American Standard Freedom 90 Furnaces | FurnaceCompare®

American Standard Freedom 90 Furnace Overview

The American Standard Freedom 90 is a single stage gas furnace that offers up to 92.1 AFUE. Some models of the Freedom 90 are Energy Star rated.

Available in both upflow and downflow configurations, the Freedom 90 has 11 models in a variety of sizes, with capacity ranging from 2 to 5 tons. The heating capacity of this unit is as high as 113,000 BTU.

Additional features of this model include: a multi-speed blower, heavy insulated steel cabinets, an aluminized steel primary heat exchanger and a stainless steel secondary heat exchanger. The system also offers the option of using 100 percent outside air for combustion to help increase the unit’s longevity.

Furnace Filters for the American Standard Freedom 90

Air Flow ConfigurationCabinet WidthFilters
Upflow / Horizontal17-1/2″1 17x25x1
(bottom air return)
1 17x25x1
(side air return)
Upflow / Horizontal21″1 20x25x1
(bottom air return)
1 20x25x1
(side air return)
Upflow / Horizontal24-1/2″1 24x25x1
(bottom air return)
1 24x25x1
(side air return)
Downflow / HorizontalAll2 16x20x1

Questions about this model?

Consumer Reviews of American Standard Freedom 90


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #2 of 7 American Standard Furnace
  • 30% of customers recommended

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American Standard Freedom 90 Furnace Reviews

Showing 6-10 of 10 reviews

"American Standard 96% high efficient furnace"

5.0 rating
Very Satisfied

I installed an American Standard two stages variable speed furnace in May 2006. It has been a reliable and efficient unit in the six years it has been in operation in my home. The furnace motor is very quiet and the heat distribute very evenly to my house. It solves some of my cold spots that I have on my old furnace.

Calgary AB

"All models are Trane"

1.0 rating
Very Unsatisfied

We install all units — but, I can’t recommend any Trane systems with all the problems we come accross in the field. A lot of the systems have break downs within the first 5 years. 3 out of 5 systems for some reason have restrictions found.

Boyds Maryland

"60,000btu 92% Efficient"

1.0 rating
Very Unsatisfied

Combustion fumes blowing into heated space. Contractor has been here twice and has not solved the problem. I paid $2100.00 and since installation I have had problems and if not for space heaters, would not had heat. Today is Feb. 22 and the job was finished on 6Feb. Need help on solving problem.


"I would buy a vent-less gas heater for back up"

3.0 rating

Personally if you have natural gas available I would buy a vent-less gas heater for back up. These units do not need electric for the flame so if you lose power you will still have heat and you can buy a new one for a couple hundred bucks.


"American Standard Freedom 90: Reliable and Efficient"

5.0 rating
Very Satisfied

I installed an American Standard Freedom 90 Single Stage gas forced air furnace along with the American Standard Allegiance 11 central air conditioner in May 2003. It has been a reliable and efficient unit in the eight years it has been in operation in my home. The furnace offers 92% efficiency and heats a 1080 square foot, 3 bedroom 1955-built ranch house in Duluth, Minnesota for under $200 per month even in the middle of winter. The first year after, I saw a 39% reduction in my gas bill from the winter before, so it’s an ideal choice to upgrade if you have an older furnace. The coil for the Allegiance 11 central air unit fits in the plenum above the Freedom 90 furnace; with the entire system mated to a programmable thermostat, it is easy to switch from heating in winter to cooling in summer. Operation is quiet. The only drawback is the filter; it takes a 14×25 filter, which does not seem to be a common, easy to find size. In eight years, it has been very reliable. I have had only one service call, when it was six years old at the beginning of the 2009-10 heating season, to replace the valve that opens when it starts to allow gas to come from the gas supply into the furnace. The repair was done by a local contractor that specializes in the American Standard brand and was fixed right the first time. The American Standard brand is one I’d buy again, and I have recommended it to friends. It has offered nearly flawless operation and saved me a significant amount of money over the last eight years.

Duluth, MN

Other Freedom 90 Reviews

The Freedom 90 receives mixed reviews around the web. Many consumers on and post troubleshooting issues, but none complain about the quality of the unit. System malfunctions and blower issues are among the issues reported.

Reviews on are likewise mixed; some reviewers suggest that this furnace is a good option for consumers in a mild climate, but others report inconsistent heating performance as a result of the furnace’s single-stage heating. also notes the warranty for the Freedom 90 may not be as comprehensive as other brands.

Questions and Answers


What does the red blinking light on my furnace mean?


A steady blinking red light on an American Standard Freedom 90 means there is a call for heat from the thermostat. This is normal and means the unit is performing as it should. If the red lights come in a series of blinks and pauses, this is an error code and is a way to diagnose a problem with the furnace. On the inside of your unit’s front panel there should be a chart of diagnostic codes and their meanings.


How do you reset the open high limit switch?


On 2013-02-10 JB wrote:

You can find good information for how to find and reset it as well as a photo of what it looks like here and here.

It is highly recommended that if you do not have experience working on furnaces that you bring in a certified HVAC tech. This work can be dangerous and make the problem worse. An HVAC tech will be able to make the repair quickly and easily.


Where do I find the tag on an American Standard Freedom 90 Horizontal Furnace? I’m looking for the serial number, but can’t find the tag.


On 2014-12-10 Danielle wrote:

I believe the tag for the American Standard Freedom 90 should be either on the sides of the interior sheet metal housing or on the shelf below the burners.

American Standard Freedom 90 Model Numbers

The Freedom 90 is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
ADC040C924B* 91 40,000
ADC060C936B* 91 60,000
ADC080C942B* 91 80,000
ADC100C948B* 91 100,000
ADC120C960B* 91 120,000
ADC1B040A9241A* 91 40,000
ADC1B060A9361A* 91 60,000
ADC1B080A9421A* 91 80,000
ADC1C100A9481A* 91 100,000
ADC1D120A9601A* 91 120,000
AUC040C924B* 92.1 40,000
AUC060C936B* 92.1 60,000
AUC080C942B* 92.1 80,000
AUC100C948B* 92.1 100,000
AUC100C960B* 92.1 100,000
AUC120C960B* 92.1 120,000
AUC1B040A9241A* 92.1 40,000
AUC1B060A9361A* 92.1 60,000
AUC1B080A9421A* 92.1 80,000
AUC1C100A9481A* 92.1 100,000
AUC1D100A9601A* 92.1 100,000
AUC1D120A9601A* 92.1 120,000

Freedom 90 Warranty

Homeowners must register their furnace within 60 days of installation to receive a lifetime limited warranty on the heat exchanger and a 5-year limited warranty on internal parts. Optional extended warranties are available. Failure to register the product will result in base warranty coverage. Products can be registered online at or by calling 800-554-8005.

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