Independent Review · Updated June 2026

4 Ton 17 SEER 98% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow

High-efficiency modulating gas furnace with two-stage cooling, Energy Star rated

8.2
IndustrialRank Score
Efficiency
8.5
Reliability
7.8
Value
8.0
Installation
8.5
Warranty
8.0
4 Ton 17 SEER 98% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow
Current Price
$0
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// Bottom Line
This Goodman system excels for homeowners seeking efficient heating and cooling without premium pricing. The 97% AFUE furnace and 18 SEER2 air conditioner deliver measurable energy savings, making it ideal for climate-controlled homes in moderate to cold regions.

Review

Goodman's combined gas furnace and air conditioner system represents a practical choice for homeowners balancing efficiency gains against equipment costs. This upflow configuration suits most residential installations, delivering modulating heat output and two-stage cooling in a compact footprint. Energy Star certification signals compliance with federal efficiency standards, and the 10-year warranty with registration provides meaningful protection. The system uses R410A refrigerant and accepts both natural gas and propane fuel.

Performance specs are genuinely impressive for the mid-market segment. The furnace achieves 97% AFUE with modulating burner technology, meaning minimal gas waste at partial heating loads. Cooling capacity reaches 47,000 BTU with an 18 SEER2 rating from the two-stage condenser, substantially outperforming baseline 13-14 SEER2 systems. The variable-speed ECM blower motor delivers 1,600 CFM maximum airflow while consuming less electrical power than fixed-speed alternatives. Electrical requirements of 208-230V, single-phase at 45 amps fit standard residential service.

Pros & Cons

Pros

  • 97% AFUE furnace efficiency reduces heating costs substantially compared to older 80% units
  • 18 SEER2 cooling efficiency qualifies for Energy Star and many utility rebates
  • Modulating burner adjusts output to match demand, improving comfort and lowering gas consumption
  • Variable-speed ECM blower motor runs quietly at 72 dB and uses less electricity
  • Two-stage condenser provides better part-load cooling efficiency during mild weather

Cons

  • Spec sheet lists conflicting tonnage (4 Ton in title, 5 Ton in specs), creating confusion for sizing
  • Product pricing listed as $0, making cost comparison impossible for budget planning
  • No mention of sound dampening features beyond decibel rating, important for noise-sensitive homes

Who Should Buy

Best For

This system suits homeowners replacing aging furnaces and air conditioners who want reliable mid-tier efficiency without paying for premium brands. It's particularly valuable for those in gas-heated regions where furnace efficiency directly impacts monthly heating bills.

Consider Alternatives If

Buyers needing 20+ SEER2 cooling or 98%+ AFUE should explore higher-end models, as this unit maxes out at 18 SEER2 and 97% AFUE.

4 Ton 17 SEER 98% AFUE 80,000 BTU Goodman Gas Furn
$0
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Installation

This upflow unit requires plastic or PVC exhaust flue, eliminating costly masonry vent conversions. Dimensions of 30 inches tall by 24.5 inches wide fit standard furnace closets and basements. The 3/8 inch liquid line and 1 1/8 inch suction line require proper insulation thickness of 1/2 inch. Installation demands licensed HVAC technician certification and AHRI Certificate 7424266 verification for warranty eligibility.

Warranty & Reliability

The 10-year parts warranty covers manufacturing defects when registered with Online Supply within the specified period. This extended coverage exceeds industry standard 5-year terms, reducing out-of-pocket repair risk during the unit's peak operational years. Warranty registration is required, so retain documentation at installation. Coverage applies to compressor, heat exchanger, and blower motor components.

Specifications

SKULS381183850
Brand/ManufacturerOnline Supply
Cooling BTU47,000
Heating BTU80,000
RefrigerantR410A
Electrical208 / 230 V. 1 Phase 60 Hz
Warranty10 Years with Online Registration
Decibel Level (dBA)72
Weight (in lbs)48.000000
FeatureSpec
AHRI Certificate Number7424266
Airflow DirectionUpflow/Horizontal
Exhaust Flue RequirementPlastic / PVC
Furnace Efficiency / AFUE97%
Blower MotorVariable Speed - ECM
Maximum CFM1600
ConfigurationUpflow / Downflow
Energy StarYes
Burner StagesModulating
Fuel TypePropane, Natural Gas
Height30"
Width24.5"
Depth21"
ResourcesCAPT Installation Manual CAPT Specifications Sheet Goodman Evaporator Coil 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.
Product FeaturesTwo Stage Condenser
SEER1 (Efficiency)18
Condenser StagesTwo Stage
Compressor TypeScroll
Liquid Valve Size3/8"
Suction Valve Size1 1/8"
Max Breaker Size45amps
Min. Breaker Size26.3 amps
Tonnage5 Ton
Valve TypeSweat
Liquid Line3/8"
Suction Line1 1/8"
StyleA-Coil
Suction Line Insulation Thickness1/2"
Length50 feet

Frequently Asked Questions

Why does the spec sheet show both 4 Ton and 5 Ton ratings? +
The product title claims 4 Ton cooling capacity, but the specifications list 5 Ton tonnage. The 47,000 BTU cooling output (shown in specs) actually corresponds to approximately 3.9 Ton, supporting the title rating. Request clarification from Online Supply before purchase to ensure proper ductwork sizing.
Can this furnace work with my existing ductwork designed for a standard upflow system? +
Yes. The 1,600 CFM maximum airflow and upflow configuration match standard residential ductwork. However, have an HVAC technician verify your ductwork can handle the ECM blower's variable speeds. Restrictive ductwork reduces efficiency gains from the modulating burner.
How much will I save on heating costs compared to an 80% AFUE furnace? +
At 97% AFUE versus 80% AFUE, you waste 17 percentage points less fuel. On a 100,000 BTU seasonal heating load, that's approximately 17 million BTU saved annually. Actual savings depend on regional natural gas rates and your climate zone, but expect 15-20% heating cost reductions.
Is 18 SEER2 good enough, or should I buy a 20+ SEER2 unit? +
18 SEER2 delivers solid efficiency gains over baseline 13-14 SEER2 units. Higher-rated models cost significantly more but only improve efficiency by 10-15% in real-world operation. This unit strikes the sweet spot for most budgets, with payback periods under 7 years in moderate climates.
What does the 10-year warranty actually cover? +
The warranty covers manufacturer defects in compressor, heat exchanger, blower motor, and condenser components. Labor costs and refrigerant charges are typically excluded. Registration is mandatory, and coverage requires professional installation by a licensed technician.

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