700
*Price for smallest available size of the furnace (40000 BTU).

Although you should always take the AFUE rating into account when you’re purchasing a furnace, that doesn’t mean that you should necessarily go with the model that has the highest efficiency rating. Depending on your heating needs, an 80% AFUE furnace may be able to get the job done just fine without forcing you to incur the greater costs that come with the higher efficiency models.


Warranties are some of the most important factors to consider while buying furnaces. If the warranty isn’t valid, you might be forced to pay for all basic repairs and replacements out of your pocket, which can burn a hole in your pocket.

Manufacturer Warranty

The manufacturer warranty is an agreement with the company that made the equipment and comes with your purchase. These warranties typically offer limited coverage that begins when your equipment was purchased or installed, with the option for extended coverage upon registration.

BrandsGeneral PartsHeat Exchangers
Amana10 or 12 years20 or Lifetime
Carrier10 years20 or Lifetime
Goodman10 or 12 years20 or Lifetime
Lennox10 years20 or Lifetime
Rheem 10 or 12 years20 or Lifetime
Trane10 years20 or Lifetime
Napoleon 10 years Lifetime

Labor Warranties

Labor warranties, are provided by the company that installs your equipment. These warranties are important because HVAC performance depends heavily on whether the system was installed properly. A great installation results in a great performance for many years. A sorry installation usually results in a sorry performance, and it might only last a few years.

Basically, our philosophy is that since we installed the system, we know it’s going to work the way it should. As long as we’re in a position to keep the system in proper working order (that’s where the service agreement comes in!).

GSHA Services, LTD offers an HVAC maintenance program which HVAC Repairs Included. Starting at $45/month, our “GSHA PROTECT Home Maintenance Program” is designed to keep your home or business’s heating and cooling systems running when you need them most. Regular HVAC maintenance can help you save money by improving the overall efficiency of your heating or air conditioning system; plus, it helps prevent unexpected breakdowns, saving you the time, expense, and hassle of frequent repairs.

GOLD “GSHA PROTECT Home Maintenance Program”
Heating & Cooling Maintenance Program
Priority Service – Our Members are taken care of first.
15% discount on HVAC Repairs.
$400 Equipment Purchase Credit.
Same day appointment for no heat/cool service call.
One pre-season A/C tune-up and inspection.
One pre-season furnace tune-up and inspection.
One pre-season tune-up humidifier.
One pre-season tune-up water heater.
Maintenance reminders.
Prescheduled Maintenances.
Service Fee Applied Toward Repairs.
Option for Front Line Service.
HVAC Repairs Included.
$450/yr or $45/mo

Companies that are confident in their installations typically offer a better warranty.

3 Most Important Features Consider When Buying a Gas Furnaces?

Single-Stage vs. Two-Stage Furnace

Single-stage furnaces operate at full capacity, regardless of the surrounding climate and the homeowner’s heating needs. A two-stage furnace, on the other hand, runs at low capacity by default. If the low setting isn’t providing enough heat to meet the homeowner’s demands, it will kick over to the high-capacity setting.

While single-stage furnaces are cheaper than two-stage heaters, the latter is more efficient, making them a better deal in the long run. According to Angie’s List, single-stage furnaces have an annual fuel utilization efficiency (AFUE) of approximately 80 percent. In comparison, two-stage furnaces have an AFUE of 98.5 percent. The higher the AFUE, the less energy the furnaces uses to achieve its target temperature.

Variable-Speed Blower

Variable-speed blowers adjust the rate air is delivered when less heat is needed. They also make less noise, and produce fewer drafts and uncomfortable swings in temperature. ECM variable-speed motors are the most efficient because they incorporate a number of smart features that allow them to adjust for the exact amount of air needed and there is no wasted energy.

Furnace Installation

You could purchase the best furnace on the market, with all the features that promise to provide you years of comfort. Unfortunately, if any furnace is not installed correctly, you’ll never achieve those results. If you take one thing away from this guide, understand that the importance of proper installation is key for both performance and your safety.

And if you’re ready for your free in-home estimate to replace your existing furnace and upgrade to a modern system, we hope you’ll consider GSHA Services, LTD.