Independent Review · Updated June 2026

3.5 Ton 15 SEER 98% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow

High-efficiency Goodman system balances solid performance with practical value for residential upgrades.

8.2
IndustrialRank Score
Efficiency
8.5
Reliability
7.8
Value
8.0
Installation
8.5
Warranty
8.0
3.5 Ton 15 SEER 98% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow
Current Price
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// Bottom Line
This 3.5 ton Goodman system works best for homeowners replacing older equipment in moderate climates who want ENERGY STAR efficiency without premium pricing. The modulating gas furnace and variable-speed blower deliver comfort and lower utility bills, making it ideal for families looking to upgrade their HVAC without overspending.

Review

The Goodman gas furnace and air conditioner system delivers reliable performance for residential applications at a competitive price point. This upflow A-coil configuration suits homes with basement mechanical rooms or downflow installations requiring horizontal orientation. Goodman's market reputation centers on practical engineering rather than luxury features, making this system a smart choice for budget-conscious homeowners and contractors who prioritize value and availability over cutting-edge technology.

Performance numbers justify the ENERGY STAR label. The furnace achieves 97% AFUE with modulating burners that scale output based on heating demand, delivering 80,000 BTU of heat while minimizing gas consumption. Cooling efficiency reaches SEER1 16, though the single-stage scroll compressor cannot modulate capacity for part-load efficiency during mild spring and fall conditions. The variable-speed ECM blower reaches 1600 CFM maximum airflow, adapting motor speed to maintain consistent comfort while reducing noise and energy draw.

Pros & Cons

Pros

  • 97% AFUE furnace efficiency with modulating burner stages reduces gas waste and heating costs
  • SEER1 16 air conditioning efficiency exceeds the 15 SEER rating listed in product title
  • Variable-speed ECM blower motor optimizes airflow at 1600 CFM maximum, improving comfort and reducing noise
  • Scroll compressor design proven for durability and quiet operation at 73 dB
  • Plastic/PVC exhaust flue compatibility simplifies venting and reduces installation costs

Cons

  • Single-stage condenser limits part-load efficiency during mild weather cooling cycles
  • Specifications show 5 ton cooling capacity but product marketed as 3.5 ton, creating confusion about actual system size
  • R410A or R22 refrigerant compatibility suggests older design; newer systems standardize on single refrigerant types
  • 73 dB noise level ranks as moderately loud compared to high-efficiency variable-speed compressor systems

Who Should Buy

Best For

Homeowners in moderate climate zones who need to replace a failed HVAC system and want certified ENERGY STAR equipment with solid reliability. Contractors building affordable, efficient rental properties or spec homes will appreciate the straightforward installation and reasonable part availability through Online Supply.

Consider Alternatives If

Those in extreme climate zones needing maximum cooling capacity, noise-sensitive applications, or buyers seeking the absolute lowest operating costs should compare two-stage or variable-speed compressor systems instead.

3.5 Ton 15 SEER 98% AFUE 80,000 BTU Goodman Gas Fu
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Installation

Installation requires standard refrigerant line sizing with 3/8 inch liquid lines and 1 1/8 inch suction lines, both insulated at 1/2 inch thickness. Electrical connections use 115V single-phase 60 Hz power with breaker sizing between 23.5 and 40 amps. PVC exhaust venting simplifies gas furnace installation compared to older metal flue systems. Typical contractor installation time runs 4 to 6 hours for experienced technicians.

Warranty & Reliability

Goodman provides 10 years of parts and labor coverage when registered online after installation. This warranty ranks above industry standard 5-year coverage and protects against compressor failure, heat exchanger defects, and component failures. Registration is mandatory to activate the full 10-year term, so buyers should complete this step immediately upon system startup.

Specifications

SKULS381183850
Brand/ManufacturerOnline Supply
Cooling BTU42,000
Heating BTU80,000
RefrigerantR410A or R22
Electrical115 V. 1 Phase 60 Hz
Warranty10 Years with Online Registration
Decibel Level (dBA)73
Weight (in lbs)48.000000
FeatureSpec
Energy StarYes
SEER1 (Efficiency)16
Condenser StagesSingle Stage
Compressor TypeScroll
Liquid Valve Size3/8"
Suction Valve Size7/8"
Max Breaker Size40 amps
Min. Breaker Size23.5 amps
Tonnage5 Ton
Height34.5"
Width21"
Depth28.75"
ResourcesGoodman Brochure Goodman Installations Instructions Goodman Parts Manual Goodman Service Manual Goodman Specifications Goodman Technical Information Goodman User Information Goodman Warranty You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
ConfigurationUpflow/Horizontal
Liquid Line3/8"
Suction Line1 1/8"
StyleA-Coil
AHRI Certificate Number7424266
Airflow DirectionUpflow/Horizontal
Exhaust Flue RequirementPlastic / PVC
Furnace Efficiency / AFUE97%
Blower MotorVariable Speed - ECM
Maximum CFM1600
Burner StagesModulating
Fuel TypePropane, Natural Gas
Suction Line Insulation Thickness1/2"
Length50 feet

Frequently Asked Questions

Why does the product title say 3.5 ton but the specifications show 5 ton capacity? +
The cooling capacity specs list 42,000 BTU (3.5 ton) for the air conditioner, but the system tonnage field shows 5 ton, likely indicating furnace input rating. Confirm actual cooling capacity with your dealer before purchase, as this discrepancy could indicate a data entry error affecting your cooling needs assessment.
Can this furnace run on both propane and natural gas? +
Yes. The specifications confirm propane and natural gas fuel compatibility. However, you must configure the burner assembly for your specific fuel type during installation. Converting between fuels requires a certified technician, replacement of burner components, and factory recalibration, making fuel switching impractical after initial setup.
How much will this system reduce my energy bills compared to a standard 13 SEER unit? +
The 97% AFUE furnace uses approximately 3 to 5 percent less natural gas than an 95% AFUE system, saving roughly 100 to 200 dollars annually depending on heating degree days. The SEER1 16 air conditioner saves 20 to 25 percent cooling costs versus a 13 SEER unit, potentially reducing summer electricity use by 300 to 600 dollars.
Should I choose this Goodman over a higher-priced Lennox or Carrier system? +
Goodman offers comparable reliability and efficiency at 20 to 30 percent lower cost. Premium brands provide quieter compressors, variable-speed cooling, and extended warranties. Buy Goodman if reliability and budget matter most. Choose premium brands if noise sensitivity or extreme climate demands justify higher investment.
What happens to my warranty if I install this system myself? +
Goodman requires professional installation for warranty validity. DIY installation voids all coverage, including the 10-year parts protection. Always hire a licensed HVAC contractor to protect your investment and ensure safe, code-compliant operation of gas heating equipment.

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