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Actual product may vary from photos.
The USA Made by Leading Manufacturer AHYF8S120CU5 (Item No. 604597) has been discontinued.
Please call us for a suitable alternate product.

(800) 865-5931

Monday - Friday

8:30 AM - 5:00 PM Central

This USA Made AHYF8S120CU5 has some cosmetic damage incurred during shipping. For detailed photos please click 'See Additional Images' above. This USA Made AHYF8S120CU5 meets the full manufacturer's specifications, comes with the full manufacturer's warranty, and includes Alpine's premium guarantee.

For product specs and photographs of product in its original condition, click here.


When the unforgiving winter season bears down, your family deserves a furnace that provides reliable, absolute warmth and comfort. That's why the AHYF8S mid-efficiency gas furnace is engineered with robust components, providing energy savings even during the months of heavy use. The AHYF8S offers value and performance that will put your mind at ease.

Each blower wheel is individually balanced to each furnace, and whisper-quiet burners all contribute to quiet operation and consistent comfort. Also contributing to the quiet operation is the premium insulation in each AHYF8S furnace.

These furnaces normally sell for twice as much. Now due to a manufactuer overstock sale, we are able to provide you with this outstanding low price! Hurry, limited supplies, order today.

Standard Features

  • 80% AFUE efficiency
  • Multi-speed blower motor
  • Heavy-guage, pre-painted cabinet provides corrosion protection
  • Time delay / off for AC SEER enhancement
  • Electronic air cleaner, humidifier, and continuous fan connections
  • Downflow applications
  • Troubleshooting is fast and accurate with onboard diagnostics
  • Integrated furnace control with diagnostics and 115V hot surface ignitor system
  • Run-tested at the factory to ensure reliable performance
  • Vertical or horizontal venting 
  • Five amp fused low voltage circuit protection
  • Certified to ANSI and CSA standards

Note: Due to this being an overstock product, Alpine does not carry all of the manufacturer-specific accessories. Please click the Accessories tab above to see what is available; products not listed in the Accessories tab may be sourced through a local distributor.


Configuration is the direction the conditioned air will pass through the unit.

Upflow units will have the air come in from the bottom and blow out the top.

Horizontal units will have the air go through the unit left to right, or right to left.

Downflow units will have the air come in from the top of the unit, and blow out the bottom.

Unsure of what configuration your home needs? Call us at 800-865-5931. Monday through Friday, 8:30am to 5:00pm CST

Blower Cooling Capacity

The tonnage of air conditioning that can be moved effectively by the blower. You want to make sure that the blower is appropriately sized for the air conditioner. If it is too small the coil could ice up. If it is too large than the air coming out of the ducts won't be cold enough.

Blower Cooling Capacity
5 Tons
Minimum Input BTU

The amount of heat produced by the unit at the lower stage of heat. Having two stages of heat will allow for more consistent operation and greater comfort in the home.

Minimum Input BTU
78,000 BTU
Minimum Output BTU

The amount of heat delivered into the space on the lower stage of heat. This number is the minimum heat input minus the efficiency loss.

Minimum Output BTU
64,000 BTU
Maximum CFM

The maximum amount of air that the blower can push. Rated in Cubic feet per minute or CFM.

Maximum CFM
2,190 @ 0.5
Efficiency (% AFUE)

The percentage of energy converted into output by the unit. The remaining percentage is lost during the conversion process. The higher the efficiency, the lower the operational cost.

Efficiency (% AFUE)
80 %
Maximum Overcurrent Protection (Breaker)

The maximum capacity breaker in the building's circuit panel that can be used on the dedicated electrical line supplying the equipment.

Maximum Overcurrent Protection (Breaker)
20 Amps
Supply Air Opening Size

The dimensions of the opening that the air is discharged through. This is the section where you would attach the supply plenum.

Supply Air Opening Size
20 x 19.75 Inches
Product Weight
150 lbs
Meets CSA Standards

Canadian Standards Association

Meets CSA Standards
Meets Canadian OEE Standards

Standards established by Canada's Office of Energy Efficiency.

Meets Canadian OEE Standards
California Approved

LoNox feature meets State of California emissions requirements.

California Approved
21 Inches
28 1/2 Inches
40 Inches
Heat Exchanger Warranty
1 Year
Parts Warranty
1 Years

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.